2294 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Type Locauity: “In pinetis prope arcem Vancouver’? —that is, Fort Vancouver, Wash- 
ington. Collected by Douglas. 
Rance: British Columbia and Idaho to California 
SPECIMENS EXAMINED: Clallam County, Elmer 2834; Silverton, Bouck 154; Tacoma, 
Flett 58; upper Nisqually Valley, Allen 60; Skohomish Valley, Kincaid, May, 1892; Fal- 
con Valley, Suksdorf 493; mouth of the Pend Oreille, Lyall in 1860; Nason Creek, Sand- 
berg & 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 ........-.-.---.--------------- Oxyria (p. 224). 
Leaves not reniform; sepals 6. 
Sepals unequal, the inner becoming much larger; stigmas 
tufted _.....222202220202..-.-2--0-2.--22---22------- Rumex (p. 224). 
Sepals equal; stigmas capitate ..........2 2222022222... PoLtyGonuM (p. 226). 
Flowers involucrate; stipules wanting. 
Involucre 1-flowered, coriaceous, its teeth cuspidate, often 
hooked . 2.2.2.2... 22 eee eee eee CHORIZANTHE (p. 239). 
Involucre several-flowered. 
Teeth of the involucre awn-pointed...........2-.-.--- OXYTHECA (p. 239). 
Teeth of the involucre unarmed... ....-......-------- Erroconum (p. 233). 
OXYRIA. 
1. Oxyria digyna (L.) Hill, Hort. Kew. 158. 1768. MouNTAIN SORREL. 
Rumex digynus L. Sp. Pl. 1: 337. 1753. 
Tyre Locauity: “Habitat in Alpibus Lapponicis, Helveticis, Wallicis.”’ 
Rance: Alaska to Greenland, south to New England, Colorado, and California. Europe. 
Asia. 
SPECIMENS EXAMINED: Clallam County, Klmer 2685; Cascade Mountains, latitude 49°, 
Lyall; Mount Rainier, Piper 2104; Mount Adams, Henderson, August 3, 1892; Horseshoe 
Basin, Lake & Hull 653; Bridge Creek, Elmer 692; Loomis, Elmer 563. 
ZONAL DISTRIBUTION: Arctic. 
RUMEX. Dock. 
Flowers dioecious; leaves hastate; small species. 
Inner sepals not longer than the granular akene.............. 1. R. acetosella. 
Inner sepals longer than the smooth akene...........2.-2...- 2. R. paucifolius. 
Flowers not dioecious; leaves not hastate; coarse species. 
Outer sepals without tubercles. 
Fruiting sepals cordate, 2 to 5 em. 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...... 2... --- 5. R. occidentalis. 
Outer sepals, or some of them with tubercles. 
Sepals entire or nearly so. 
Leaves flat; all lanceolate....... 2... 22.202220.0.... 6. R. salicifolius. . 
Leaves undulate, the lower cordate. 
Panicle leafy; pedicel longer than the fruit...--. - 7. RB. crispus. 
Panicle not leafy; pedicel not longer than the fruit. 8. R. conglomeratus. 
Sepals with slender teeth. 
Annual; tubercles 3; pedicels very short...... 2.2... 9. R. persicariordes. 
Perennial; tubercle 1; pedicels long............-.--- 10. R. obtusifolius. 
