14:4 MEMOIRS FROM THE DEPAETMENT OF BOTANY OF COLUMBIA COLLEGE. 



[Plate 59.J 

 59. Polygonum Greenei S. Watson. 



Polygonum Greenei S. Watson, Proc. Am. Acad. 14: 294 (1879); Greene, Fl. Fran- 

 cis. 135. 



Annual, glabrous, slender but compact. Stem erect, 1-1.8 dm. long, generally 

 branched throughout, sometimes flexuous, wiry, four-angled or four-winged, reddish; 

 leaves linear-lanceolate or linear, .3-1 cm. long, almost bract-like, reduced to bracts 

 toward the ends of branches, revolute, more or less imbricated and often of much the 

 same size throughout, with two ribs developed along each margin parallel to the midrib, 

 not articulated to the ocreae ; ocreae funnelform, 5-8 mm. long, conspicuously lacerate, 

 the segments numerous, subulate, rigid, imbricated and clothing the upper part of the 

 stem, branches and branchlets ; inflorescence axillary and terminal, consisting of a single 

 flower at an axil, the ultimate divisions of the stem and branches forming spikes ; spikes 

 slender, 1-8 cm. long, covered by the imbricated ocreae; calyx sessile, 2-2.5 mm. long, 

 rose-colored, five-cleft, not exceeding the ocreae; stamens eight, included; style .2 mm. 

 long, three-parted, included, apparently formed by the sphtting of the apex of the ovary 

 and achene; achene triquetrous, 2-3 mm. long, narrowly ovoid or ovoid-oblong, dark 

 brown, included, smooth and shining. 



From the upper Sacramento Valley, California, to W. Klickitat county, Washington. 



