226 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



8. Rumex conglomeratus Murr. Prod. Fl. Goett. 52. 1770. 

 TiTE locality: None given, but European. 



Specimens examined: Wliidby Island, G^art/n^r 257: Seattle, P>per 627. 



9. Rumex persicarioides L. Sp. PI. 1: :^5. 1753. 

 TiPE locality: '"In Virginia. " 



Range: British Columbia to New Brunswick, southward to California, New Mexico, and 

 Vii^inia. 



Specimens examined: Clallam County, £'Znifr 2()84; Whidbv Island, ^rartincr 250; Seat- 

 tle, Piper 714; Silver Lake, //fw/frson 2423; Coulee City, //c/wZfAvo?!, July H, 1892; Ophir, 

 Elmer in 1897; Alma, Elmer, 1897; Rock Lake, TMke d' Hull fi52: Alkali Lake, Sandherg cfc 

 Leiberg 411; Southl>end, Spillman, Aug. 17, 1899; without locality, Cooper; Mission, 

 Kreager 484; Meyers Falls, Kreager 5()(). 



Zonal di.stribition: Tran.sition. 



10. Rtimex obtusifolius L. Sp. PI. 1: ;«5. 17.53. 



Type locauty: "Habitat in Germania, Helvetia, Gallia, Anglia.'' 



Specimens examined: Seattle, Piper in 1888. 



A common and troublesome weed in western Washington. 



KuMEX ACETOSA L. IS included in Suksdorf' s list, but we have been unable to secure any 

 evidence that it occurs in the State. 



POLYGONUM. 



Stems twining; leaves cordate. 



Outer calyx segments winged in fruit; akene-s shining 1.7*. dumetorum 



Outer calyx segments not winged; akenes dull 2. P. conrxdvulus. 



Stems not twining; leaves not cordate. 



Leaves small, usually narrow; stems wiry. 



Blades of the leaves jointed on the pedicels. 



Perennial with woody rootstocks; seashore plant. . 3. P. paronychia. 

 .tVnnuals; roots fibrous. 

 Plants prostrate. 



Akenes not longer tliain the calyx 4. P. avicvlare. 



Akenes protruding from the calyx . . ^ . .. . 5. P fowleri. 

 Plants erect or ascending. 



Flowers in rather dense terminal bracteate 

 spikes. 



Bracts oblong, white-margined 6. P. polygaloides. 



Bracts lanceolate, green. 



Styles nearly obsolete; akenes 



brown, smooth 7. P. keUoggii. 



Styles evident; akenes black, 



striate 8. P. confertijlorum. 



Flowers axillary, or in loose or interrupted 

 spikes. 



Leaves rather broad, scarcely reduced 

 upward. 



Tall, branched throughout; style 



3-cleft 9. P. eredum. 



Low alpine plant ; style 3-parted. 10. P. minimum. 

 Leaves narrow, decidedly reduced 

 upward. 

 • Flowers in virgate, much elon- 



gated, loose spikes. 



