Stems
obtusely 4-angled, with tubercle-like, deltoid, short teeth very prominent and widely spreading, arranged along angles of stem, usually with stipular denticles
Flowers
few to many in umbelliform-fasciculate inflorescences, with few to many flowers opening together or in quick succession; usually rotate, lacking an annulus, with or without a distinct tube; mostly strongly foetid
Corona
glabrous, ± cyathiform, partly or completely included, outer lobes usually broadly spreading, inner lobes erectly spreading, usually much exceeding anthers, sometimes recurved
Staminal column
hollowed below anther wings with an inwardly directed nectarial orifice
Anthers
horizontal above style head, margins often not shrinking back and frequently covering pollinia
LEACH, L.C. 1978. A contribution towards a new classification of
Stapelieae
(
Asclepiadaceae
) with a preliminary review of
Orbea
Haw. and descriptions of three new genera.
Excelsa, Taxonomic Series
1
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