42 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 



[Plate 8.] 

 8. Polygonum Hartwrightii A. Gray. 



PoJi/gonam Hartwrightii A. Gray, Proc. Am. Acad. 8: 294 (1870); S. Watson, Bot. 

 Calif. 2: 14; Coulter, Man. Bot. Rocky Mt. Reg. 320; Greene, Fl. Francis. 136, Man. 

 Bay Reg. Bot. 42. 



Perennial, more or less hispid throughout, except when growing in the water. Stem 

 creeping and ascending or suberect, 3-7 dm. long, leafy, channeled, glabrous or hispid; 

 leaves narrowly lanceolate, oblong-lanceolate or oblong, 6-18 cm. long, 1.5-3 cm. broad, 

 obtuse or acutish at both ends, short-petioled or sessile; ocreae cylindric, 1-1.5 cm. long, 

 almost half as long as or equalling the internodes, Avith a more or less patent rim at the 

 summit fringed with short bristles ; inflorescence consisting normally of a single terminal 

 spicate raceme ; raceme varying from oblong to conic, 1-3 cm. long, erect ; ocreolae fun- 

 nelform, 1-2 mm. long, somewhat oblique, ciliate, membranous, very thin; pedicels about 

 2 mm. long; calyx rose-colored, 3-4.5 cm. long, five-parted to below the middle; stamens 

 five, exserted; style 3-4 mm. long, two-parted to below the middle, exserted; achene 

 lenticular, 2.5 mm. long, oblong or broadly oblong, conspicuously biconvex, black, smooth 

 and shining, or minutely granular and dull. 



Quebec and the Hudson Bay region west to the Pacific Ocean, south to New Jersey, 

 southern Pennsylvania, Kansas and Lower California. 



