938 ASCLEPIADACEAE 
disposed. Calyx inferior: tube very short or none: sepals imbricated or separate 
in the bud. Corolla campanulate, urceolate, rotate or funnelform, 5-lobed : 
lobes commonly reflexed. A 5-lobed crown (corona) is borne between the corolla 
and the stamens, and adnate to the one or the other, or to both. Stamens 
5, adnate to the corolla, usually near its base. Filaments mostly monadel- 
phous, or distinct. Anthers attached at the base, introrse, 2-celled, converging 
around the stigma, sometimes united to each other : sacs tipped with an inflexed 
or erect scarious membrane, or unappendaged at the top, sometimes appendaged 
at the base. Pollen coherent into waxy or granular masses, one or rarely 2 such 
masses in each sac, connected with the stigma in pairs or fours by 5 glandular 
corpuscles alternate with the anthers. Disk none. Gynoecium of 2 carpels. 
Styles 2, connected at the summit by the peltate-discoid stigma. Ovules numer- 
ous in each cavity, mostly anatropous, pendulous. Fruit of 2 several-many- 
seeded follicles. Seeds compressed, usually appendaged by a long coma. Endo- 
sperm cartilaginous. Embryo nearly as long as the seed : cotyledons flat. 
Pollen granular, the grains grouped in 4’s: caudicles spoon-shaped, without a bid "h 
. PERIPLOCA. 
Pollen united in 2 waxy masses (pollinia): caudicles united by a corpuscle. 
Pollinia pendulous. 
Crown double, the outer a shallow ring, the inner consisting of 5 fleshy hood- 
like scales. 2. PHILIBERTELLA. 
Crown single. 
Erect, ascending or procumbent herbs. 
Corolla oblong-campanulate : lobes erect. 3. PODOSTIGMA. 
Corolla rotate. the lobes spreading or refiexed in anthesis. 
Corolla-lobes refiexed during anthesis. 
Anther-wings corneous. 
oods of the crown involute-concave, entire or auricled below 
the middle, crestless within, or in Acerates angustifolia 
with an obscure crest-like midrib. 4. ACERATES. 
Hoods of the crown erect, involute or complicate, each with 
an acute horn-like process within. 
Anther-wings membranous or papery: hoods of the crown ob- 
long-clavate, ascending and incurved over the anthers, with 
a narrow, lamelliform, pointless crest within. 6. ANANTHERIX. 
Corolla-lobes erect-spreading during anthesis: hoods of the crown 
pendulous or saccate at the base, curved upwards, obtuse, 
. ASCLEPIAS. 
on 
ris crested within, at least in the upper part. 7. ASCLEPIODORA. 
Twining vines. 
Crown-lobes entire or more or less 3-lobed. 
Lateral margins of the crown-lobes not involute: leaf-blades rela- 
tively narrow and not cordate at the base. 8. METASTELMA. 
Lateral margin - inv : f-blades cordate 
ae tbe of the crown-lobes involute: leaf-blade 9. ROULINIELLA. 
Crown-lobes notched or 2-awned at the apex. 
Crown-lobes 2-awned at the apex: follicles stout, strongly and 
sharply angled. 10. GONOLOBUS. 
Crown-lobes merelyznotehed at the apex: follicles slender, essen- k 
e . tially terete. 11 SEU ETOXIUUM 
Pollinia horizontal or nearly so: stigma sharply 5-angled, depressed. 12. VINCETOXICUM. 
1. PERIPLOCA L. 
Woody twining plants. Leaves opposite: blades entire. Flowers in umbels. | Calyx 
5-lobed, glandular within. Corolla deeply 5-lobed, the lobes obtuse, dextrorsely rotate, 
villous on the inner surface. Crown adnate to the base of the corolla, with 10 broad gi j 
slender elongated, entire or lobed scales or appendages. Filaments short, free, pie 
at the short appendiculate apex. Pollen granular, the grains aggregated into groups 6 
each. Follicles slender, glabrous, generally united at the apex. Seeds comose. 
1. Periploca Graàca L. Plant glabrous. Leaf-blades ovate-oblong, acute, Pal 
beneath than above : umbels cymose : peduncles shorter than the leaves : corolla- [o ^s 
brownish or greenish, each with a darker line down the middle and a whitish spot att 
base within: appendages of the crown slender, ligulate, 2-toothed at the apex. 
: : NE. 
Escaped, Massachusetts to Kansas and Florida. Nativeof Syría and the Grecian Islands. SILK VI 
2. PHILIBERTÉLLA Vail. We 
Twining perennial caulescent herbs, or partly shrubby plants. Leaves opposite: 
LJ x 
blades linear or cordate-hastate. Flowers in umbels, often fragrant and showy. ger 
small: lobes 5, acute. Corolla campanulate or rotate, a shallow entire or undulate aot 
forming an outer crown in its throat: lobes 5, longer than the tube. Inner or stami 
