Annonaceae

The Annonaceae are a family of flowering plants consisting of trees, shrubs, or rarely lianas[2] commonly known as the custard apple family[3][2] or soursop family. With 108 accepted genera and about 2400 known species,[4] 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.

Annonaceae
Annona squamosa fruit
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Annonaceae
Juss.
Type genus
Annona
Subfamilies
Synonyms
  • Hornschuchiaceae J. Agardh
  • Monodoraceae J. Agardh[1]

Description
Annona muricata

The species are mostly tropical, some are mid-latitude, deciduous or evergreen trees and shrubs, with some lianas, with aromatic bark, leaves, and flowers.[2]

Stems, stalks and leaves
Bark is fibrous and aromatic. Pith septate (fine tangential bands[5] divided by partitions) to diaphragmed (divided by thin partitions with openings in them).[2] Branching distichous (arranged in two rows/on one plane) or spiral.[6] Leaves are alternate, two-ranked,[6] simple, pinnately veined, and have leaf stalks. Stipules absent.[2]
Flowers
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.[2]
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.[2]

Systematics

Monophyly and inter-familial systematics have been well supported for Annonaceae by a combination of morphological and molecular evidence.[7] The APG II system places Annonaceae as most closely related to the small Magnoliid family Eupomatiaceae.

Uvaria ovata is part of the Family, Annonaceae.
Magnoliidae
 
 

Canellales

 
 

Piperales

 
 
 
 
Magnoliales
 

Myristicaceae

 
 
 

Magnoliaceae

 
 
 
 

Degeneriaceae

 
 

Himantandraceae

 
 
 
 

Eupomatiaceae

 
 

Annonaceae

 
 
 
 
 
 
 

Laurales

 
 
 
Annonaceae
Anaxagoreoideae

Anaxagorea

 
 
 

Ambavioideae

 
 
Annonoideae
 

Bocageeae

 
 
 

Guatterieae

 
 
 
 

Duguetieae

 
 

Xylopieae

 
 
 
 

Annoneae

 
 
 

Monodoreae

 
 

Uvariaeae

 
 
 
 
 
 
Malmeoideae
 

Piptostigmateae

 
 
 

Malmeeae

 
 
 

Maasieae

 
 
 

Fenerivieae

 
 
 

Phoenicantheae

 
 
 

Dendrokingstonieae

 
 
 

Monocarpieae

 
 

Miliuseae

 
 
 
 
 
 
 
 
 
 
 

In a phylogeny-based reclassification of the family[4] four subfamilies are recognised: Anaxagoreoideae (including just Anaxagorea), Ambavioideae, Annonoideae, and Malmeoideae. A number of the larger genera, including Guatteria, with its 177 species,[8] 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:[9] For a concise bibliographic overview of the taxonomic literature (1900 to 2012) see:[10]

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.[11][12][13] The oldest fossil evidence of Annonaceae is described as the genus Futabanthus, from the late Cretaceous of Japan,[14] which represents a minimum age of c. 89 Mya for the most recent common ancestor (crown group) of the family.[15] 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.[16][17]

Taxonomic revisions within the subfamily Malmeoideae

The reclassification and establishment of Hubera

The genus Hubera was resolved to be sister to Miliusa, with certain species previously under Polyalthia being additionally reclassified.[18] This reclassification was highly supported by maximum parsimony, Bayesian analysis, and morphological characters. Hubera is characterized by reticulate tertiary venation, axillary inflorescences, 1 ovule per ovary, seeds with flat to slightly raised raphes, and other characters. Hubera's phylogenetic distance and morphological difference from Monoon and Polyalthia, distinguish Hubera on the generic level. Morphologically, Hubera has a finely and densely granular infratectum whereas Monoon and Polyalthia have columellate or densely granular infratectums.[18]

The creation and establishment of Winitia

Winitia is sister to Stelechocarpus burahol, with Stelechocarpus cauliflorus being reclassified under the new genus. The Winitia is characterized by mixed flowers, multicolumellar stigmas, and columellate/coarsely granular infratectum. This genus was created after phylogenetic analysis that highly supported an unclassified species from Thailand being sister to Stelechocarpus cauliflorus as a monophyletic group.[19]

Reclassification of Annickia as tribe Annickieae

The genus Annickia was previously included within the tribe Piptostigmateae. However, it is highly supported to being sister to the rest of the Malmeoideae tribes, and weakly supported to being sister to the rest of the Piptostigmateae genera. For these reasons, Annickia is now classified within its own tribe in the Malmeoideae, the Annickieae.[20]

Genera

The taxonomy of the Annonaceae is based on the Angiosperm Phylogeny Website, which recognises four subfamilies[21][22] and the extinct genus †Anonaspermum[23]

Anaxagoreoideae

Auth.: Chatrou et al. 2012 (monotypic)

Ambavioideae

Auth.: Chatrou et al. 2012

Annonoideae

Auth.: Rafinesque 1815

Malmeoideae

Auth.: Chatrou et al. 2012

  • Tribe Annickieae Couvreur et al., 2019 [20]
  • Tribe Piptostigmateae Chatrou & Saunders 2012
  • Tribe Malmeeae Chatrou & Saunders 2012
  • Tribe Maasieae Chatrou & Saunders 2012
    • Maasia Mols et al.
  • Tribe Fenerivieae Chatrou & Saunders 2012
  • 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 (synonym Hubera) Chaowasku
    • Marsypopetalum Scheff.
    • Meiogyne Miq. (synonyms: Ancana F. Mueller; Guamia Merrill; Fitzalania F. Muell.; Oncodostigma Diels, Polyaulax Backer)
    • 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
    • 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 Chaowasku (synonym Winitia Chaowasku) - Stelechocarpus burahol[24]
    • Stenanona Standl. (Reedrollinsia J. W. Walker)
    • Tridimeris Baill.
    • Trivalvaria (Miq.) Miq.
    • Wangia X. Guo & R.M.K. Saunders (central & southern China)
    • Wuodendron B.Xue, Y.H.Tan & Chaowasku

Uses
Asimina triloba fruit.

Food

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).[25] 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.[26][27][28][29]

The American pawpaw (Asimina triloba) has an Eastern U.S. distribution, and is currently under investigation as a commercial agricultural crop.[30]

Flower petals from sacred earflower (Cymbopetalum penduliflorum) and from related species C. costaricense[31] were traditionally used to flavor chocolate[32] before the arrival of cinnamon and the other Old World spices.[33] The dried petals are still used to flavor atoles, pinoles, and coffee.[34]

Folk medicine

The bark, leaves, and roots of some species are used in folk medicines.

Toxicology

The compound annonacin, which occurs in the seeds and leaves of many Annonaceae, including soursop (Annona muricata), is a neurotoxin and 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 indicate that annonacin is responsible for this accumulation.[35]

Other uses

Lancewood (Oxandra lanceolata)[36] 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).[36] 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.

Other
Ylang-ylang (Cananga odorata) flowers.

Chemical constituents

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.[37]

gollark: You don't have hypercomputers?
gollark: Maybe an actual stacky one.
gollark: There must be a better paradigm for this than a register machine.
gollark: Actually, isn't it all just going to be in fairly nearby regions of linear memory *anyway*?
gollark: Make the stack be registers because register good?!

References
  1. Germplasm Resources Information Network (GRIN) (2007-05-12). "Family: Annonaceae Juss., nom. cons". Taxonomy for Plants. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved 2008-04-18.
  2. Flora of North America. "2. Annonaceae Jussieu". 3. Archived from the original on 21 April 2008. Retrieved 2008-04-20. Cite journal requires |journal= (help)
  3. "Annonaceae". Integrated Taxonomic Information System. Retrieved 18 March 2008.
  4. Chatrou, L.W.; M.D. Pirie; R.H.J. Erkens; T.L.P. Couvreur; K. M. Neubig; J.R. Abbott; J.B. Mols; P.J.M. Maas; R.M.K. Saunders; Mark W. Chase (2012). "A new subfamilial and tribal classification of the pantropical flowering plant family Annonaceae informed by molecular phylogenetics". Botanical Journal of the Linnean Society. 169: S. 4–50. doi:10.1111/j.1095-8339.2012.01235.x.
  5. Chatrou, Dr. L.W. (2005-07-29). "Molecular Systematics of Annonaceae". Annonaceae Research Projects. Nationaal Herbarium Nederland. Archived from the original on 2008-01-13. Retrieved 2008-04-20.
  6. Johnson, D.M. (July–September 2003). "Phylogenetic significance of spiral and distichous architecture in the Annonaceae". Systematic Botany. 28 (3): 503–511. doi:10.1043/02-13.1 (inactive 2020-03-15).
  7. Doyle, J.A.; H. Sauquet; T. Scharaschkin (2004). "Phylogeny, molecular and fossil dating, and biogeographic history of Annonaceae and Myristicaceae (Magnoliales)" (PDF). International Journal of Plant Sciences. 165 (4): 55–67. doi:10.1086/421068.
  8. Maas, P.J.M.; Westra, L.Y.T.; Guerrero, S. Arias; Lobão, A.Q.; Scharf, U.; Zamora, N.A.; Erkens, R.H.J. (2015). "Confronting a morphological nightmare: revision of the Neotropical genus Guatteria (Annonaceae)". Blumea - Biodiversity, Evolution and Biogeography of Plants. 60 (1): 1–219. doi:10.3767/000651915X690341. ISSN 0006-5196.
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