144 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE, 
[Puare 59. ] 
59. Polygonum Greenei 8. Watson. 
Polygonum Greenei 8. 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, .8-1 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 splitting 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. 
