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Seeds of ''Crepis'' species are an important food source for some bird species.<ref>{{cite journal |journal=Animal Science |year=2005 |volume=81 |pages=199–203 |title=The influence of livestock management on habitat quality for farmland birds |author=D. L. Buckingham and W. J. Peach |issue=2 |url=http://www.bsas.org.uk/Publications/Animal_Science/text/Volume_81_Part_2/199/ |doi=10.1079/asc50700199}}{{dead link|date=August 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
Seeds of ''Crepis'' species are an important food source for some bird species.<ref>{{cite journal |journal=Animal Science |year=2005 |volume=81 |pages=199–203 |title=The influence of livestock management on habitat quality for farmland birds |author=D. L. Buckingham and W. J. Peach |issue=2 |url=http://www.bsas.org.uk/Publications/Animal_Science/text/Volume_81_Part_2/199/ |doi=10.1079/asc50700199}}{{dead link|date=August 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>

== Reproduction ==
''Crepis'' can reproduce sexually or [[Asexual reproduction|asexually]]. ''Crepis'' is [[Entomophily|insect-pollinated]], typically by [[Bee|bees]] and other generalist pollinators.<ref>{{Cite journal |last=Cheptou |first=P.‐O. |last2=Lepart |first2=J. |last3=Escarre |first3=J. |date=2002-08-21 |title=Mating system variation along a successional gradient in the allogamous and colonizing plant Crepis sancta (Asteraceae) |url=https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1420-9101.2002.00443.x |journal=Journal of Evolutionary Biology |language=en |volume=15 |issue=5 |pages=753–762 |doi=10.1046/j.1420-9101.2002.00443.x |issn=1010-061X}}</ref> Species in this genus are able to produce viable seeds through [[Hybrid (biology)|hybridization]]. Some of these hybrids (depending on their parent species) can reproduce themselves.<ref name=":0">{{Citation |last=Babcock |first=Ernest B. |title=Cytogenetics and Speciation in Crepis |date=1947 |url=http://dx.doi.org/10.1016/s0065-2660(08)60483-6 |work=Advances in Genetics |pages=69–93 |access-date=2023-03-21 |publisher=Elsevier}}</ref> As an aster, flowers of ''Crepis'' are closely clustered on a [[Pseudanthium|capitulum]], which is surrounded by petal-like [[Ray (botany)|rays]]. Asexual reproduction (or [[autogamy]]) between flowers on the same capitulum has been observed in the genus.<ref>{{Cite journal |last=Cheptou |first=P.O. |last2=Lepart |first2=J. |last3=Escarre |first3=J. |date=2001-01-01 |title=Differential outcrossing rates in dispersing and non-dispersing achenes in the heterocarpic plant Crepis sancta (Asteraceae) |url=http://dx.doi.org/10.1023/a:1011961905525 |journal=Evolutionary Ecology |volume=15 |issue=1 |pages=1–13 |doi=10.1023/a:1011961905525 |issn=0269-7653}}</ref>

=== Apomixis in ''Crepis'' ===
As with several other genera in [[Asteraceae]], multiple ''Crepis'' species exhibit [[apomixis]], a form of asexual reproduction where flowers produce clonal seeds without need of fertilization.<ref name=":1">{{Cite journal |last=Hörandl |first=E. |last2=Hojsgaard |first2=D. |date=2012-09-01 |title=The evolution of apomixis in angiosperms: A reappraisal |url=https://www.tandfonline.com/doi/abs/10.1080/11263504.2012.716795 |journal=Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology |volume=146 |issue=3 |pages=681–693 |doi=10.1080/11263504.2012.716795 |issn=1126-3504}}</ref> Unlike sexually-reproducing individuals, which are [[diploid]], apomicts are typically [[Polyploidy|polyploid]], with three or more sets of chromosomes.<ref name=":3">{{Cite journal |last=Whitton |first=Jeannette |last2=Sears |first2=Christopher J. |last3=Maddison |first3=Wayne P. |date=2017-12-06 |title=Co-occurrence of related asexual, but not sexual, lineages suggests that reproductive interference limits coexistence |url=https://royalsocietypublishing.org/doi/10.1098/rspb.2017.1579 |journal=Proceedings of the Royal Society B: Biological Sciences |language=en |volume=284 |issue=1868 |pages=20171579 |doi=10.1098/rspb.2017.1579 |issn=0962-8452 |pmc=PMC5740271 |pmid=29212720}}</ref> The mechanism of apomixis in ''Crepis'' is apospory, wherein diploid tissue arises during [[meiosis]] in the [[ovule]]. Through apospory, asexual seeds can develop spontaneously in the flowers of a non-apomictic ''Crepis''.<ref>{{Cite journal |last=Stebbins |first=G. L. |last2=Jenkins |first2=J. A. |date=1939-05-01 |title=Aposporic development in the North American species of Crepis |url=https://doi.org/10.1007/BF01508152 |journal=Genetica |language=en |volume=21 |issue=3 |pages=191–224 |doi=10.1007/BF01508152 |issn=1573-6857}}</ref>

''Crepis'' is part of the [[Cichorieae]] tribe in Asteraceae, and is one of several genera of that tribe that exhibits apomixis.<ref>{{Cite journal |last=Fehrer |first=Judith |last2=Bertrand |first2=Yann J. K. |last3=Hartmann |first3=Matthias |last4=Caklová |first4=Petra |last5=Josefiová |first5=Jiřina |last6=Bräutigam |first6=Siegfried |last7=Chrtek |first7=Jindřich |date=2022-09-30 |title=A Multigene Phylogeny of Native American Hawkweeds (Hieracium Subgen. Chionoracium, Cichorieae, Asteraceae): Origin, Speciation Patterns, and Migration Routes |url=https://www.mdpi.com/2223-7747/11/19/2584 |journal=Plants |language=en |volume=11 |issue=19 |pages=2584 |doi=10.3390/plants11192584 |issn=2223-7747 |pmc=PMC9571344 |pmid=36235450}}</ref><ref>{{Cite journal |last=Rousi |first=Arne |date=1973 |title=Studies on the cytotaxonomy and mode of reproduction of Leontodon (Compositae) |url=https://www.jstor.org/stable/23725033 |journal=Annales Botanici Fennici |volume=10 |issue=3 |pages=201–215 |issn=0003-3847}}</ref><ref>{{Cite journal |last=MOGIE |first=MICHAEL |last2=FORD |first2=HENRY |date=1988-10-01 |title=Sexual and asexual Taraxacum species |url=http://dx.doi.org/10.1111/j.1095-8312.1988.tb00463.x |journal=Biological Journal of the Linnean Society |volume=35 |issue=2 |pages=155–168 |doi=10.1111/j.1095-8312.1988.tb00463.x |issn=0024-4066}}</ref> The largest group of asexual species is found in [[North America]], and is referred to as the "North American ''Crepis'' agamic complex"<ref name=":1" /><ref name=":3" /> The agamic complex may have first arisen in the [[Pliocene]], between 5.3 to 2.6 million years ago.<ref>{{Cite book |last=Babcock, E.B., Stebbins, G.L. |first= |title=The American Species of Crepis; Their Interrelationships and Distribution as Affected by Polyploidy and Apomixis |publisher=Carnegie Institution of Washington Publication |year=1938 |language=English}}</ref> At least one Eurasian ''Crepis'' species, ''C. tectorum'', has been observed to self-fertilize.<ref name=":0" /> Another agamic complex is thought to exist in Asia.<ref>{{Cite journal |last=Andersson |first=Stefan |date=1989-09-01 |title=The evolution of self-fertility inCrepis tectorum (Asteraceae) |url=https://doi.org/10.1007/BF00936101 |journal=Plant Systematics and Evolution |language=en |volume=168 |issue=3 |pages=227–236 |doi=10.1007/BF00936101 |issn=1615-6110}}</ref> Species known to produce apomicts in''clude C.'' ''acuminata, C.'' ''barbigera, C. intermedia,'' and ''C. occidentalis.'' Polyploid individuals may still be able to carry out sexual reproduction and therefore produce sexual offspring, allowing for the formation of new polyploid hybrids.<ref name=":0" />

=== Reproductive interference ===
Apomictic individuals can prevent reproduction in sexual individuals in multiple ways. Like other apomictic species in Cichorieae, polyploid apomicts may still produce viable pollen that can be transferred to sexual diploids through the normal process of pollination.<ref>{{Cite journal |last=Meirmans |first=P. G. |last2=Den Nijs |first2=H. (j) C. M. |last3=Van Tienderen |first3=P. H. |date=2006-01-01 |title=Male sterility in triploid dandelions: asexual females vs asexual hermaphrodites |url=https://www.nature.com/articles/6800750 |journal=Heredity |language=en |volume=96 |issue=1 |pages=45–52 |doi=10.1038/sj.hdy.6800750 |issn=1365-2540}}</ref> The mixed apomict-sexual parantage may produce a polyploid hybrid (as has been observed when the apomictic ''C. barbigera'' breeds with diploid species ''C. atribarba''<ref name=":2">{{Cite journal |last=Hersh |first=Evan |last2=Grimm |first2=Jaime |last3=Whitton |first3=Jeannette |date=2016-09-01 |title=Attack of the clones: reproductive interference between sexuals and asexuals in the Crepis agamic complex |url=https://onlinelibrary.wiley.com/doi/10.1002/ece3.2353 |journal=Ecology and Evolution |language=en |volume=6 |issue=18 |pages=6473–6483 |doi=10.1002/ece3.2353 |issn=2045-7758 |pmc=PMC5058521 |pmid=27777723}}</ref>). Seed set in the diploid may be reduced, or the pollen may produce hybrid seeds that are unable to reproduce or survive to a normal lifespan.<ref>{{Cite journal |last=Andersson |first=Stefan |date=1993-03-01 |title=Morphometric differentiation, patterns of interfertility, and the genetic basis of character evolution inCrepis tectorum (Asteraceae) |url=https://doi.org/10.1007/BF00937777 |journal=Plant Systematics and Evolution |language=en |volume=184 |issue=1 |pages=27–40 |doi=10.1007/BF00937777 |issn=1615-6110}}</ref> The pollen from the apomict may also prevent germination of pollen from a diploid flower. When pollen from a polyploid individual fertilizes diploid flowers, the resultant seeds are typically polyploid, which lowers the diploid population over generations.<ref name=":3" />

As a result of this reproductive interference, sexual reproduction between diploid plants is reduced when apomicts enter a population. Because diploid species require pollen exchange to reproduce and apomicts can produce seeds by [[parthenogenesis]], apomicts do not suffer any reproductive consequences in a mixed diploid-polyploid population. Meanwhile, the reproductive success of sexually-reproducing diploids falls, resulting in diploids being found more often in populations isolated from apomicts.<ref name=":3" />

=== Evolutionary implications ===
Although apomixis has been considered a "blind alley of evolution", research into apomictic species and species complexes has cast doubt on this. Apomictic clades elsewhere in Cichorieae have demonstrated an ability to "revert" to a sexual mode of reproduction, reducing the risk of extinction through lack of [[introgression]].<ref name=":1" /> Speciation in ''Crepis'' has occurred through its ability to self-fertilize, hybridize, and form polyploid apomicts.<ref name=":0" />

Apomixis can facilitate range expansion in ways that sexual reproduction does not. Apomicts do not require input of genetic material for another individual, and can therefore produce seeds on maturity without the aid of pollinators. This allows apomictic populations to expand into new geographic areas more rapidly than sexual ones. Because apomixis in ''Crepis'' involves multiple ploidy levels, there is sufficient genetic variation for adaptation to novel ecosystems.<ref>{{Citation |last=Hojsgaard |first=Diego |title=Apomixis as a Facilitator of Range Expansion and Diversification in Plants |date=2015 |url=http://dx.doi.org/10.1007/978-3-319-19932-0_16 |work=Evolutionary Biology: Biodiversification from Genotype to Phenotype |pages=305–327 |access-date=2023-03-09 |place=Cham |publisher=Springer International Publishing |isbn=978-3-319-19931-3 |last2=Hörandl |first2=Elvira}}</ref> Additionally, some ''Crepis'' apomict species have the ability to hybridize with other apomicts, resulting in genetic recombination alongside [[parthenogenesis]].<ref>{{Cite journal |last=Whitton |first=Jeannette |last2=Dlugosch |first2=Katrina M. |last3=Sears |first3=Christopher J. |date=2008-08-01 |title=Molecular and morphological evidence for and against gene flow in sympatric apomicts of the North American Crepis agamic complex (Asteraceae) |url=http://www.nrcresearchpress.com/doi/10.1139/B08-071 |journal=Botany |language=en |volume=86 |issue=8 |pages=877–885 |doi=10.1139/B08-071 |issn=1916-2790}}</ref>


==Uses==
==Uses==

Revision as of 21:14, 25 April 2023

This article is about the genus of plant. For the bryozoan genus, see Crepis (bryozoan).

Crepis
Crepis jacquinii
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Cichorioideae
Tribe: Cichorieae
Subtribe: Crepidinae
Genus: Crepis
L.
Species

about 200, see text

Crepis, commonly known in some parts of the world as hawksbeard or hawk's-beard (but not to be confused with the related genus Hieracium with a similar common name), is a genus of annual and perennial flowering plants of the family Asteraceae superficially resembling the dandelion, the most conspicuous difference being that Crepis usually has branching scapes with multiple heads (though solitary heads can occur). The genus name Crepis derives from the Greek krepis, meaning "slipper" or "sandal", possibly in reference to the shape of the fruit.[1]

The genus is distributed throughout the Northern Hemisphere and Africa,[2] and several plants are known as introduced species practically worldwide.[1] The center of diversity is in the Mediterranean.[2]

Ecology

Crepis species are used as food plants by the larvae of some Lepidoptera species including the broad-barred white moth. The fly Tephritis formosa is known to attack the capitula of this plant.[3]

Seeds of Crepis species are an important food source for some bird species.[4]

Reproduction

Crepis can reproduce sexually or asexually. Crepis is insect-pollinated, typically by bees and other generalist pollinators.[5] Species in this genus are able to produce viable seeds through hybridization. Some of these hybrids (depending on their parent species) can reproduce themselves.[6] As an aster, flowers of Crepis are closely clustered on a capitulum, which is surrounded by petal-like rays. Asexual reproduction (or autogamy) between flowers on the same capitulum has been observed in the genus.[7]

Apomixis in Crepis

As with several other genera in Asteraceae, multiple Crepis species exhibit apomixis, a form of asexual reproduction where flowers produce clonal seeds without need of fertilization.[8] Unlike sexually-reproducing individuals, which are diploid, apomicts are typically polyploid, with three or more sets of chromosomes.[9] The mechanism of apomixis in Crepis is apospory, wherein diploid tissue arises during meiosis in the ovule. Through apospory, asexual seeds can develop spontaneously in the flowers of a non-apomictic Crepis.[10]

Crepis is part of the Cichorieae tribe in Asteraceae, and is one of several genera of that tribe that exhibits apomixis.[11][12][13] The largest group of asexual species is found in North America, and is referred to as the "North American Crepis agamic complex"[8][9] The agamic complex may have first arisen in the Pliocene, between 5.3 to 2.6 million years ago.[14] At least one Eurasian Crepis species, C. tectorum, has been observed to self-fertilize.[6] Another agamic complex is thought to exist in Asia.[15] Species known to produce apomicts include C. acuminata, C. barbigera, C. intermedia, and C. occidentalis. Polyploid individuals may still be able to carry out sexual reproduction and therefore produce sexual offspring, allowing for the formation of new polyploid hybrids.[6]

Reproductive interference

Apomictic individuals can prevent reproduction in sexual individuals in multiple ways. Like other apomictic species in Cichorieae, polyploid apomicts may still produce viable pollen that can be transferred to sexual diploids through the normal process of pollination.[16] The mixed apomict-sexual parantage may produce a polyploid hybrid (as has been observed when the apomictic C. barbigera breeds with diploid species C. atribarba[17]). Seed set in the diploid may be reduced, or the pollen may produce hybrid seeds that are unable to reproduce or survive to a normal lifespan.[18] The pollen from the apomict may also prevent germination of pollen from a diploid flower. When pollen from a polyploid individual fertilizes diploid flowers, the resultant seeds are typically polyploid, which lowers the diploid population over generations.[9]

As a result of this reproductive interference, sexual reproduction between diploid plants is reduced when apomicts enter a population. Because diploid species require pollen exchange to reproduce and apomicts can produce seeds by parthenogenesis, apomicts do not suffer any reproductive consequences in a mixed diploid-polyploid population. Meanwhile, the reproductive success of sexually-reproducing diploids falls, resulting in diploids being found more often in populations isolated from apomicts.[9]

Evolutionary implications

Although apomixis has been considered a "blind alley of evolution", research into apomictic species and species complexes has cast doubt on this. Apomictic clades elsewhere in Cichorieae have demonstrated an ability to "revert" to a sexual mode of reproduction, reducing the risk of extinction through lack of introgression.[8] Speciation in Crepis has occurred through its ability to self-fertilize, hybridize, and form polyploid apomicts.[6]

Apomixis can facilitate range expansion in ways that sexual reproduction does not. Apomicts do not require input of genetic material for another individual, and can therefore produce seeds on maturity without the aid of pollinators. This allows apomictic populations to expand into new geographic areas more rapidly than sexual ones. Because apomixis in Crepis involves multiple ploidy levels, there is sufficient genetic variation for adaptation to novel ecosystems.[19] Additionally, some Crepis apomict species have the ability to hybridize with other apomicts, resulting in genetic recombination alongside parthenogenesis.[20]

Uses

In Crete, Greece the leaves of Crepis commutata which are called glykosyrida (γλυκοσυρίδα) are eaten raw, boiled, steamed or browned in salads. Another two species on the same island, Crepis vesicaria, called kokkinogoula (κοκκινογούλα), lekanida (λεκανίδα) or prikousa (πρικούσα) and a local variety called maryies (μαργιές) or pikrouses (πικρούσες) have both its leaves and tender shoots eaten boiled by the locals.[citation needed]

Secondary metabolites

The genus Crepis is a rich source of costus lactone-type guaianolides,[21] a class of sesquiterpene lactones.

Phenolics found in Crepis include luteolin-type flavonoids and caffeoyl quinic acid derivatives such as chlorogenic acid and 3,5-dicaffeoylquinic acid. Moreover, Crepis species contain the caffeoyl tartaric acid derivatives caffeoyl tartaric acid and cichoric acid.[22]

Diversity

Main article: List of Crepis species

There are about 200 species in the genus.[1][2]

Crepis tectorum
Crepis pyrenaica
Crepis aurea
Crepis flowers attracts bumblebees

Species include:

References

  1. ^ a b c Crepis. Flora of North America.
  2. ^ a b c Enke N., Gemeinholzer B. (2008). "Babcock revisited: New insights into generic delimitation and character evolution in Crepis L. (Compositae: Cichorieae) from ITS and matK sequence data". Taxon. 57 (3): 756–68. doi:10.1002/tax.573008.
  3. ^ White, I.M. (1984). Tephritid Flies (Diptera: Tephritidea). Handbooks for the Identification of British Insects. Vol. 10 pt 5a. Royal Entomological Society of London. pp. 134 pp. ISBN 0901546682.
  4. ^ D. L. Buckingham and W. J. Peach (2005). "The influence of livestock management on habitat quality for farmland birds". Animal Science. 81 (2): 199–203. doi:10.1079/asc50700199.[permanent dead link]
  5. ^ Cheptou, P.‐O.; Lepart, J.; Escarre, J. (2002-08-21). "Mating system variation along a successional gradient in the allogamous and colonizing plant Crepis sancta (Asteraceae)". Journal of Evolutionary Biology. 15 (5): 753–762. doi:10.1046/j.1420-9101.2002.00443.x. ISSN 1010-061X.
  6. ^ a b c d Babcock, Ernest B. (1947), "Cytogenetics and Speciation in Crepis", Advances in Genetics, Elsevier, pp. 69–93, retrieved 2023-03-21
  7. ^ Cheptou, P.O.; Lepart, J.; Escarre, J. (2001-01-01). "Differential outcrossing rates in dispersing and non-dispersing achenes in the heterocarpic plant Crepis sancta (Asteraceae)". Evolutionary Ecology. 15 (1): 1–13. doi:10.1023/a:1011961905525. ISSN 0269-7653.
  8. ^ a b c Hörandl, E.; Hojsgaard, D. (2012-09-01). "The evolution of apomixis in angiosperms: A reappraisal". Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology. 146 (3): 681–693. doi:10.1080/11263504.2012.716795. ISSN 1126-3504.
  9. ^ a b c d Whitton, Jeannette; Sears, Christopher J.; Maddison, Wayne P. (2017-12-06). "Co-occurrence of related asexual, but not sexual, lineages suggests that reproductive interference limits coexistence". Proceedings of the Royal Society B: Biological Sciences. 284 (1868): 20171579. doi:10.1098/rspb.2017.1579. ISSN 0962-8452. PMC 5740271. PMID 29212720.{{cite journal}}: CS1 maint: PMC format (link)
  10. ^ Stebbins, G. L.; Jenkins, J. A. (1939-05-01). "Aposporic development in the North American species of Crepis". Genetica. 21 (3): 191–224. doi:10.1007/BF01508152. ISSN 1573-6857.
  11. ^ Fehrer, Judith; Bertrand, Yann J. K.; Hartmann, Matthias; Caklová, Petra; Josefiová, Jiřina; Bräutigam, Siegfried; Chrtek, Jindřich (2022-09-30). "A Multigene Phylogeny of Native American Hawkweeds (Hieracium Subgen. Chionoracium, Cichorieae, Asteraceae): Origin, Speciation Patterns, and Migration Routes". Plants. 11 (19): 2584. doi:10.3390/plants11192584. ISSN 2223-7747. PMC 9571344. PMID 36235450.{{cite journal}}: CS1 maint: PMC format (link) CS1 maint: unflagged free DOI (link)
  12. ^ Rousi, Arne (1973). "Studies on the cytotaxonomy and mode of reproduction of Leontodon (Compositae)". Annales Botanici Fennici. 10 (3): 201–215. ISSN 0003-3847.
  13. ^ MOGIE, MICHAEL; FORD, HENRY (1988-10-01). "Sexual and asexual Taraxacum species". Biological Journal of the Linnean Society. 35 (2): 155–168. doi:10.1111/j.1095-8312.1988.tb00463.x. ISSN 0024-4066.
  14. ^ Babcock, E.B., Stebbins, G.L. (1938). The American Species of Crepis; Their Interrelationships and Distribution as Affected by Polyploidy and Apomixis. Carnegie Institution of Washington Publication.{{cite book}}: CS1 maint: multiple names: authors list (link)
  15. ^ Andersson, Stefan (1989-09-01). "The evolution of self-fertility inCrepis tectorum (Asteraceae)". Plant Systematics and Evolution. 168 (3): 227–236. doi:10.1007/BF00936101. ISSN 1615-6110.
  16. ^ Meirmans, P. G.; Den Nijs, H. (j) C. M.; Van Tienderen, P. H. (2006-01-01). "Male sterility in triploid dandelions: asexual females vs asexual hermaphrodites". Heredity. 96 (1): 45–52. doi:10.1038/sj.hdy.6800750. ISSN 1365-2540.
  17. ^ Hersh, Evan; Grimm, Jaime; Whitton, Jeannette (2016-09-01). "Attack of the clones: reproductive interference between sexuals and asexuals in the Crepis agamic complex". Ecology and Evolution. 6 (18): 6473–6483. doi:10.1002/ece3.2353. ISSN 2045-7758. PMC 5058521. PMID 27777723.{{cite journal}}: CS1 maint: PMC format (link)
  18. ^ Andersson, Stefan (1993-03-01). "Morphometric differentiation, patterns of interfertility, and the genetic basis of character evolution inCrepis tectorum (Asteraceae)". Plant Systematics and Evolution. 184 (1): 27–40. doi:10.1007/BF00937777. ISSN 1615-6110.
  19. ^ Hojsgaard, Diego; Hörandl, Elvira (2015), "Apomixis as a Facilitator of Range Expansion and Diversification in Plants", Evolutionary Biology: Biodiversification from Genotype to Phenotype, Cham: Springer International Publishing, pp. 305–327, ISBN 978-3-319-19931-3, retrieved 2023-03-09
  20. ^ Whitton, Jeannette; Dlugosch, Katrina M.; Sears, Christopher J. (2008-08-01). "Molecular and morphological evidence for and against gene flow in sympatric apomicts of the North American Crepis agamic complex (Asteraceae)". Botany. 86 (8): 877–885. doi:10.1139/B08-071. ISSN 1916-2790.
  21. ^ Zidorn, C. (2008). "Sesquiterpene lactones and their precursors as chemosystematic markers in the tribe Cichorieae of the Asteraceae". Phytochemistry. 69 (12): 2270–2296. doi:10.1016/j.phytochem.2008.06.013. ISSN 0031-9422. PMID 18715600.
  22. ^ Zidorn, C.; et al. (2008). "Phenolics as chemosystematic markers in and for the genus Crepis (Asteraceae, Cichorieae)". Scientia Pharmaceutica (Vienna, Austria). 76 (4): 743–50. doi:10.3797/scipharm.0810-25. ISSN 0036-8709.
  23. ^ "Crepis palaestina (Boiss.) Bornm. | Plants of the World Online | Kew Science".
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