224 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Type ux:autt: "In pinetis prope arcem Vancouver" — that is, Fort Vancouver, Wash- 

 ington. Collected by Douglas. 



Range: British Columbia and Idaho to California 



Specimens examined: Clallam County, Elmer 2834; Silverton, Bouck 154; Tacoma, 

 Flttt 58; upper Nisqually Valley, Allen 60: Skohomish Valley, Kincaid, May, 1892; Fal- 

 con Valley, SuJcsdorf 493-, mouth of the Pend Oreille, Lyall in 1860; Nason Creek, Sand- 

 berg tfc Leiberg 625; Blue Mountains, Piper, July, 1896; without locality, Vasey in 1889; 

 without locality, Cooper. 



Zonal distribution: Transition. 



POLYGONACEAE. Buckwheat Family. 



Flowers not involucrate; stipules sheathing. 



Leaves reniform ; sepals 4 Oxybia (p. 224). 



Leaves not reniform ; sepals 6. 



Sepals unequal, the inner becoming much larger; stigmas 



tufted RuMEX (p. 224). 



Sepals equal; stigmas capitate : Polygonum (p. 226). 



Flowers involucrate; stipules wanting. 



Involucre l-flowered, coriaceous, its teeth cuspidate, often 



hooked Chorizanthe (p. 239). 



Involucre several-flowered. 



Teeth of the involucre awn-pointed Oxytheca (p. 239). 



Teeth of the involucre unarmed Ebiogonum (p. 233). 



OXYRIA. 



1. Oxyria digyna (L.) Hill, Hort. Kew. 158. 1768. Mountain sorrel. 



Rumex digynus L. Sp. PI. 1: 337. 1753. 



Type locality: "Habitat in Alpibus Lapponicis, Helveticis, Wallicis." 



Range: Alaska to Greenland, south to New England, Colorado, and California. Europe. 

 Asia. 



Specimens examined: Clallam County, Elmer 2685; Cascade Mountains, latitude 49°, 

 Lyall; Mount Rainier, Piper 2104;- Mount Adams, Henderson, August 3, 1892; Horseshoe 

 Basin, Lake <fc Hull 653; Bridge Creek, Elmer 692; Loomis, Elmer 563. 



Zonal distribution: Arctic. 



BUMEX. Dock. 



Flowers dioecious; leaves hastate; small species. 



Inner sepals not longer than the granular akene 1. R. acetoseUa. 



Inner sepals longer than the smooth akene 2. R. paucifolius. 



Flowers not dioecious; leaves not hastate; coarse species. 

 Outer sepals without tubercles. 



Fruiting sepals cordate, 2 to 5 cm. long; leaves flat 3. R. venosus. 



Fruiting sepals ovate, 4 to 9 mm. long. 



. Leaves flat, pale, lanceolate, rounded at base 4. R. hesperius. 



Leaves crisped, oblong, truncate at base 5. R. ocddentalis. 



Outer sepals, or some of them with tubercles. 

 Sepals entire or nearly so. 



Leaves flat ; all lanceolate G. R. salicifolius. 



Leaves undulate, the lower cordate. 



Panicle leafy; pedicel longer than the fruit 7. R. crispus. 



Panicle not leafy; pedicel not longer than the fruit. S. R. conglomeratus. 

 Sepals with slender teeth. 



Annual; tubercles 3; pedicels very short 9. R. persicarioides. 



Perennial ; tubercle 1 ; pedicels long 10. JS. ohtusifolius. 



