740 Asclepiadaceae. 
figuration of the corona be attended to, for whilst there is a great general 
resemblance in the majority of species belonging to very different genera, 
the genera themselves are better defined than might have been expected 
from characters apparently so artificial. 
A, Tribe I: Periploceae. — Filaments of the stamens 
free. Anthers triangular or oblong, their con- 
nectives produced beyond the cells into short 
terminal points (apiculate), or into small dilated, 
membranous or somewhat fleshy appendages, 
connivent over the apex of the style and fre- 
quently connate at their tips. Pollen-contents 
of each anther-cell of numerous loose granules. 
each granule formed of 4 pollen-grains united 
in tetrads. Pollen-carriers spathulate, trumpet- 
shaped, or trowel-shaped, sometimes bipartite, 
horny, furnished with an adhesive gland at their 
base, not attached to the pollen-grains, but 
holding them loosely in their concave upper part 1. Periploca. 
B. Tribe IL: Cynancheae. — Stamens with the fila- 
ment-part when present connate into a tube, some- 
times very short and ring-like; anthers adnate to 
the dilated part of the style, with a membranous 
appendage. Pollen-contents of each anther-cell 
united into one waxy mass. Pollen-masses opaque, 
without a pellucid margin, attached in pairs to 
each of the pollen-carriers by short or long 
eaudicles, from which they are pendulous in 
the anther-cells. Pollen-carriers turgid, rarely 
flattened, with a dorsal suture, hard and horny, 
varying from reddish-brown to black. 
[. Corona of 5 free lobes arising from the 
eorolla-tube, none on the staminal-column, 
but sometimes inserted on the corolla just 
aboveiits base ..........-.-.. #2 Glossonema, 
If. Corona simple or double, arising from the 
staminal-column or at its very base in the 
angle where the column and corolla unite. 
a) Corona double, i. e. in two series . . . 3. Daemia, 
b) Corona in one series, no outer corona, 
but often furnished with appendages on 
the inner face of the lobes or tube formed 
by their union. 
