578 POLYGONACE^ 



POLYGONUM 



late, acute, petioled, more or less tomentose beneath, ciliate, numerous 

 near the ends of the branches : ocreae funnelform, loose, hispid : flowers 

 fewer: achenes broadly 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 petiolas 6-30 lines long: ocreae funnelform, 1-2 inches long, 

 thin, striate, more or less hispid. On the high mountains of Washington 

 to Alaska. 



P. phytolaccaefolium 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 pubescent 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. Davisiae 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 hi Persic aria Meisn. Monogr. (36. Herbaceous or 

 more or less woody perennial or annual plants with the leaves all 

 cauline. Ocreae mostly membranaceous, cylindric, truncate, 

 naked or variously fringed. Flowers in terminal spicate racemes, 

 usually geminate or paniculate, subtended by ocreolae. Calyx 

 o-5-parted. Stamens 4-8. Style 2-3-pn.rted or 2-3-cleft. Achenes 

 lenticular or triquetrous. Cotyledons accumbent. 



P. ampliibium 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 



