578 POLYGONACE 4 POLYGONUM 
late, acute, petioled, more or less tomentose beneath, ciliate, numerous 
near the ends of the branches: ocreae funnelform, loose,-hispid: flowers 
fewer: achenes broad!y oblong. On the high mountains of Washington. 
Var. Alaskanum Small Monogr. Polyg. 33. Stem stout, arising 
from a large rootstock, erect, 20-36 inches high, fleshy above: leaves ovate- 
lanceolate, 4-10 inches long, acuminate, obtuse or cordate at base, thin, 
pubescent both sides, or sometimes glabrous, ciliate, undulate, much 
crisped, on petioles 6-30 lines long: ocreae funnelform, 1-2 inches long, 
thin, pirate more or less hispid. On the high mountains of Washington 
to Alaska. 
P. phytolaccefolium Meisn. Small Bull. Torr. Bot. Club xix, 360. 
Herbage glabrous or very sparingly pubescent with slender hairs, light 
green, turning dark in drying: stems erect, 16-30 inches high, somewhat 
branched, channeled: leaves ovate or ovate-lanceolate, 1-7 inches long, 
acute or acuminate, thin, undulate and somewhat crisped, sometimes 
coriaceous: ocreae 6-12 lines long, more or less pubescent, brittle, early 
falling away: inflorescence consisting of axillary and terminal or panicled 
_ few loosely-flowered racemes: calyx white or pinkish. about a line long, 
not much enlarged in fruit, 5-parted to below the middle, the segments 
obovate, 2 of them often much smaller than the others. In the mountains 
of Washington, Oregon and California. , 
P. Newberryi Small Bull. Torr. Bot. Club xxi, 170. Herbage dull 
green, more or less pabescent and scurfy throughout, or somewhat glab- 
rous: stems ascending or erect, 4-17 inches high, stout and more or less 
fleshy, simple or branched: leaves ovate to broadly oblong-ovate, one-half 
to 2 inches long, rather fleshy, truncate, obtuse or acute at base, short- 
petioled or the upper ones subsessile: ocreae funnelform, about a line long: 
flowers in few-flowered axillary racemes: calyx greenish, 1-2 lines long, 
5-parted to near the base, its segments oblong or oblong-elliptic, the outer’ 
ones longer than the inner ones. Alpine and subalpine regions of Oregon 
and. Washington. 
P. Davisie Brewer Gray Proc. Am. Acad. viii, 399. Glabrous and 
glaucous or inconspicuously pubescent: stems usually slender, from an en-. 
larged and woody rootstock, erect or ascending, 2-17 inches long, flexuous 
striate, simple or sparingly branched above, leafy throughout: leaves from 
ovate to oblong or almost lanceolate, 1-4 inches long, obtuse or acutish, 
subcordate to ‘acuminate at base, undulate and ciliate: ocreae funnelform, 
3-6 lines long, more or less oblique: flowers in axillary and terminal 2-4- 
flowered loose clusters: calyx purplish-green or yellowish, about a line 
long, 5-cleft to the middle, much narrowed toward the base. On the 
highest slopes of the Cascade and Sierra Nevada Mountains. | 
SuBGENUs UI PrerstcartA Meisn. Monogr. 66. Herbaceous or 
more or less woody perennial or annual plants with the leaves all 
cauline. Ocreae mostly membranaceous, cylindric, truncate, 
naked or variously fringed. Flowersin terminal spicate racemes, 
usually geminate or paniculate, subtended hy ocreolae. Calyx. 
3--5-parted. Stamens 4-8. Style 2-3-parted or 2-5-cleft, Achenes 
lenticular or triquetrous. Cotyledons accumbent. 
P. amphibium L. Sp. 361. Perennial: glabrous when mature: stems. 
emersed or floating on the surface of the water and rooting at the nodes, 
1-10 feet long, simple or branched: leaves oblong, elliptic or elliptic-lanceo- 
late, 1-6 inches long, thickish and somewhat coriaceous, glossy above, 
rounded or narrowed at base, long-petioled to subsessile: ocreae cylindric, 
those of the stem 8-15 lines long, those of the branches surpassing the 
internodes, with or without a few bristles: flowers in a dense oblong or 
