Secamone

Klackenberg, Jens, 2001, Notes on Secamonoideae (Apocynaceae) in Africa, Adansonia (3) 23 (2), pp. 317-335 : 322

Key to the species of Secamone in Africa (excluding Madagascar and the Comoro Islands)

1. Corona lobes laterally compressed or subulate to almost missing ................................................................ ........................................................................ See: Key to species in GOYDER, Kew Bull. 47: 440 (1992).

1’. Corona lobes dorsiventrally flattened and about as long as the staminal column or longer ........................ 2

2. Midrib of leaf sometimes impressed above but always raised at the very central part when dry; inflorescences truely axillary; cyme a monothyrse; flowers quincunx; calyx glabrous .................................. 1. S. racemosa

2’. Midrib impressed above without raised central part; inflorescences extra-axillary; cyme irregularly di- to monochasial without single main axis; flowers contorted; calyx hairy ........................................................ 3

3. Mature leaves glabrous or with hairs along the midrib and margins mostly near the base only, and without tuberculate/papillate lower epidermis; style head projecting about twice as long as the corona lobes or longer .............................................................................................................................................. 2. S. brevipes

3’. Leaf lamina with short appressed hairs below and with tuberculate/papillate epidermis; style head projecting less than twice as long as the corona lobes ................................................................................................ 4

4. Corolla lobes at least twice as long as the corolla tube; corolla tube glabrous inside .......... 4. S. letouzeana

4’. Corolla lobes about as long as the corolla tube; corolla tube hairy inside ................................ 3. S. goyderi