URTICACEAE 435 
leaf-blades reniform, to rhombic-orbicular or orbicular-ovate, obtuse, A 
long-petioled: sepals abruptly pointed: achene E Tae dos H 
et sandy soil, often in hammocks, E an pis en. Fla umerous very Sali 
leaves gives this Pn the aspect of a mall- ill E oe of this 
species and those of P. floridana have pence Bean referred to the New 
Zealand P. debilis. 
4. P. officinalis L. Stem bei yee ie the base, hirsute: leaf-blades 
ovate, sometimes. idc more or less acuminate at the 
apex, petioled: sepals w am e ‘ovoid, ~ mm. long.—Sandy 
pinelands, old fields, and E pen. Fla. Nat of Eu. 
6. BOEHMERIA Jacq. Perennial herbs. Leaves opposite: blades 
Boones, often 3-ribbed. Flowers mone IOUN in clusters on _ branches, the 
Achene included in the a accrescent calyx.—About 50 species 
mostly in tropical regions.— The plants produce a fiber valuable for weaving 
into dcl LES 
Legf-blades leathery, finely serrate; petioles much shorter than the blades. 
1. B. Drummondiana. 
E o relatively thin, coarsely serrate ; petioles as long 
blades or little shorter. 
Main pair of lateral nerves arising at the base of the leaf- 
. 2. B. cylindrica. 
Main Da ‘of lateral nerves arising some distance above 
the base of the leaf-blade. 3. B. decurrens. 
Drummo gie e dd. Stems 2-12 dm. tall, typically rough-pubescent: 
leat blade S eum ov to elliptie-ovate, or the lower ones orbicular to reni- 
form, 2-5 c . lon bog or rarely larger, short- 
petioled: flow er-clusters mostly c contiguous: 
inflorescence- brane hes short: achene mostly 
about 1.5 mm. “wide, [B. scabra (Porter) 
Small] — (Boa P.) — Swamps 
grounds and i munere various Boone) 
Fla. to Tex., Kans., Mich., and Con 
2. B. cylindrica (L.) Willd. Stems 7 
dm. tall, typically smooth and glabro 
leaf-blades pliable, ovate to lanceolate, 3 
2 em. ] -petioled: 
mostly separate: inflorescence- ru ches 
elongate: achene mostly about : 
wide. — (BUTTON-HEMP. ka s and 
moist shaded places, m are Fla. 
to Tex., Minn., Que Me.—-Although closely ee some of our 
stinging-nettles jn habit, m amd: is devoid of stinging-hairs 
3. S Small. Stem 7—12 dm. tall, typically smooth and glabrous 
leaf- "blades Is pan late to ovate- “lanceolate, 10-18 em. long, sparsely Mund 
beneath; petioles relatively slender: flower-clusters mainly e NM achenes 
fully 1. d mm. wide.—Sandy, usually low or moist places, N Fla 
7. RAMIUM pasa Perennial shrubby plants. Leaves alternate: 
blades toothed. Flowers dioecious, in axillary or lateral compound clusters 
with slender branches, ps pistillate with 4 united sepals enelosing the ovary. 
