PIPER—FLORA OF THE STATE OF WASHINGTON. 363 
Springs, Sandberg & Leiberg 401; Wilson Creek, Lake & Hull 435; Spokane, Piper; Spo- 
kane County, Suksdorf 2581; Meyers Falls, Kreager 504; Prosser, Cotton 737, 810; without 
locality, Vasey in 1889. 
ZONAL DISTRIBUTION: Upper Sonoran and Transition. 
24. Trifolium cyathiferum Lindl. Bot. Reg. 13: under pl. 1070. 1827. 
Type Locauity: “Columbia River.’’ Collected by Douglas. 
RanGeE: British Columbia to Idaho and north California. 
SPECIMENS EXAMINED: Klickitat County, Suksdorf 9; Klickitat River, Flett 1263a,; 
junction Crab and Wilson creeks, Sandberg & Leiberg 303; Spokane County, Suksdorf 2584; 
Pullman, Piper 1484; Clealum, Henderson, June, 1892; Wilson Creek, Lake & Hull 433; 
Blue Mountains, Horner 316. 
ZONAL DistRiBUTION: Arid Transition. 
25. Trifolium microdon Hook. & Arn. Hook. Bot. Mise. 3: 180. 1833. 
Tyre Locaxity: Valparaiso, Chile. 
Rance: Vancouver Island to California. Chile. 
SPECIMENS EXAMINED: Oyhut, Lam) 1266; Bellingham Bay, Suksdorf 1803; Alki Point, 
Piper in 1889; Port Ludlow, Binns; Cascade Mountains, latitude 49°, Lyall; Ilwaco, Piper 
4994, 4961. 
ZONAL DISTRIBUTION: Hfumid Transition. 
26. Trifolium microcephalum Pursh, Fl. 2: 478. 1s1/4. 
Type Locauiry: “On the banks of Clark’s River.” Collected by Lewis. The exact 
spot is on the Bitter Root River, Montana, near the mouth of the Lolo, 
Rance: British Columbia to west Montana and California. 
SPECIMENS EXAMINED: Whidby Island, Gardner 69; Puget Sound, Suckley; Everett, 
Piper, July, 1892, Tacoma, Flett 905; Charleston, Piper, July, 1895; Woodlawn, HHender- 
son, June, 1892; Ellensburg, Elmer 404; Egbert Springs, Sandberg & Leiberg 421; Muckle- 
shoot, Dr. Ruhn; Wilson Creek, Lake & Hull 434; Spokane, Piper, July, 1896; Dewart in 
1900: Henderson, July, 1892; Spangle, Suksdorf 274; Coppei River, Horner 597; without 
locality, Vasey in 1889; Clarks Springs, Areager 138; Fort Vancouver, Scouler. 
ZONAL DISTRIBUTION: Transition. 
MEDICAGO. 
Annual; flowers yellow. 
Pod, 1-seeded, black, reticulate .........-......---------------- 1. M. lupulina. 
Pod several-seeded, twisted, spiny on the edge..._..------------- 2. M. denticulata. 
Perennial: flowers violet.....-.---------.-----------+--+----------- 3. M. sativa. 
1. Medicago lupulina L. Sp. PI. 2: 779. 1755. YELLOW TREFOIL. 
TyprE LocaLity: European. 
SPECIMENS EXAMINED: Fairhaven, Piper, July, 1897; Seattle, Piper, July, 1895; Bin- 
gen, Suksdorf 2587; Walla Walla, Leckenby, May, 1898. 
2. Medicago denticulata Willd. Sp. Pl. 3: 1414. 1803. Bur CLOVER. 
Type Locatiry: None cited. 
SPECIMENS EXAMINED: Whatcom, Suksdorf 1806; Tacoma, Flett 52; Seattle, Piper in 
1888. 
3. Medicago sativa L. Sp. Pl. 2: 778. 1753. ALFALFA. 
Tyre Locauiry: “Habitat in Hispaniae, Galliae apricis.”’ 
Abundantly cultivated, especially in eastern Washington, and a frequent escape. 
PSORALEA. 
Leaflets broadly ovate...........-.-------------------------- +--+ +> 1. P. physodes. 
Leaflets lanceolate............-------------------- ee ee ee eee eee ee 2. P. lanceolata. 
