146 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE 
[Puate 60. Fie. 1.] 
60. Polygonum Parryi Greene. 
Polygonum Parryi Greene, Bull. Torr. Club, 8: 99 (1881), Fl. Francis. 135. 
Annual, dwarf and compact, glabrous, wiry and rigid, sometimes elongated and 
straggling. Stem mostly erect, 2-10 em. long, simple or branched throughout, four- 
angled, leafy and bearing flowers even to the base; leaves narrowly linear, .5—-2 em. long, 
of much the same size throughout, subulate-tipped, not articulated to the ocreae, devel- 
oping two lateral nerves along the margins parallel to the midrib; ocreae funnelform, 3 
mm. long, soon extremely lacerate so as to appear cottony, usually hiding the calyx; 
inflorescence axillary, a single flower arising at each node; spikes usually dense, 1-4 em. 
long, clothed with the cottony segments of the imbricate ocreae; flowers sessile in the 
axils, not exceeding the ocreae; calyx 1.5 mm. long, five-cleft; stamens eight, included ; 
style .1 mm. long, three-parted, the segments apparently formed by the splitting of the 
apex of the achene, included; achene triquetrous, 1.5 mm. long, broadly oblong or ovoid, 
somewhat rhombic, dark chestnut, nearly smooth and shining. 
From Falcon Valley, Washington, south to the Yosemite Valley, California. 
[PLatEe 60. Fie. 2.] 
61. Polygonum Bidwelliae 8. Watson. 
Polygonum Bidwelliae S. Watson, Proc. Am. Acad. 14: 294 (1879); Greene, FI. 
Francis. 135, 
Annual, slender, glabrous and shining. Stem erect, .8-1.2 dm. long, flexuous, four- 
angled, divergently branched, branches and branchlets equalling or exceeding the stem 
in length, leafy especially at the ends; leaves linear, .5-1 cm. long, somewhat fleshy, 
subulate-tipped, more or less reflexed, with two lateral nerves developed on each margin 
parallel to the midrib; ocreae funnelform, 4 mm. long, silvery and conspicuous, imbri- 
cated, two-parted, the principal divisions ovate, at length more or less lacerate and 
sharply serrate; inflorescence axillary, a single flower borne at each node, the axis of 
the branch or branchlet shortened so as to form a spike; spikes rather stout, 1-3 em. 
long, covered by the conspicuous imbricated ocreae; calyx rose-colored, 1.8-2 mm. 
