POLYGONUM- POPULUS. 
sen ,f ega, (seneca snake-root, mountain-flax, r. or w. J. 9j.) stem erect, simple, 
lealy; 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. Tj..) ,stems numerous; leaves linear-oblong, 
alternate downwards; racemes terminal and lateral, elongated; flowers 
sessile; radical racemes procumbent, with apterous flowers. 4-8 i. 
•purpu'rca, (r. Ju. ^v}.) 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. 
lutea , (yellow milkwort, y. S. Ji.) stem, simple or branched ; lower leavesspat- 
ulate, upper ones lanceolate; flowers in globular heads ; wings of the calyx 
ovate,. mucronate ; bracts shorter than the flowers. 8-1G i. Pine barrens. 
POLYGONUM. 8—3. (Poly gone ®.) [From jpoZws, many, and gone, a joint, on account of the 
many joints in its stem .3 
avicula're , (knot-grass, w. M. 9|.) leaves lanceolate, scabrous at the margin; 
stipules short, laciniate ; stem procumbent; flowers sub-sessile, axillary, 
minute. (3-12 i. 
f a gop"yrum , (buckwheat, r-w. Ju. <v>.) racemes panicled ; leaves heart-sagit¬ 
tate ;* stem erectish, unarmed ; angles of the seeds equal. 1-2 f. Ex. 
orion”tale , (prince’s feather, r. Au. <v>.) stem erect; leaves very large, peti- 
oled, ovate, acuminate, minutely pubescent; stipul^ hairy, somewhat sa¬ 
bre-form ; flowers in crowded, terminal spikes. 4-5 f. Oldfields and road¬ 
sides. Flowers in large, pendulous, crimson spikes. Naturalized. 
POLYMNIA. 17—4. ( Corymbifercc .) [Named from Polyhymnia, the muse of eloquence.] 
canaden"sis , (v. J. 7{.) viscid-villose; leaves denticulate, acuminate, lower 
ones pinnatiiid, upper 3-lobed or entire. 2-4 f. Flowers in a loose, termi¬ 
nal panicle. Shady hills. 
POLYPGD1UM. 21—1. ( Filices .) [From polus, many, and pous^ foot, because it has many 
roots.] 
vulga/re , (polypod, Ju. 7J..) frond deeply pinnatifid; divisions lance-linear, 
obtuse, crenulate, approximate, upper ones gradually smaller; fruit-dots 
solitary; root chaffy. 8 12 i. 
POLYTHR1CHIUM. 21—2. (Musci.) [From polus, many, and thrix, hair; so called from its 
resemblance to hair.] 
juniperi'nurn , (hair cap moss, M. 7]-.} stem generally simple; leaves lance- 
linear, entire, flattish, somewhat spreading; the apophysis depressed. In 
dry woods, &c. 
POMARIA. 10—1. ( Leguminoscc .) 
glandulo'sa , (y. T 7 .) 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. (Narcissi.) [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. angustifolia , 
leaves elongated, triangular, truncate, and sub-cordate at the base. 1-2 f. 
POPULUS. 20—8. ( Amentaceai .) [The origin of the name is doubtful.] 
tremuloi'dcs, (white poplar, American aspen, Ap. T?.) 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. 
balsamifera , (balsam poplar, Ap. l^.) leaves ovate, acuminate, white, and net- 
veined beneath ; buds resinous. 70-80 f. 
angulata. (balm of Gilead, Ap. !?.) leaves ovate-deltoid, acuminate, glabrous, 
branches wing-angled. 80 f. 
dilatata, (Lombardy poplar, Italian poplar, Ap. T 7 .) leaves glabrous both sides, 
-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 
