POLYGONUM- POFULUS. 
127 
sm^^ga, (seneca snake-root, mountain-flax, r. or w. J. %.) stem erect, simple, 
leafy; leaves alternate, lanceolate; spike terminal, filiform; flowers alter- 
nate, not crested. Var, albida, leaves lanceolate or oval; spike somewhat 
crowded ; flowers white, sub-sessile. 8-14 i. 
polygama, (ground-flower, p. J. %.) stems numerous; leaves linear-oblong, 
alternate dov/nwards; racemes terminal and lateral, elongated; flowers 
sessile ; radical racemes procurab(mt, with apterous flowers. 4-8 i. 
purpu'rea, (r. Ju. Cg).) stem fastigiately branched ; leaves alternate, oblong- 
linear; flowers beardless, imbricated in obtuse cylindrical spikes; rachis 
squarrose ; wings of the calyx cordate, ovate, erect, twice as long as the 
capsule. 12-18 i. Woods and hill-sides. 
iutea, (yellow milkwort, y. S. (^.) stem simple or branched ; lower leaves spat- 
ulate", upper ones lanceolate; flowers in globular heads ; wings of the calyx 
ovatC; mucronate ^ bracts shorter than the flov;ers, 8-16 i. Pine barrens. 
S'OLYGONirM. 8—3. (Polygonece.) [From polus, many, and gone, a joint, on account of the 
many joints in its stem.] 
mncula're, (knot-grass, w, M. %.) leaves lanceolate, scabrous at the margin ; 
stipules short, laciniate ; stem, procumbent ; flov/ers sub-sessile, axillary, 
minute. 6-12 i. 
fagop^yrum^ (buckwheat, r-w, Ju. @.) racemes panicled ; leaves heart-sagit- 
tate ; stem erectish, unarmed ; angles of the seeds equal. 1-2 f. Ex. 
■orien"tale, (prince's feather, r. Au. <D.) stem erect; leaves very large, peli- 
oled, ovate, acuminate, minutely pubescent ; stipules hairy, somewhat sa- 
bre-form ; flowers in crov/ded, terminal spikes. 4-5 f. Old fields and road- 
sides. Flowers in large, pendulous, crimson spikes. Naturalized. 
fOLYMNIA. 17—4. {CorymhifercB.) [Named from Polyhtjmnia, the muse of eloquence.] 
canaden'^sis, (y. J. Qj.) viscid-villose ; leaves denticulate, acuminate, lower 
ones pinnatifid, upper 3-lobed or entire. 2-4 f. Fiov;ers in a loose,. termi- 
nal panicle. Shady hills. 
POLYPOUIUM. 21—1. (Filices.) [From poltts, many, and pom, foot, because it has many 
roots.] 
vulga're, (polypod, Ju. %) frond deeply pinnatifid; divisions lance-linear, 
obtuse, crenulate, approximate, upper ones gradually smaller ; fruit-dots 
solitary ; root chatFy. 8-12 i. 
POLYTHRICHIUM. 21—2. (Musci.) [From ;>o;«s, many, and iAna:, hair ; so called from its 
resemblance to hair.] 
juniperi'num, <hair-cap moss, M. %..) stem generally simple ; leaves lance- 
linear, entire, flattish, somewhat spreading^ the apophysis depressed. In 
dry woods, &c. 
iPOMARIA. 10—1. (LeguminoscB.) 
glandulo'sa, (y. T7.) branching, glandular-punctate; branches slender, sub- 
pubescent ; leaves abruptly bi-pinnate ; leafets ovate, oblique at the base, 
entire, sessile, sub-pilose, smooth and pale-green above. S. 
PONTEDERIA. 6—1. (N'arcissi.) [Name from an ancient botanist, Pontidera.] 
corda'ta, (pickerel-weed, b. Ju. %.) leaves heart-oblong, obtuse ; spike many- 
flowered, compact ; divisions of the corolla oblong. Var. angustifoUa^ 
leaves elongated, triangular, truncate, and sub-cordate at the base. 1-2 f. 
POPULUS. 20—8. (AmentacecB.) [The ongm of the name is doubtful.] 
tremuloi'des, (white poplar, American aspen, Ap. T7.) leaves heart-roundish, 
abruptly acuminate ; tooth-serrulate, glabrous, a little pubescent at the mar- 
gin, with 2 glands at the base on the upper side^ petioles compressed, in 
the young state silky. 20-30 f. 
halsamifera, (balsam poplar, Ap. leaves ovate, acuminate, white, and ne^- 
veined beneath ; buds resinous. 70-80 f. 
angulata, (balm of Gilead, Ap. T^-) leaves ovate-deltoid, acuminate, glabrous, 
branches wing-angled. 60 f. 
dilatata, (Lombardy poplar, Italian poplar, Ap. T-^.) leaves glabrous both sidesj 
acuminate, serrate, deltoid, the breadth equal to, or exceeding the length- 
branches erect, close to the stem. It is said no pistillate plant of this spe- 
cies has been brought to America: consequently no seeds are obtained from 
it 40-80 f. Ex. 
32 
