PIPER FLORA OP THE STATE OF WASHINGTON. 363 



Springs, S a 71(1 ben/ d' Leibertj 401; Wilson Viwk, Lalic <.{• HuJI 4'.ir): Spokane, Piper: Spo- 

 kane County, <S«^.«Zor/" 2581 ; Meyers Falls, A'/car/fr .504; Prosser, (^'o//on 737, SIO; without 

 locality, Vaseij in 1889. 



Zonal distribittion: Upper Sonoian and Transition. 



24. Trifolium cyathiferum Lindl. Bot. Reg. 13: under /;/. 1070. 1827. 

 Type locality: "C'olunil)ia River. " Collected by Douglas. 



Range: British Columbia to Idaho and north Calirornia. 



Speclmens examined: Klickitat County, SuTcsdorf 9; Klickitat River, FJeit 1263a 

 junction Crab and Wilson creeks, Sandherg & Leiberg 303; wSpokane County, Sulcsdorf 2584 

 Pullman, Piper 1484; Clealum, Henderson, June, 1892; Wilson Creek, Lake d- Hull 433 

 Blue Mountains, Horner 316. 



Zonal dlstribution : Ai'id Transition. 



25. Trifolium microdon Hook. & Arn. Hook. Bot. Misc. 3: 180. 1833. 

 Type locality; \'alparaiso, Chile. 



RANCiE; Vancouver Island to California. Chile. 



Specimens examined: Oyhut, Lam?) 1266; Bellingham Bay, <S'/;fe/o// 1803; Alki Point, 

 Piper in 1889; Port Ludlow, Binns: Cascade Mountains, latitude 49°, Li/all: Ilwaco, Piper 

 4994, 4961. 



Zonal distribitiox: Humid Transition. 



26. Trifolium microcephalum Pursh, Fl. 2: 478. 1814. 



Type locality: "On the Iniiiks of Clark's River." Coll(>cted by Lewis. The exact 

 spot is on the Bitter Root River, Montana, near the mouth of tlir Lolo. 



Range: British Columbia to west Montana and California. 



Specimens examined; Whidby Island, Gardner 69; Puget Sound, SucMey; Everett, 

 Piper, July, 1892; Tacoma, Fleit 905; Charieston, Piper, July, 1895; Woodlawn, Hender- 

 son, June, 1892; Ellensburg, Elmer 404; Egbert Springs, Sandberg c& 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, Kreager 138; Fort Vancouver, Scolder. 



Zonal distribution; Transition. 



MEDICAGO. 



Annual; flowers yellow. 



Pod, 1-seeded, black, reticulate \. M . lupuUna. 



Pod several-seeded, twisted, spiny on the edge 2. M . denticulaia. 



Perennial ; flowers violet 3. M. satira. 



1. Medicago lupulina L. Sp. PI. 2: 779. 1753. Yellow trefoil. 

 Type locality'; European. 



Specimens examined: Fairhaven, Piper, July, 1897; Seattle, Piper, July, 1895; Bin- 

 gen, Suksdorf2587\ Walla Walla, Leckenby, May, 1898. 



2. Medicago denticulata Willd. Sp. PI. 3: 1414. 1803. Bur clover. 

 Type locality: None cited. 



Specimens examined; Wliatcom, Suk^dotf 1806; Tacoma, Flett 52; Seattle, Piper in 

 1888. 



3. Medicago sativa L. Sp. PI. 2: 778. 1753. Alfalfa. 

 Type locality; "Habitat in Plispaniae, Galliae apricis." 



Abundantly cultivated, especially in eastern Washington, and a frequent escape. 



PSORALEA. 



Leaflets broadly ovate \. P. jdiijsodes. 



Leaflets lanceolate : 2. P. lanceolata. 



