744 ASCLEPIADE& (Brown). [ Cynanchum. 
* Plant with well developed leaves ; stems not fleshy ; 
Plant shrubby, woody, not twining: 
Branches recurving, white - tomentose; leaves 
puberulous — as oe se .. (1) Meyeri. 
Branches spreading (glabrous?) ; leaves glabrous, 
glaucous .., ok ae Ae cy .-. (2) mucronatum. 
Plant not shrubby, herbaceous: 
Plant less than 1 ft. high ; stems erect or procum- 
bent, not twining: 
Leaves linear ; corona subequally 10-lobed to half- 
way down oe (3) orangeanum. 
Leaves ovate to suborbicular; corona shortly 
5-toothed sae ey Fis ae ee» (4) Zeyheri. 
Plant with twining stems usually more than 1 ft. 
long : 
+ Leaf-blade 3-2 in. long, cuneate, rounded, sub- 
truncate or shallowly cordate at the base, 
usually obtuse and apiculate at the apex, or if 
acute, then not cordate at the base: 
Staminal column stipitate within the corona : 
Corolla-lobes 1-24 lin. long, glabrous on the 
inner face ; corona 2-2 lin. long, tubular, 
5-toothed : 
Corolla-lobes 1-1} lin. broad, dull greenish 
(or olive-brown when dried) ; teeth of 
the corona }-} as long as the tube ... (5) natalitium. 
Corolla-lobes 2 lin. broad, purple-brown ; 
teeth of the corona at least 3 as long as 
the tube... hee 
Corolla-lobes 3-4 lin. long, glabrous on the 
inner face; corona 24-43 lin. long, 
tubular, 5-10-toothed ,.. ti ... (7) africanum. 
Staminal column not stipitate : 
Corolla-lobes 13-2 lin. long, minutely 
puberulous on the inner face; corona ene 
acutely and deeply 5-lobed Ae ... (8) obtusifolium. 
Corolla-lobes 1-1} lin. long, glabrous on the 
inner face; corona truncate or slightly 
5-crenate at the tup : ': . 
tt Leaf-blade 1-3} in. long, deeply cordate to sub- 
truncate at the base, acute or attenuate-acute 
at the apex ; staminal column not stipitate : 
Corolla-lobes 2-3 lin. long, twisted, puberulous 
on the inner face ; corona 13-2 lin. long... (10) virens. 
Corolla-lobes 3 to nearly 1 lin. long, glabrous Ps 
on the inner face ; corona 4-2 lin. Jong ... (11) schistoglossum. 
**Plant leafless, with fleshy twining stems... .,. (12) ae He 
li - 
(6) intermedium. 
(9) capense. 
1. C. Meyeri (Schlechter in Engl. Jahrb. xx. Beibl. 51, 2); a shrub 
or shrublet ; branches woody, strongly recurving, 1-1} lin. thick, 
minutely white-tomentose ; leaves rigid, probably fleshy ; petiole 
1-2 lin. long ; blade 4-4 in. long, 24-5 lin. broad, orbicular or ovate, 
obtuse, apiculate, minutely puberulous on both sides; flowers in 
small fascicles, axillary or terminating short axillary branchlets ; 
