38 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 
[PLATE 6.] 
6. Polygonum Davisiae Brewer. 
Polygonum Davisiae Brewer; A. Gray, Proc. Am. Acad. 8: 399 (1872); 8. Watson, 
Bot. Calif. 2:15; Greene, Fl. Francis. 138. 
Perennial from an enlarged and woody rootstock, glabrous and glaucous or incon- 
spicuously pubescent. Stems usually several from the enlarged base, erect or ascending, 
.O-4 dm. long, striate, flexuous, sparingly branched above or sometimes simple, leafy 
throughout; leaves varying from ovate to oblong, sometimes almost lanceolate, 1-8 em. 
long, .56-3.5 em. broad, obtuse or acutish, sessile or subsessile, varying from subcordate to 
acuminate at the base, undulate and ciliate, sometimes unsymmetrical; ocreae funnel- 
form, .5-1 cm. long, more or less oblique; inflorescence consisting of terminal and axil- 
lary clusters; clusters loose, two to four-flowered; ocreolae funnelform, 1 mm. or less 
long; pedicels slender, 2-3 mm. long; calyx purplish green or yellowish, 2.5 mm. long, 
five-cleft to the middle, much narrowed toward the base; stamens eight, included; style 
about .56 mm. long, three-parted to the base; achene triquetrous, about 3 mm. long, 
oblong-oyoid, protruding beyond the persistent calyx, light brown, smooth and shining. 
On the highest slopes of the mountains from Washington to the Sierras of central 
co) co) 
California. 
