582 POLYGONACE.^ 



POLYGONUM 



spike-like inflorescence more or less interrupted. 



P. Douglasii Greene Bull. Cal. Acad, i, 125. Glabrous and more or 

 less glaucescent except the more or less scabrous nodes : stem slender, 8-16 

 inches high erect usually somewhat strictly branched: leaves oblong to 

 lanceolate, 6-30 lines long, mostly acute, often cuspidate, acuminate at 

 base, sessile or nearly so, the margins often revolute : ocreae 5-6 lines 

 long: flowers one to several in the axils of the upper leaves, on reflexed 

 pedicels : calyx greenish, 1-2 lines long, 5-parted to near the base, the seg- 

 ments oblong with whitish or rose-colored margins : stamens 8, included : 

 style very short, 3-parted. In dry places in the mountains of Brit. Columbia 

 to California and Nebraska. 



P. montanum Greene PL Baker. 13. P. Douglasii var. laiifolium 

 Greene Bull. Cal. Acad. 125. " Low,fastigiately branched from the base, 3 

 to 6 inches high, the branches floriferous from the base, but the flowers 

 few among the proper leaves, most of them forming a mere bracted spike 

 beyond the foliage, all the angles of stem and branches denticulate-scaber- 

 ulous, and other parts also more or less scrabro-puberulent : leaves oblong- 

 lanceolate, very acute, often an inch long. 1 -nerved, the nerve sharply cari- 

 nate beneath the leaf: perianth subsessile but nodding, its segments dark 

 green or purplish except marginally and completely enclosing the achene, 

 this black, smooth and shining, the faces obtusely rhomboidal, the cross- 

 section 3-lobed rather than triangular." On high mountains, Brit. Co- 

 lumbia to California and the Rocky Mountains. 



P. Howellii Greene PL Baker. 14. Stem erect, 4-12 inches high, 

 sparingly branched from the base, the branches erect: leaves elliptic- 

 oblong to lanceolate, very acute and apiculate, attenuate at base, 6-12 lines 

 long, the thin margins serrulate- scabrous : ocreae scarious, 2-4 lines long, 

 2-parted : flowers 1-3 in the axils of all the leaves, erect on erect pedicels : 

 calyx whitish, about a line long, 5-parted to near the base, the segments 

 oblong: achenes wholly invested by the calyx, very black and highly pol- 

 ished, the faces rhombic-ovate. On top of the Siskiyou Mountains along 

 the Happy Camp trail in California, perhaps in Oregon farther east. 



P. Sawatchense Small Bull. Torr. Bot. Club xx, 213. Glabrous and 

 more or less scurfy or papillose throughout: stem erect, 2-8 inches high: 

 leaves oblanceolate or obovate to almost linear, 3-12 lines long, acute at 

 the apex, acuminate below, sessile, flat or revolute : ocreae at length lace- 

 rate to the middle : flowers in clusters of 2-4 in the axils of all the leaves : 

 calyx green, on erect pedicels, a line or less long, 5-parted to near the base, 

 the segments oblong, obtuse : stamens 6-8 : style almost none. In the moun- 

 tains, Washington to Colorado and Dakota. 



P. ramosissimnm Michx. Fl. i, 237. Glabrous throughout : stem erect 

 or ascending, 4-12 inches high, nearly simple or diffusely branched : leaves 

 lanceolate to oblong, 4-20 lines long, acuminate at both ends, short- 

 petioled, persistent: ocreae 3-9 lines long, early becoming lacerate : flowers 

 in small clusters in the axils of the upper leaves: calyx greenish or yellow, 

 about a line long, erect, on erect pedicels, 5-parted or 6-parted to near the 

 base, the segments narrowly oblong: stamens 6 or fewer, included: style 

 very short, 3 parted to the base. In the mountains, eastern Washington 

 to California and the Atlantic States. 



P. Engelmanni Greene Bull. Cal. Acad, i, 126. Glabrous: stem 

 very slender and wiry, 2-8 inches long, nearly simple or diffusely branched 

 from the base : leaves linear-lanceolate, 1-6 lines long, light green or glau- 

 cous, beneath, acute, sessile: ocreae funnelform, about 2 lines long, at 

 length slightly lanceolate : flowers in small fascicles in the axils of all the 

 leaves, nodding on reflexed pedicels : calyx dark green, a line long, 5-parted 

 to near the base, the segments oblong, obtuse, with whitish border: sta- 



