568 
MONOECIA TRIANDRIA. 
Sp. pi. 4. p. 336. Pursh, 2. p. 623. Nutt. 2. p. 20£. Mich. art. for. 
3. p. 320. 
Betula Serrulata, Mich. 2. p. 181. 
A shrub eight to twelve inches high, with many crooked, rather rigid 
branches. Leaves alternate, obovate, or ovate, at the summit slightly acu- 
minate, doubly serrulate, nearly glabrous on the upper surface, strongly 
veined and pubescent underneath. Stipules oval or ovate, generally obtuse. 
Sterile flowers in a long pendulous ament. Fertile in an ovate cone near 
the base of the sterile. Styles two? Seed compressed. 
Grows along the margin of water courses, very common. 
Flowers during the winter while destitute of leaves. 
BOEHMERIA. 
Masculi Calyx 4- 
partitus. Corolla 0. 
Nectarium 0. 
Foeminei Calyx 0. 
Corolla 0. Stylus 1. 
Semen 1. 
I. Cyundrica. Lin. 
B. foliis oppositis, 
ovato-oblongis, acurni- 
natis, dentatis, glabris; 
floribus dioicis; spicis 
masculis glomeratis, in- 
terrupts, foemineis cy- 
lindricis; caule herba- 
ceo. 
Gen. Pl. 1421. 
Sterile Jlorets. Ca- 
lyx 4-parted. Corolla 
0. Nectary 0. 
Fertile Jlorets. Ca- 
lyx 0. Corolla 0. 
Style 1. Seed 1. 
Leaves opposite, o~ 
vate-oblong, acuminate, 
toothed, glabrous; flow- 
ers dioecious; sterile 
spikes clustered, inter- 
rupted, fertile spikes 
cylindrical; stem her- 
baceous. 
Sp. pl. 4. p. 340. Pursh, 1. p. 112. Nutt. 2. p. 207* 
Urtica Cylindrica, Walt. p. 230. Mich. 2. p. 179. 
Stem, two to four feet high, obtusely four-angled, glabrous. Leaves ovate, 
lanceolate, acuminate, three-nerved, on pjetioles. Stipules subulate, cadu- 
cous. Flowers dioecious, the sterile in distinct clusters on a moderately 
long spike, the fertile forming a compact cylindrical spike one to two inches 
long. 
Grows in shaded wet soils. 
Flowers — June to August. 
