306 RypBERG: STUDIES ON THE Rocky MOUNTAIN FLORA 
This species is closely related to U. cardiophylla Rydb. but 
differs in its narrower leaf blades, shorter petioles, longer and 
denser inflorescence, and longer sepals. In habit it closely re- 
sembles U. gracilis but differs in its practically glabrous stem and 
thinner and more glabrous leaves. 
Montana: Emigrant Gulch, Aug. 2 3, 1897, Rydberg & Bessey 
3935 (type, in herb. N. Y. Bot. Garden); Jack Creek Canyon, July 
15, 1897, 39360; Jocko Creek, June 10, 1901, D. T. MacDougal 275; 
Melrose, July 6, 1895, P. A. Rydberg 2612; Lima, Aug. 6, 1895; 
Rydberg 2613. 
Wyominc: Halleck Canyon, July 4, 1900, Aven Nelson 7444. 
IpaHo: Priest Lake, July 28, 1900, D. T. MacDougal 235; 
Cooper’s Warm Springs, July 1892, Isabel Mulford. 
ALBERTA: Rocky Mountains, 1858, E. Bourgeau. 
Parietaria occidentalis sp. nov. | 
_ Annual; stem slender, erect, simple or branched at the base, long- 
villous, 1-4 dm. high; leaf blades thin, light green, lanceolate, 
acute at the base, obtuse at the apex, 1-4 cm. long, 5-18 mm. sae 
sparingly pubescent; bracts of the involucre linear, obtuse; sepals 
oblong or lance-oblong, obtuse or acutish. 
This species is related to P. pennsylvanica Muhl. but differs 
the long hairs of its stem, light green color, and the more obtusish 
sepals. It grows in moist shaded places. 
IpDaHo: Clearwater River, Nez Perces County, May 14, 189?) 
Sandberg, MacDougal & Heller 176 (type, in herb. N. Y. Bot. 
Garden). 
WASHINGTON: Wawawai, May 1897, Elmer 755; Alamot®, 
June 1893, Piper 1507. ; 
NEvaba: East Humboldt Mountains, August 1868, 5. Watso 
1084. 
POLYGONACEAE 
’ Eriogonum biumbellatum sp. nov. 
Suffruticose perennial, branched at the base; leaves oes 
clustered at the ends of the short branches, 2-5 cm. long, peree 
petioled; blades oblanceolate, finely tomentose on both pr high, 
young, soon glabrate and green on both sides; scapes 2-3 patel 
sparingly tomentose; involucres in compound umbels; ha 
verticillate, similar to the leaves but smaller; involucres WI" 
