Asclepiadaceae. 741 
1. Coronal-lobes connate into a tube or 
cup, at least at their base, 5- or 10- 
lobed or toothed at the top and some- 
times with minute teeth between the 
principal teeth, with or without a 
tooth, lobe, thickening or keels within 
in front of the 5 principal lobes or teeth. 
a) Corona with the 5 principal teeth 
‘or lobes alternating with the corolla- 
lobes, often furnished with appen- 
dages or keels within. ..... 4. Cynanchum. 
8) Corona with its 5 deeply concave- . 
hooded lobes opposite the corolla- 
LO DES pw ef supe ls ed: othe ahs tfayiety yD) BOlomestemimas 
2. Coronal-lobes alkeen acing with the co- 
rolla-lobes and opposite to the anthers, 
free to their base or partly or entirely 
adnate to the staminal-column. 
a) Stem twining. ......... 6, Oxystelma. 
8) Stem not twining. 
-+- Coronal-lobes laterally flattened, 
with an upeurved spur at the 
DASE eke eerie a . ; - 7. Calotropis. 
++ Coronal-lobes ane Bea at the 
hasepe Use 8. Asclepias. 
C. Tribe III: Ceropegieae. — eens with ae 
filaments connate into a tube and adnate at the 
top to the dilated part of the style. Anthers 
erect or incumbent on the top of the style, with 
or without an apiculus or a short terminal append- 
age. Pollen-contents of each anther-cell united 
~ into one waxy mass. Pollen-masses_pellucid 
along the inner margin or at the apex, attached 
in pairs to the pollen-carriers by short caudicles, 
erect, ascending, or horizontal in the anther-cells, 
never pendulous. Pollen-carriers sometimes with 
a wing-like expansion on each side, horny, hard, 
dark-coloured. Stems herbaceous or fleshy, often 
twining, with well-developed leaves, rarely leafless 
and then without distinct angles... . . 9. Leptadenia. 
D. Tribe [V: Stapelieae. — Pollen-masses and othe 
characters as in Ceropegieae, but differing as 
follows. Stems thick and fleshy, 3- to many- 
angled, usually dwarf, erect or procumbent, tuber- 
