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Cucurbita
Cucurbita species come in a variety of colors and sizes
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Rosids
Order:
Cucurbitales
Family:
Cucurbitaceae
Subfamily:
Cucurbitoideae
Tribe:
Cucurbiteae
Genus:
Cucurbita

Species

see below

Synonyms

Cucurbita (Latin for gourd)[1] is a genus in the gourd family Cucurbitaceae native to and originally cultivated in the Andes and Mesoamerica. Some Cucurbita species were brought to Europe after the discovery of America and are now used in many parts of the world. The plants, referred to as squash, pumpkin or gourd depending on species, variety and local parlance, are grown for their edible fruits and seeds. There are five domesticated species: Cucurbita argyrosperma, C. ficifolia, C. maxima, C. moschata, and C. pepo. C. pepo includes varieties of both winter squash and summer squash, and C. moschata may be used as winter squash because the full-grown fruits can be stored for months.

Real (bottle-)gourds, used as utensils or vessels, belong to the genus Lagenaria in the gourd family and are native to Africa. Lagenaria are in the same family and subfamily as Cucurbita, but different tribes. Many North and Central American species are visited by specialist pollinators in the apid group. There is no universal agreement on how to handle the taxonomic treatment of the genus, with the number of species being listed varying from 13–30. There is uncertainty as to the ancestors of some species. Most species are vines, grow several meters in length, and have yellow or orange flowers. The Cucurbita genus is an important source of human food and is used for other purposes such as beverages, medicine, oil, and detergent.

Description

Most Cucurbita species, are climbing annual (mesophytes) vines while the perennials (xerophytes) grow in tropical zones. The plant stem can grow 5 to 15 metres (16 to 49 ft) and produces tendrils that help it climb adjacent plants and structures or along the ground. Most species do not readily root from the leaf axils; Cucurbita ficifolia is a notable exception. The vine of the Cucurbita can become semiwoody if left to grow. There is a wide variety in size, shape, and color among Cucurbita, even within single species. C. ficifolia is an exception to this, being highly uniform in appearance.[2] The morphological differences in the species C. pepo are so vast that its various subspecies and cultivars have been misidentified as totally separate species.[3]

The typical cultivated Cucurbita species has five-lobed or palmately divided (radiating from the base) leaves having long petioles; with the leaves alternately arranged on the stem. Tendrils are spring-like. It has male (staminate) and female (pistillate) flowers (unisexual flowers) on a single plant (monoicous). Flowers have five fused petals and five stamens (male) or an inferior ovary (female). Fruits are large and fleshy, usually with a pepo (a modified berry with a hard outer rind). Seeds are attached to the ovary wall (parietal placentation) and not to the center. Seeds are large and fairly flat in an embryo which has two rather large cotyledons.[4] Wild fruit specimens can be as small as 4 centimetres (1.6 in). Certain domesticated specimens can weigh well over 300 kilograms (660 lb).[5] The current world record was set by Ron Wallace of Greene, Rhode Island with a 911.2 kilograms (2,009 lb) Atlantic Giant pumpkin.[6]

Botanists classify the Cucurbita fruit as a pepo, which is a special type of berry with a thick outer wall or rind formed from hypanthium tissue fused to the exocarp. The fleshy interior is composed of mesocarp and endocarp. The pepo, derived from an inferior ovary, is characteristic of the squash family (Cucurbitaceae). "Pepo" is a specialized term used primarily for Cucurbitaceae fruits, which are modified to have a hard outer rind. While pepos are most common in the Cucurbitaceae, the fruits of Passiflora and Carica are sometimes considered pepos.[7][8][9] Many North and Central American species are visited by specialist pollinators in the apid group Eucerini, especially the genera Peponapis and Xenoglossa, and these squash bees can be crucial to the flowers producing fruit after pollination.[2][10] Competitively grown specimens are often hand-pollinated, requiring proper technique.[11] Parthenocarpy is known to occur in certain cultivars of C. pepo.[12][13]

History and domestication

Cucurbita pepo subsp. texana, from Les Grandes Heures d'Anne de Bretagne, 1503–1508, f. 161, earliest depiction of Cucurbits in Europe

Cucurbita are native to the New World since the early development of agriculture, possibly being in the New World prior to the arrival of humans. The likely center of origin is southern Mexico and then spreading south into South America, largely what is now known as Mesoamerica, and north to what is now the southwestern United States.[14] The ancestral species of the genus were present in the Americas before the arrival of humans. Evolutionarily speaking the genus is relatively recent in origin as no species within the genus is genetically isolated from all the other species. Cucurbita moschata acts as the genetic bridge within the genus.[15] The genus was part of the culture of almost every native peoples group from southern South America to southern Canada.[16] Species native to North America include C. digitata (calabazilla),[17] and C. foetidissima (buffalo gourd),[18] C. palmata (coyote melon), and C. pepo.[2] Modern-day cultivated Cucurbita are not found in the wild.[2] Every species of Cucurbita has 20 pairs of chromosomes.[19] Genetic studies of the mitochondrial gene nad1 show there were at least six independent domestication events of Cucurbita separating domestic species from their wild ancestors.[20] Some species, such as C. digitata and C. ficifolia, are referred to as gourds, but the real (bottle-)gourds, used as utensils or vessels, belong to the genus Lagenaria in the gourd family and are native to Africa. Lagenaria are in the same family and subfamily as Cucurbita, but different tribes.[21]

The earliest known evidence of the domestication of Cucurbita dates back 8,000–10,000 years ago, predating the domestication of other crops such as maize and beans in the region by about 4,000 years.[22] This evidence was found in the Guilá Naquitz cave in Oaxaca, Mexico, during a series of excavations in the 1960s and 1970s, possibly beginning in 1959.[23][24] Subsequent more accurate dating using accelerator mass spectrometers provided more specific dates. Solid evidence of domesticated Cucurbita pepo was found in the Guilá Naquitz cave in the form of increasing rind thickness and larger peduncles in the newer stratification layers of the cave. By circa 8,000 years BP the C. pepo peduncles found are consistently more than 10 mm (0.39 in) thick. Wild Cucurbita peduncles are always below this 10 mm barrier. Changes in fruit shape and color indicate intentional breeding of C. pepo occurred by no later than 8,000 years BP.[4][25][26] During the same time frame, average rind thickness increased from 0.84 mm (0.033 in) to 1.15 mm (0.045 in).[27]

Moche Squash Ceramic. 300 A.D. Larco Museum

The process of domesticating the squashes took place over 5,000–6,500 years in Mesoamerica. Squash was domesticated first, followed by maize and then beans, becoming part of the Three Sisters agricultural system of companion planting.[28][29] All three crops have been frequently depicted in the art work of the native peoples of the Americas for at least 2,000 years.[30][31] For example, squashes are represented frequently in Moche ceramics.[30][32]

The English word "squash" derives from askutasquash (a green thing eaten raw), a word from the Narragansett language, which was documented by Roger Williams, the founder of Rhode Island, in his 1643 publication A Key Into the Language of America.[33] Similar words for squash exist in related languages of the Algonquian family.[34][35]

Cucurbita began to spread to other parts of the world after Christopher Columbus's arrival in the New World in 1492.[36][37] Until 1992, the earliest known depictions of this genus in Europe was of Cucurbita pepo in De Historia Stirpium Commentarii Insignes in 1542 by Leonhart Fuchs, a German botanist. In 1992, two paintings, one of C. pepo and one of C. maxima, were found in a festoon at Villa Farnesina in Rome.[38] These were painted between 1515 and 1518. In 2001 depictions of this genus were found in Grandes Heures of Anne of Brittany (Les Grandes Heures d'Anne de Bretagne), a French devotional book printed between 1503 and 1508. This book contains an illustration known as Quegourdes de turquie, which was identified by cucurbit specialists as C. pepo subsp. texana in 2006.[39]

Species

A variety of C. maxima and C. pepo

Curcurbita was formally described in 1753 in Linnaeus's famous Species Plantarum, which established botanical nomenclature as it exists today. Curcurbita pepo is the type species of the genus.[40][41] The Curcurbita digitata, C. foetidissima, C. galeotti, and C. pedatifolia species groups are xerophytes, arid zone perennials with storage roots; the remainder, including the five domesticated species, are all mesophytic, which are annuals or short-life perennials with no storage roots.[2][15] The five domesticated species are mostly isolated by sterility barriers and have different physiological characteristics.[15] Some cross pollinations can occur: C. pepo with C. argyrosperma and C. moschata; and C. maxima with C. moschata. Cross pollination does occur readily within the family Cucurbitaceae.[42] The buffalo gourd (C. foetidissima), which does not taste good, has been used as an intermediary as it can cross breed with all the common Cucurbita.[4]

Cucurbita flower with pollinating insect (bee)

Various taxonomic treatments have been proposed for Cucurbita, ranging from 13–30 species.[1] In 1990 botanist Michael Nee classified them into the following 13 species groups (27 species total), listed by group and alphabetically, with geographic origin:[2][43][44]

The taxonomy by Nee closely matches the species groupings reported in a pair of studies by a botanical team led by Rhodes and Bemis in 1968 and 1970 based on statistical groupings of several phenotypic traits of 21 species. Seeds for studying additional species members were not available. Sixteen of the 21 species were grouped into five clusters with the remaining five being classified separately:[19][47]

  • C. digitata, C. palmata, C. californica, C. cylindrata, C. cordata
  • C. martinezii, C. okeechobeensis, C. lundelliana
  • C. sororia, C. gracilior, C. palmeri; C. argyrosperma (reported as C. mixta) was considered close to the three previous species
  • C. maxima, C. andreana
  • C. pepo, C. texana
  • C. moschata, C. ficifolia, C. pedatifolia, C. foetidissima, and C. ecuadorensis were placed in their own four separate groups as they were not considered significantly close to any of the other species studied.

Habitat and distribution

A festival-winning 742 kilograms (1,636 lb) pumpkin in 2009

Of the five domesticated species, four of them: Cucurbita argyrosperma, C. ficifolia, C. moschata, and C. pepo originated and were domesticated in Mesoamerica; whereas in the case of C. maxima these occurred in South America. The exact location of origin of C. ficifolia and C. moschata is less certain.[5] Within C. pepo, the pumpkins, scallops, and possibly crooknecks are ancient and were domesticated separately. The domesticated species have larger fruits and larger yet fewer seeds.[35] In a 1989 study on the origins and development of C. pepo, Paris suggested that the original wild specimen was a small round fruit and that the modern pumpkin is its direct descendant. He suggested that the crookneck, ornamental gourd, and scallop are early variants and that the acorn is a cross between the scallop and pumpkin.[35]

Cucurbita argyrosperma is not as widespread as the other species but is found from Mexico to Nicaragua. It has large seeds that are high in oil and protein and was likely bred for its seeds. Its flesh is of poorer quality than that of C. moschata and C. pepo. It is found from sea level to as high as 1,800 metres (5,900 ft) in dry areas or areas with a defined rainy season. Seeds are sown in May–June and fruit harvested from October–December.[5]

Cucurbita ficifolia and C. moschata were originally thought to be Asiatic in origin, but this has been disproven. The origin of C. ficifolia is Latin America, most likely southern Mexico, Central America, or the Andes. It grows at altitudes from 1,000 metres (3,300 ft) to 3,000 metres (9,800 ft) in areas with heavy rainfall. It does not hybridize well with the other cultivated species as it has significantly different enzymes and chromosomes. It is apparently pollinated by a different bee.[5]

Cucurbita maxima originated in South America over 4,000 years ago,[20] most likely Argentina and Uruguay. They are sensitive to frost, prefer sunlight, and thrive in soil with a pH of 6.0 to 7.0.[48] It did not start to spread into North America until after the arrival of Columbus. By the 16th century varieties were in use by native peoples of the United States.[2] Groups of C. maxima include Triloba,[49] Zapallito,[50] Zipinka,[51] Banana, Delicious, Hubbard, Marrow (C. maxima Marrow), Show, and Turban.[52]

C. moschata 'Butternut'

Cucurbita moschata is native to Latin America but the precise location of origin is uncertain.[53] It has been present in Mexico, Belize, Guatemala, and Peru for 4,000–6,000 years and has spread to Bolivia, Ecuador, Panama, Puerto Rico, and Venezuela. This species is closely related to C. argyrosperma. A variety known as the Seminole Pumpkin has been cultivated in Florida since before the arrival of Columbus. Its leaves are 20 to 30 centimetres (7.9 to 11.8 in) wide. It generally grows at low altitudes in hot climates with heavy rainfall, but some varieties have been found above 2,200 metres (7,200 ft).[5] Groups of C. moschata include: Cheese, Crookneck (C. moschata), and Bell.[52]

Cucurbita pepo is one of the oldest, if not the oldest domesticated species with the oldest known locations being Oaxaca, Mexico 8,000–10,000 years ago and Ocampo, Tamaulipas, Mexico about 7,000 years ago. It is known to have appeared in Missouri, United States at least 4,000 years ago.[5] Debates about the origin of C. pepo have been going on since at least 1857.[54] There have traditionally been two opposing theories about its origin: 1) that it is a direct descendant of C. texana and 2) that C. texana is merely feral C. pepo.[2] A more recent theory by botanist Andres in 1987 is that it is a descendant of C. fraterna and hybridized with C. texana;[55] resulting in two distinct domestication events in two different areas: one in Mexico and one in the eastern United States, with C. fraterna and C. texana, respectively, as the ancestral species.[5][20][55][56] C. pepo may have appeared in the Old World prior to moving from Mexico into South America.[5] It is found from sea level to slightly above 2,000 metres (6,600 ft). Leaves have 3–5 lobes and are 20–35 cm wide. All the subspecies, varieties, and cultivars are conspecific and interfertile.[3] In 1986 botanist Paris proposed a taxonomy of C. pepo consisting of eight edible groups based on their basic shape.[35][57] All but a few C. pepo can be included in these groups.[57] These eight edible cultivated varieties of C. pepo vary widely in shape and color,[5][58][59] and one non-edible cultivated variety:[60]

Cultivar group Botanical name Image Description
Acorn C. pepo var. turbinata winter squash, both a shrubby and creeping plant, obovoid or conical shape, pointed at the apex and with longitudinal grooves, thus resembling a spinning top,[57] ex: Acorn squash[5][58][59]
Cocozzelle C. pepo var. Ionga summer squash, long round slender fruit that is slightly bulbous at the apex,[57] similar to fastigata, ex: Cocozelle von tripolis[5][58][59]
Crookneck C. pepo var. torticollia (also torticollis) summer squash, shrubby plant, with yellow, golden, or white fruit which is long and curved at the end and generally has a verrucose (wart-covered) rind,[57] ex: Yellow crookneck squash[5][58][59]
Pumpkin C. pepo var. pepo
winter squash, creeping plant, round, oblate, or oval shape and round or flat on the ends,[57] ex: Pumpkin;[5][58][59] includes C. pepo subsp. pepo var. styriaca, used for Styrian pumpkin seed oil[61]
Scallop C. pepo var. clypeata; called C. melopepo by Linnaeus[3] summer squash, prefers half-shrubby habitat, flattened or slightly discoidal shape, with undulations or equatorial edges,[57] ex: Pattypan squash[5][58][59]
Straightneck C. pepo var. recticollis summer squash, shrubby plant, with yellow or golden fruit and verrucose rind, similar to var. torticollia but a stem end that narrows,[57] ex: Yellow summer squash[5][58][59]
Vegetable marrow C. pepo var. fastigata summer and winter squashes, creeper traits and a semi-shrub, cream to dark green color, short round fruit with a slightly broad apex,[57] ex: Spaghetti squash (a winter variety)[5][58][59]
Zucchini C. pepo var. cylindrica summer squash, presently the most common group of cultivars, origin is recent (19th century), semi-shrubby, cylindrical fruit with a mostly consistent diameter,[57] similar to fastigata, ex: Zucchini[5][58][59]
Ornamental gourds C. pepo var. ovifera non-edible,[60] field pumpkins closely related to C. texana, vine habitat, thin stems, small leaves, three sub-groups: C. pepo var. ovifera (egg-shaped, pear-shaped), C. pepo var. aurantia (orange color), and C. pepo var. verrucosa (round warty gourds), ornamental gourds found in Texas and called var. texana and ornamental gourds found outside of Texas (Illinois, Missouri, Arkansas, Oklahoma, and Louisiana) are called var. ozarkana.[62]

Culinary uses

Pumpkin custard made from kabocha, a cultivated variant of C. maxima

The species of Cucurbita are prepared and consumed in many ways. While the skins are often bitter, the fruits and seeds of cultivated varieties are quite edible by humans with little or no preparation. The seeds and fruits of most varieties can be stored for long periods of time.[2] In addition, the young leaves, young shoot tips, and flowers can be consumed.[63] The Cucurbitaceae family has the largest number of different species used as human food than any other plant family.[5] Cucurbita is one of the most important of those, either for their fruit or the seeds within. The winter varieties have thick, inedible skins, and so store well. They have a sweet taste. In contrast, summer squash have a thin, edible skin. The seeds of both types can be ground into a flour or meal,[64] roasted, eaten raw, made into pumpkin seed oil,[61] or otherwise prepared. Buffalo gourd oil is made from Cucurbita foetidissima.[65] By the time of European contact Cucurbita had long been a major food source for the native peoples of the Americas. They became an important food for the European settlers, including the Pilgrims, for whom they were a major part of the first Thanksgiving.[4] The large red-orange squashes often seen at Halloween in the United States are C. maxima, but not to be confused with the orange type used for jack-o-lanterns, which are C. pepo.[2] Commercially made pumpkin pie mix is most often made from varieties of C. moschata; 'Libby's Select' uses the Select Dickinson Pumpkin variety of C. moschata for its canned pumpkins.[66] Other foods that can be made using members of this genus include biscuits, bread, cheesecake, desserts, donuts, granola, ice cream, lasagna dishes, pancakes, pudding, salads, soups, and stuffing.[67] The species that are xerophytes are proving useful in the search for nutritious foods that grow well in arid regions.[68]

Medicinal uses

Cucurbita is used in cosmetics for dry and sensitive skin and in treating schistosomiasis.[69][70][71] The flesh of Cucurbita argyrosperma is used for treating burns and skin conditions while its seeds are treated with water and used as an anesthetic and to promote lactation in nursing women.[5] C. ficifolia is used to make flavorings for soft and mildly alcoholic drinks[5] and high doses of C. ficifolia have been shown to be successful in reducing blood sugar levels.[1] The fruits of some species, such as C. foetidissima, are used as soaps and detergents.[1][65] Cucurbita fruits are an important source for humans of carotenoids, vitamin A, and rhodopsin, all of which are important to good visual acuity.[4][72] Cucurbitin is an amino acid and a carboxypyrrolidine found in Cucurbita seeds that can eliminate parasitic worms.[73][74]

Nutrients

Summer squash, all varieties, raw
Nutritional value per 100 g (3.5 oz)
Energy69 kJ (16 kcal)
3.4 g
Sugars2.2 g
Dietary fiber1.1 g
0.2 g
1.2 g
Vitamins and minerals
VitaminsQuantity
%DV†
Vitamin A equiv.
1%
10 μg
1%
120 μg
2125 μg
Thiamine (B1)
4%
0.048 mg
Riboflavin (B2)
11%
0.142 mg
Niacin (B3)
3%
0.487 mg
Pantothenic acid (B5)
3%
0.155 mg
Vitamin B6
13%
0.218 mg
Folate (B9)
7%
29 μg
Vitamin C
19%
17 mg
Vitamin K
3%
3 μg
MineralsQuantity
%DV†
Iron
2%
0.35 mg
Magnesium
4%
17 mg
Manganese
8%
0.175 mg
Phosphorus
3%
38 mg
Potassium
9%
262 mg
Zinc
3%
0.29 mg
Other constituentsQuantity
Water95 g
Link to USDA Database entry, for comparison, see values for raw pumpkin
†Percentages estimated using US recommendations for adults,[75] except for potassium, which is estimated based on expert recommendation from the National Academies.[76]

Cucurbita have phytochemical constituents such as alkaloids, flavonoids, and palmitic, plus oleic and linoleic acids. Pumpkins have anti-diabetic, antioxidant, anticarcinogen, and anti-inflammatory pharmacological properties include.[77] Pumpkins and pumpkin seeds have high levels of crude protein, calcium, iron, potassium, phosphorus, magnesium, zinc,[78][79] and beta-carotene.[80] Squashes are good sources of vitamin A, vitamin C, potassium, dietary fiber, niacin, folic acid, and iron. They are free of fat and cholesterol.[81]

Toxins

Cucurmosin is a ribosome inactivating protein found in the sarcocarp (flesh) and seed of Cucurbita,[82][83] notably Cucurbita moschata. Cucurmosin is toxic to cancer cells.[82]

Cucurbitacin is a plant steroid poisonous to mammals found in wild Cucurbita in quantities sufficient to discourage herbivores.[84] It has been bred out of cultivated varieties. It has a bitter taste and ingesting too much can cause stomach cramps, diarrhea and even collapse.[85] While the process of domestication has largely removed the bitterness from the cultivated varieties,[1] there are occasional reports of cucurbitacin getting into the human food supply and causing illnesses.[1] This is what makes wild Cucurbita and most ornamental gourds, with the exception of an occasional C. fraterna and C. sororia, bitter to taste.[1][55]

Pests and diseases

Cucurbita species are used as food plants by the larvae of some Lepidoptera species, including Cabbage Moths, Hypercompe indecisa, and Turnip Moths.[73] Cucurbita can be susceptible to the pest Bemisia argentifolii (silverleaf whitefly)[86] as well as aphids (Aphididae), cucumber beetles (Acalymma vittatum and Diabrotica undecimpunctata howardi), squash bug (Anasa tristis), the squash vine borer (Melittia cucurbitae), and the twospotted spidermite (Tetranychus urticae).[87] The squash bug causes major damage to plants because of its very toxic saliva.[88] Cucurbits are susceptible to diseases such as bacterial wilt (Erwinia tracheiphila), anthracnose (Colletotrichum spp.), fusarium wilt (Fusarium spp.), phytophthora blight (Phytophthora spp. water molds), and powdery mildew (Erysiphe spp.).[87] Defensive responses to viral, fungal, and bacterial leaf pathogens do not involve cucurbitacin.[84]

Species in the genus Cucurbita are susceptible to some types of mosaic virus including: Cucumber mosaic virus (CMV), Papaya ringspot virus-cucurbit strain (PRSV), Squash mosaic virus (SqMV), Tobacco ringspot virus (TRSV),[89] Watermelon mosaic virus (WMV), and Zucchini yellow mosaic virus (ZYMV).[90][91][92][93] PRSV is the only one of these viruses that does not affect all cucurbits, which is the family Cucurbitaceae.[90][94] SqMV and CMV are the most common viruses among cucurbits.[95][96] Symptoms of these viruses show a high degree of similarity and laboratory investigation is often needed to differentiate which one is affecting plants.[89]

Production

Squashes are primarily grown for the fresh food market.[97] The Food and Agriculture Organization of the United Nations (FAO) reported that the ranking of the top five squash-producing countries was stable from 2005–2009. Those countries are: China, India, Russia, United States, and Egypt. By 2012, Iran had moved into the 5th slot, with Egypt falling to the 6th slot. The top 10 countries in terms of metric tonnes of squashes produced are:[98]

Top ten squash producers — 2012[98]
Country Production (metric tonnes) Source
China China 6,140,840 FAO figure
India India 4,424,200 FAO figure
Russia Russia 988,180 FAO figure
United States USA 778,630 FAO figure
Iran Iran 695,600 FAO figure
Egypt Egypt 658,234 FAO figure
Mexico Mexico 522,388 FAO figure
Ukraine Ukraine 516,900 FAO figure
Italy Italy 508,075 FAO figure
Turkey Turkey 430,402 FAO figure
 Top 10 total 15,663,449 aggregate

The only other countries that rank in the top 20 where squashes are native are Cuba, which ranks 14th with 347,082 metric tonnes, and Argentina, which ranks 17th, with 326,900 metric tonnes.[98] In addition to being the 4th largest producer of squashes in the world, the United States is the world's largest importer of squashes, importing 271,614 metric tonnes in 2011, 95% of that from Mexico. Within the United States, the states producing the largest amounts are: Florida, New York, California, and North Carolina.[97]

See also

References

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  6. ^ Marturana, Amy. "Ron Wallace Grows The Largest Pumpkin, Breaking World Record". Huffington Post. Retrieved October 29, 2013.
  7. ^ "A Systematic Treatment of Fruit Types". Worldbotanical. Retrieved October 10, 2013.
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  9. ^ Schrager, Victor (2004). The Compleat Squash: A Passionate Grower's Guide to Pumpkins, Squash, and Gourds. New York: Artisan. p. 25. ISBN 978-1-579-65251-7.
  10. ^ Attention: This template ({{cite jstor}}) is deprecated. To cite the publication identified by jstor:2406514, please use {{cite journal}} with |jstor=2406514 instead.
  11. ^ Stephenson, Andrew G.; Devlin, B.; Horton, J. Brian (1988). "The Effects of Seed Number and Prior Fruit Dominance on the Pattern of Fruit Production in Cucurbits pepo (Zucchini Squash)". Annals of Botany. 62 (6). Oxford Journals: 653–661.
  12. ^ Robinson, R. W.; Reiners, Stephen (1999). "Parthenocarpy in Summer Squash" (PDF). HortScience. 34 (4): 715–717. {{cite journal}}: Unknown parameter |month= ignored (help)
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