172 Botany of Filinois and Missourz. 
height of 8 or 10 feet, and is quite branching. Flowers te 
eedrous. 
eased Comandra umbellata N u ¢ t. 
Has. On the prairies near St Louis. April. 
Impatiens pallida Nu ¢ ¢ 
Has. Banks of streams Illinois and Missouri. July. 
Ribes recurvatum Mich. 
Has. Woods near St. Louis. April—May. 
PENTANDRIA DIGYNIA. 
Apocynum cannabinum L 7 n. 
Stem 2—3 feet high. Leaves ovate or oval, mucronate, 
attenuate at base, with revolute margins, smooth and some- 
what glaucous above, white pubeseent beneath, on short 
hairy petioles. Cyme somewhat panicled. Corol small, 
green ; tube rather shorter than the segments of the calyx. 
Has. Banks ofstreams near St. Louis. June. 
Apocynum hypericifolium A : t. 
Stem 2 feet high, branching. Leaves oblong, tapering at 
both ends, (never cordate) very acute, hairy beneath, on short 
ioles. Cyme many fi d, paniculate ; panicles erect. 
Calyx about as long as the tube of the corol. 
aB. Gravelly banks of streams. Missouri. June. 
This species resembles the last, but differs from it in having 
the leaves smaller, narrower, and tapering each way from 
about the middle ; and also in having its inflorescence more 
distinctly paniculate. There is, however, some confusion 
concerning the species of this genus. 
Asclepias syriaca Lin, 
Has. Rocky banks of the Mississippi at St. Louis. 
June. This plant sometimes attains the height of six feet. 
It is comparatively rare in these states. I have never ob- 
served it on the prairies. 
Asclepias quadrifolia Jacq. 
Has. Prairies near St. Louis and elsewhere in [Il and 
Miss. June. The western specimens have the leaves moré 
