444 201. ASCLEPIADACEAE 



i6. (2.) Corolla-tube as long as or longer than the segments. Corona-lobes 



awl-shaped ^7 



Corolla-tube shorter than the segments i8 



17. Sepals linear, without basal glands. Corolla salver-shaped, with scales at the 



throat. Anthers hairy, with a tailed connective. Ovary superior. 

 Mericarps cylindrical, smooth. Leaves linear or lanceolate. — Species 2. 



South Africa Ectadium E. Mey. 



Sepals oval, with numerous basal glands. Corolla funnel-shaped, red or 

 violet, with scales in the tube. Anthers with an acute appendage. 

 Ovary half-inferior. Mericarps ribbed lengthwise or winged. Leaves 

 oblong to ovate. — Species 2. Madagascar and Mascarenes ; also 

 cultivated in Central Africa. They yield rubber, poison, and medica- 

 ments, and serve as ornamental plants Cryptostegia R. Br. 



18. Corona double, the outer of 5 triangular, the inner of 5 obcordate scales. 



Filaments rather long. Anthers with a bristle-Hke point. — Species i. 



Central Africa Omphalogonus Baill. 



Corona simple 19 



19. Corona-lobes 2-cleft, short and thick. Corolla bell-shaped. Sepals 



acuminate, with toothed glands at the base. Anthers ending in a long, 

 awl-shaped appendage. Leaves broad-ovate. Flowers in many- 

 flowered panicles. — Species i. Island of Socotra. (Socotranthus O. 



Ktze.) Cochlanthus Balf. fil. 



Corona-lobes entire or 3-cleft 20 



20. Corona-lobes three-cleft or broadened at the base 21 



Corona-lobes entire, not broadened at the base 23 



21. Filaments united below. Stigmatic head flat. Corona-lobes thread- 



shaped. Erect shrubs or undershrubs. Leaves whorled or alternate, 



linear. Flowers in axillary cymes. — Species i. Southern West 



Africa (Angola). (Under Tacazzea Decne.) . Aechmolepis Decne. 



Filaments free. Stigmatic head short-conical 22 



22. Sepals blunt, with basal glands. Corolla bell-shaped, with narrow segments. 



Corona-lobes thread- or spindle-shaped. Erect shrubs. Leaves in 

 clusters, linear. Flowers solitary. — Species i. Island of Socotra. 



Mitolepis Balf. fil. 

 Sepals pointed. Corona-lobes usually 3-cleft. Herbs or undershrubs ; 

 underground part of the stem tuberous. Flowers in cymes. (See 8.) 



Raphiacme Harv. 



23. Corona-lobes short and broad, arising from the very short corolla-tube 



opposite the segments. Stem twining. — Species i. Madagascar 



(Under Pentopetia Decne.) .... Pentopetiopsis Cost, & Gall. 



Corona-lobes long and narrow 24 



24. Corona-lobes thread-shaped. Sepals pointed. Flowers in cymes. . 25 

 Corona-lobes club-shaped. Corolla bell- or wheel-shaped 26 



25. Corolla wheel-shaped. Anthers with a short mucro. Erect tuberous 



shrubs. Leaves whorled. — Species i. Madagascar. 



Ischnolepis Jum. & Perr. 



