370 ASCLEPIADACEJE. (MILKWEED FAMILY.) 
v&ta, Ell.) — Dry hills and sandy fields, Massachusetts to Wisconsin, 
common southward. July-Sept. —Flowers greenish, when expand¬ 
ed about the length of the pedicel. Leaves singularly variable in 
form. 
2. A. longifolia, Ell. (Long-leaved Green Milkweed.) 
Minutely hoary ; stem slender, upright; leaves elongated-linear, 
roughish; umbels peduncled , open , many-flowered ; divisions of the 
corolla ovate-oblong, several times shorter than the pedicels; hoods 
of the crown short and rounded, raised on the tube of filaments; pods 
smooth. —Moist places, Ohio and southward. June, July. — Leaves 
5' - 7' long, # - h! wide. Flowers half as large as in the last, tinged 
with yellowish and purplish. 
3. ENSEENIA, Nutt. Enslenia. 
Calyx 5-parted. Corolla 5-parted; the divisions erect, ovate- 
lanceolate. Crown of 5 free membranaceous leaflets, which are 
truncate or obscurely lobed at the apex where they bear a pair of 
flexuous awns united at their base. Anthers nearly as in Ascle- 
pias : pollen-masses oblong, obtuse at both ends, fixed below the 
apex to the descending processes of the gland. Pods oblong-lan¬ 
ceolate, smooth. Seeds with a silky tuft, as in Asclepias. — A 
perennial twining herb, smooth, with opposite heart-ovate and 
pointed long-petioled leaves, and small whitish flowers in raceme¬ 
like clusters on slender axillary peduncles. (Dedicated to A. Ens - 
len , an Austrian botanist who collected in the Southern United 
States early in this century.) 
1. E. albida, Nutt. — River-banks, Ohio and southward, com¬ 
mon. July - Sept. — Climbing 8° -12? high : leaves 3' - 5 f wide. 
4. GONOLOBUS, Michx. Gonolobus. 
Calyx 5-parted. Corolla 5-parted, wheel-shaped, sometimes 
reflexed-spreading; the lobes convolute in the bud. Crown a small 
and fleshy wavy-lobed ring in the throat of the corolla. Anthers 
horizontal, partly hidden under the flattened stigma, opening 
transversely. Pollen-masses 5 pairs, horizontal. Pods turgid, 
more or less ribbed, and armed with soft warty processes. Seeds 
with a silky tuft. — Twining herbaceous or shrubby plants, with 
opposite heart-shaped leaves, usually hairy, and racemed or eor- 
ymbed greenish or dingy purple flowers, on peduncles rising from 
between the petioles. (Name composed of yavos, an angle , and 
XojSos, a pod , from the ribbed follicles.) 
