132 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 



[Plate 53.J 

 53. Polygonum Nuttallii Small. 

 Polygonum rider medium Nuttall ; S. Wats. Proc. Am. Acad. 17 : 378 (1882), not Ehrh. 



Annual, slender, wiry, glabrous throughout. Stem erect, .3-3 Cm. long, simple or 

 irregularly and divergently branched, dark red, four-angled and slightly winged especially 

 above; lea^'es varying from linear-lanceolate to linear-oblanceolate, .8-3 cm. long, .2-. 3 

 cm. broad, acute, sessile, glaucescent beneath, more or less revolute, articulated to the 

 ocreae ; ocreae funnelform, 3-4 mm. long, oblique, at length lacerate ; inflorescence axil- 

 lar}^, consisting of se^'el■al-fiowered clusters, mostly confined to the ends of the branches 

 and appearing as terminal racemes by the shortening of the internodes; pedicels 1.5-2 

 mm. long, slender, reddish; calyx greenish, 2.5 mm. long, five-parted to near the base, 

 the segments oblong with pinkish margins; stamens eight, sometimes fewer, included, 

 the filaments conspicuously dilated at the base; style .3 mm. long, included, three-parted 

 to the base; acheno triquetrous, 2-2.3 mm. long, ovoid or sometimes ovoid-oblong, 

 slightly constricted near the apex, black, smooth and shining. 



British Columbia to Oregon. 



