Portulacaceae - Anacampseroteae - Avonia (E.Mey. ex Fenzl) Rowley
Description:
Dwarf herbaceous perennials; aerial stems succulent, with closely packed leaves obscuring internodes; roots mostly thick, woody or caudiciform with simple or branching stems
Leaves alternate, often minute, less than twice as wide as thick; green leaves not or only slightly exposed, hidden beneath imbricate papery, often scarious scales, making shoots appear white
Inflorescences terminal
Flowers 1 or few at stem tips, surrounded by scaly bracts, on short pedicels, opening for a very short time only, sometimes cleistogamous, white or rarely pink or carmine
Sepals 2, shortly connate at base, subpersistent
Petals 5, free
Stamens 5-many, adnate to petals at base; filaments white; anthers yellow
Ovary superior; ovules many; style thread-like; stigma entire or 3-lobed
Fruit an elongated 3- or 4-valved capsule
Seeds many, winged or with minute blunt protuberances
Classification Notes:
Anacampseros and Avonia belong to the tribe Anacampseroteae Nyananyo ex Rowley
Nomenclature:
Avonia (E.Mey. ex Fenzl) Rowley
Rowley: 105 (1994)
Steffens: 12 (1995)
Rowley: 49 (1995)
Anacampseros L. subgenus Avonia E.Mey. ex Fenzl
Fenzl: 295 (1839)
Anacampseros L. section Avonia (E.Mey. ex Fenzl) Gerbaulet
Gerbaulet: 543 (1992)
Rodgerson: 2 (1994)
Distribution & Notes:
Global: Species 11, Somalia, southern Africa, Zimbabwe
Southern Africa: Species 10, highest concentration of species in Namibia and Northern Cape, but extends also to Botswana, Northern Province, Free State, Western and Eastern Cape
References:
FENZL, E. 1839. Supplement. Verbesserungen und Zusätze zur ersten Abtheilung der Monographie. Annalen des Wiener Museums der Naturgeschichte 2
GERBAULET, M. 1992. Die Gattung Anacampseros L. (Portulacaceae). Botanische Jahrbücher 113
RODGERSON, C. 1994. Anacampseros Section Avonia. Cactus File 2
ROWLEY, G.D. 1994. Anacampseros and allied genera - a reassessment. Bradleya 12/1994
ROWLEY, G.D. 1995. Anacampseros, Avonia, Grahamia. A grower's handbook. The British Cactus and Succulent Society, Hants
STEFFENS, F. 1995. Anacampseros L. and Avonia (E.Mey. ex Fenzl) Rowley. Aloe 32
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