126 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 
[Piare 50.] 
50. Polygonum Austinae Greene. 
Polygonum Austinae Greene, Bull. Calif. Acad. Sci. 2: 212 (1885). 
Annual, low, glabrous, scurfy throughout. Stem mostly erect, .5-1.7 em. long, 
branched from the base, sparingly branched above, four-angled and somewhat four- 
winged, scurfy especially below the nodes; leaves varying from ovate-lanceolate to oblan- 
ceolate, .5-1.5 em. long, .2-.5 em. broad, the upper ones reduced to bracts, acute, sessile, 
revolute or flat, bright green beneath, midrib prominent on the lower surface, articulations 
at the ocreae not conspicuous; ocreae funnelform, 3-4 mm. long, oblique and at length 
slightly lacerate; inflorescence axillary, consisting of clusters with two or three flowers, 
extending from near the base of the plant to the ends of the branches; pedicels 1-1.5 
long, mostly deflexed; calyx green, 2.5 mm. long, drooping, five-parted to near the base, 
the segments narrowly oblong, obtuse, with whitish borders and a dark rib; stamens 
varying from five to eight, included; style about .5 mm. long, three-parted to the base; 
achene triquetrous, 2.5-3 mm. long, ovoid or oblong, black, smooth and shining, some- 
what exceeding the calyx at maturity. 
Northwest Territory to northern California and Wyoming. 
