|Annona squamosa fruit|
The Annonaceae are a family of flowering plants consisting of trees, shrubs, or rarely lianas commonly known as the custard apple family or soursop family. With 108 accepted genera and about 2400 known species, it is the largest family in the Magnoliales. Several genera produce edible fruit, most notably Annona, Anonidium, Asimina, Rollinia, and Uvaria. Its type genus is Annona. The family is concentrated in the tropics, with few species found in temperate regions. About 900 species are Neotropical, 450 are Afrotropical, and the remaining are Indomalayan.
- Stems, stalks and leaves
- Bark is fibrous and aromatic. Pith septate (fine tangential bands divided by partitions) to diaphragmed (divided by thin partitions with openings in them). Branching distichous (arranged in two rows/on one plane) or spiral. Leaves are alternate, two-ranked, simple, pinnately veined, and have leaf stalks. Stipules absent.
- Flower stalks are axillary to (on the opposite side of shoot from) leaf scars on old wood and sometimes from leaves on new shoots. The flowers are usually trimerous; borne singly or in compound inflorescences; bisexual and rarely unisexual. The receptacle might become enlarged, elevated or flat. The outer whorls are inserted below the ovaries, and have valvate (overlapping) or imbricate (nonoverlapping) segments. Usually two to four persistent sepals that are distinct or connate (fused) at the base. Six petals in two unequal whorls of three with larger outer whorls and fleshier inner whorls that might share the same nectar glands, or six to fifteen petals, with impressed veins on their inner face. Ten to twenty (or many more) stamens inserted below the ovary, spirally arranged and forming a ball or flat-topped mass with short and stout filaments and linear to oblong anthers which face outward and open longitudinally. Each flower can have from one to many pistils, distinct to connate, with stigmas distinct. Marginal placentation, each pistil bearing one locule, with one to many ovules. Style short and thick, with terminal stigma.
- Fruits and seeds
- Fruits are single berries or coalesce from several pistils (into aggregate fruit, syncarps). Seeds are one to many per pistil; have a fleshy and usually brightly colored cover, have ruminate endosperm (nutritive tissue surrounding the embryo) and are oily.
Monophyly and inter-familial systematics have been well supported for Annonaceae by a combination of morphological and molecular evidence. The APG II system places Annonaceae as most closely related to the small Magnoliid family Eupomatiaceae.
In a phylogeny-based reclassification of the family four subfamilies are recognised: Anaxagoreoideae (including just Anaxagorea), Ambavioideae, Annonoideae, and Malmeoideae. A number of the larger genera, including Guatteria, with its 177 species, Annona, and Xylopia belong to Annonoideae. Together, Annonoideae and Malmeoideae comprise the majority of the species and each are further subdivided into a number of tribes. The subfamilial and tribal classification is followed in World Annonaceae which presents an overview of all Annonaceae genera and taxonomic, distribution and photographic information for a large number of species. Keys for the identification of Annonaceae genera (separately for Neotropical, African/Madagascan, and Asian/Australian taxa) are presented in . For a concise bibliographic overview of the taxonomic literature (1900 to 2012) see.
Both plastid DNA markers and morphological characters provide evidence that Anaxagorea is the sister clade to the rest of the family. This may confirm the hypothesis that morphological traits shared between Anaxagorea and other Magnoliales species (such as 2-ranked phyllotaxis, monosulcate pollen, and laminate stamens) represent ancestral characters, while derived characters observed in other genera have evolved independently multiple times. The oldest fossil evidence of Annonaceae is described as the genus Futabanthus, from the late Cretaceous of Japan, which represents a minimum age of c. 89 Mya for the most recent common ancestor (crown group) of the family. The ages of Annonaceae clades inferred using fossil evidence and molecular clock based dating techniques suggests that the pantropical distribution of the family originated subsequent to the break up of the Gondwanan supercontinent, as the result of a combination of geodispersal tracking the expansion of the boreotropical flora during the Eocene and more recent long distance dispersal events.
- Subfamily Anaxagoreoideae Chatrou et al. 2012
- Anaxagorea St.-Hilaire 1825
- Subfamily Ambavioideae Chatrou et al. 2012
- Subfamily Annonoideae Rafinesque 1815
- Tribe Bocageeae Endlicher 1839
- Tribe Xylopieae Endlicher 1839
- Tribe Duguetieae Chatrou & Saunders 2012
- Tribe Guatterieae Hooker & Thomson 1855
- Tribe Annoneae Endlicher 1839
- Annona L. (Guanabanus Mill., Raimondia Saff., Rollinia A. St.-Hil., Rolliniopsis Saff.)
- Anonidium Engl. & Diels
- Asimina Adans. (Deeringothamnus Small, Orchidocarpum Michx., Pityothamnus Small)
- Diclinanona Diels
- Disepalum Hook. f.
- Goniothalamus (Blume) Hook.f. & Thomson (Richella A.Gray)
- Neostenanthera Exell [Boutiquea Le Thomas]
- Tribe Monodoreae Baill. 1868
- Tribe Uvarieae Hooker & Thomson 1855
- Afroguatteria Boutique
- Cleistochlamys Oliv.
- Dasymaschalon (Hook.f. & Thomson) Dalla Torre & Harms
- Desmos Lour.
- Dielsiothamnus R.E.Fr.
- Fissistigma Griff.
- Friesodielsia Steenis
- Melodorum Lour.
- Mitrella Miq.
- Monanthotaxis Baill. [Gilbertiella Boutique; Exellia Boutique]
- Pyramidanthe Miq.
- Schefferomitra Diels
- Sphaerocoryne (Boerl.) Ridl.
- Toussaintia Boutique
- Uvaria L. (Anomianthus Zoll., Balonga Le Thomas, Cyathostemma Griff., Dasoclema J.Sinclair, Ellipeia Hook.f. & Thomson, Ellipeiopsis R.E.Fr., Rauwenhoffia Scheff., * Xylopiastrum Roberty)
- Subfamily Malmeoideae Chatrou et al. 2012
- Tribe Piptostigmateae Chatrou & Saunders 2012
- Tribe Malmeeae Chatrou & Saunders 2012
- Tribe Maasieae Chatrou & Saunders 2012
- Maasia Mols et al.
- Tribe Fenerivieae Chatrou & Saunders 2012
- Fenerivia Diels
- Tribe Phoenicantheae
- Phoenicanthus Alston
- Tribe Dendrokingstonieae Chatrou & Saunders 2012
- Dendrokingstonia Rauschert
- Tribe Monocarpieae Chatrou & Saunders 2012
- Monocarpia Miq.
- Tribe Miliuseae Hooker & Thomson 1855
- Alphonsea Hook.f. & Thomson
- Desmopsis Saff.
- Huberantha (Hubera Chaowasku)
- Marsypopetalum Scheff.
- Meiogyne Miq. (Ancana F. Mueller; Guamia Merrill; Fitzalania F. Muell.)
- Miliusa Lesch. ex A.DC. (Saccopetalum Bennett)
- Mitrephora (Blume) Hook.f. & Thomson (Kinginda Kuntze)
- Monoon Miq. (Cleistopetalum H. Okada, Enicosanthum Becc., Woodiellantha Rauschert)
- Neo-uvaria Airy Shaw
- ?Oncodostigma Diels
- Orophea (Mezzettiopsis Ridley
- Phaeanthus Hook.f. & Thomson
- Platymitra Boerl.
- Polyalthia Blume (Haplostichanthus F.Muell., Papualthia Diels)
- Popowia Endl.
- Pseuduvaria Miq. (Craibella R.M.K.Saunders et al., Oreomitra Diels, Petalolophus K. Schumann)
- Sageraea Dalzell
- Sapranthus Seem.
- Stelechocarpus Hook. f. & Thomson (kepel)
- Stenanona Standl. (Reedrollinsia J. W. Walker)
- Tridimeris Baill.
- Trivalvaria (Miq.) Miq.
The large, edible, pulpy fruits of some members typically called anona by Spanish- and Portuguese-speaking people of the family's Neotropical range, include species of Annona: custard apple (A. reticulata), cherimoya (A. cherimola), soursop/guanábana/graviola (A. muricata), sweetsop (A. squamosa), ilama (A. diversifolia), soncoya (A. purpurea), atemoya (a cross between A. cherimola and A. squamosa); and biriba (Rollinia deliciosa, which may require reclassification under Annona.). The names of many of those fruits are sometimes used interchangeably. Recently, consumption of the neotropical annonaceous plant Annona muricata (soursop, graviola, guanabana) has been strongly associated as a causal agent in "atypical Parkinsonism". The causative agent, annonacin, is present in many of the Annonaceae. It is thought to be responsible for up to 70% of Parkinsonian conditions in Guadeloupe. Exposure is typically through traditional food and natural medicines.
Flower petals from sacred earflower (Cymbopetalum penduliflorum) and from related species C. costaricense were traditionally used to flavor chocolate before the arrival of cinnamon and the other Old World spices. The dried petals are still used to flavor atoles, pinoles, and coffee.
The compound annonacin in the seeds and leaves of many Annonaceae including soursop (Annona muricata), is a neurotoxin and it seems to be the cause of a neurodegenerative disease. The disorder is a so-called tauopathy associated with a pathologic accumulation of tau protein in the brain. Experimental results demonstrate that the plant neurotoxin annonacin is responsible for this accumulation.
Lancewood (Oxandra lanceolata) is a tough, elastic, and heavy wood obtained from the West Indies and The Guianas. It was often used for carriage shafts. It is brought into commerce in the form of taper poles of about 6 m in length and from 15 to 20 cm in breadth at the butt. The black lancewood or carisiri of The Guianas is of remarkably slender form.
The yellow lancewood tree Calycophyllum candididissimum, common names lemonwood or degame, is from a different family (Rubiaceae). It is used as an alternative to lancewood and is found in tolerable abundance throughout The Guianas, and used by the Amerinds for arrow-points, as well as for spars, beams, etc. Some bowyers use this wood for making longbows.
- Some species of the family, such as Cananga odorata (ylang-ylang) also have aromatic oil and are used for perfumes or spices.
- The strong bark is used for carrying burdens in the Amazon Rainforest and for wooden implements, such as tool handles and pegs. The wood is valued as firewood.
- Yellow and brown dyes
- Some species are also grown as ornamental plants, especially the Indian species Polyalthia longifolia pendula.
- The fruit and leaves of Uvariopsis tripetala (pepperfruit) are used as a spice for meats in some parts of Nigeria, due to its "hot" peppery flavor.
A large number of chemical compounds, including flavonoids, alkaloids, and acetogenins, have been extracted from the seeds and many other parts of these plants. Flavonoids and alkaloids contained in the leaves and bark of several species of the family have shown insecticidal properties.
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Flavoring of drinking chocolate
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