Oncocalamus

Life-forms

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Cladus: Commelinids
Ordo: Arecales

Familia: Arecaceae
Subfamilia: Calamoideae
Tribus: Lepidocaryeae
Subtribus: Ancistrophyllinae
Genus: Oncocalamus
Species: O. djodu – O. macrospathus – O. mannii – O. tuleyi – O. wrightianus
Name

Oncocalamus (G.Mann & H.Wendl.) H.Wendl. in O.C.E.de Kerchove de Denterghem, Palmiers: 252 (1878)

Type species: Oncocalamus mannii (H.Wendl.) H.Wendl. in O.C.E.de Kerchove de Denterghem, Palmiers: 252 (1878)

Synonyms

== Homonyms ==
Oncocalamus G. Mann & H. Wendl. ex Hook. f. Gen. Pl. 3: 881, 936. (1883)

References

Wendland, H. (1878) Les Palmiers; histoire iconographique, géographie, paléontologie, etc. Avec index général des noms et synonymes des espèces connues. Paris, 252. BHL
Govaerts, R. et al. 2015. Oncocalamus in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2015 Oct. 19. Reference page.
International Plant Names Index. 2015. Oncocalamus. Published online. Accessed: Oct. 19 2015.
Tropicos.org 2015. Oncocalamus. Missouri Botanical Garden. Published on the internet. Accessed: 2015 Oct. 19.

Oncocalamus is a monoecious genus of flowering plants in the palm family found in western Africa. The genus is the lone member of the Oncocalaminae; once placed with the vegetatively similar Eremospatha and Laccosperma in the Ancistrophyllinae, it is now isolated based on their unusual flowers and arrangement. Such a placement argues for a long and complex evolutionary process in the Calamoideae with heavy extinction rates.[2] The Greek genus name combines "horn" and "capsule".[3]

Description

The trunks are small, very spiny, and high climbing, becoming bare with age. All species form dense clusters with undivided or bifid juvenile leaves which become pinnate in maturity, with leaf sheath spines, leaflet cirri, and spiny petioles, all adapted for climbing. The leaflets are few to many, with one, two, or more folds, entire, acute, linear or sigmoid, and regularly arranged along the rachis.

As hapaxanths, the inflorescence emerges at the top of the stem, amongst reduced leaves, with male and female flowers, on a once-branched spike. The flowers are arranged in clusters of up to 11, with one or three pistillate and two to four staminate flowers at the center of the cluster. The fruit is spherical and covered in vertical rows of yellow to brown scales with one seed.
Distribution and habitat

Strictly low land rain forest inhabitants, they are found in equatorial west Africa.
References

G. Mann & H.A. Wendland ex J.D. Hooker in Bentham & J.D. Hooker, Genera Plantarum 3:881, 936. 1883. Type:O. manni
Uhl, Natalie W. and Dransfield, John (1987) Genera Palmarum - A classification of palms based on the work of Harold E. Moore. Lawrence, Kansas: Allen Press. ISBN 0-935868-30-5 / ISBN 978-0-935868-30-2
Riffle, Robert L. and Craft, Paul (2003) An Encyclopedia of Cultivated Palms. Portland: Timber Press. ISBN 0-88192-558-6 / ISBN 978-0-88192-558-6