146 MEMOIRS FBOM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE 



[Plate 60. Fig. 1.] 

 6o. 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 cm. long, simple or branched throughout, four- 

 angled, leafy and bearing flowers even to the base; leaves narrowly linear, .5-2 cm. 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 cm. 

 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. 



[Plate 60. Fig. 2.] 

 6i. Polygonum Bidwelliae S. Watson. 



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

 Francis. 135. 



Annual, slender, glabrous and shining. Stem erect, .3-1.2 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 cm. 

 long, covered by the conspicuous imbricated ocreae; calyx rose-colored, 1.8-2 mm. 



