362 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



17. Trifolium procumbens L. Sp. PI. 2: 772. 1753. 

 Type locality: European. 



vSpECiMENs examined: Seattle, Piper, July, 1895; Suk-sdoff 1804; Tacoma, Leckenhy, 

 May, 1898. 



18. TrifoUum dubium Sibth. Fl. Oxon. 231. 1794. 

 Trifolium minus Smith, Engl. Bot. fl. 1256. 1799. 

 Type locality: Near Oxford, England. 

 Specimens examined: Chenowith, Svhsdorf 2585. 



19. Trifolium flavulum Greene, Pittonia 2: 223. 1892. 

 Type locality: Western California. 



Range: Western California. 



Specimens examined: Port Ludlow, Binn.^, May 25, 1890; Wliatcom, Suh'tdoif 1802; 

 Seattle, Piper in 1889. 



These are probably all introduced from California. 



20. Trifolium fimbriatum Lindl. Bot. Reg. 13: pi 1070. 1827. 

 Trifolium spinulosum Dough; Hook. Fl. Bor. Am. 1: 133. 1830. 

 Trifolium heierodon Torr. & Gr. Fl. 1 : 318. 1838. 



Ty'pe locality: Columbia River. Collected by Douglas. 



Range: British Columbia, Washington, Oregon, and Idaho. 



Specimens examined: Grays Harbor, Lamh 1165; Westport, Henderson, June 25, 1892; 

 North Yakima, Mrs. Steinweg, Henderson; Spokane, Piper, Sandherg, Heller, <£■ MacDougal 

 1028; Marshall Junction, Piper; Clallam County, Elmer 2539; Coupeville, Gardner 70: 

 §>esitt\e, Piper 2To\; Smith A7Z; Henderson 2329; 0\yYa^\&, Henderson 2329; Muckleshoot, 

 Dr. Euhn; Spangle, Suksdqrf 172; Medical Lake, Henderson 2330; Walla Walla, Lyall in 

 1860; without locality. Cooper in 1854; Ilwaco, Piper 4989. 



The Californian T. wormshioldii Lehm. is distinguished by its less deeply lobed 

 involucre. 



Zonal distribution: Transition. 



21. Trifolium tridentatum Liiidi. Bot. Reg. 13: under j.l. 1070. 1827. 

 Type locality: Columbia River. Collected by Douglas. 



Range: Vancouver Island to California in the coast region. 



Speclmens examined: Clallam County, Elmer 2536; Lopez Island, Lyall in 1858-59; 

 Coupeville, Gardner 71; Tacoma, Flett 903; Fourth Plain, Piper 3073; Rock Island, 

 Henderson; Vancouver, Piper 4933. 



Zonal di.stributiox: Humid Transition. 



22. Trifolium oliganthum Steud. Nom. ed. 2. 2: 707. 1841. 

 Trifolium pauciflorum Nutt.; Torr. & Cir. Fl. 1: 319. 1838, not Urv. 1822. 



Type locality: "Wet places on the higher plains of the Oregon, particularly al)undant 

 near the outlet of the Wahlamet." Collected by Nuttall. 



Range: Vancouver Island to California in the coasl region. 



Specimens examined: Lopez Island, Lyall in 1858; Seattle, Piper 727; Tacoma, Flett 

 904, 188; Rock Island, Henderson, July, 1892. 



Zonal distribution: Humid Transition. 



23. Trifolium variegatum Nutt.; Torr. & Gr. Fl. 1: 317. 1838. 

 Trifolium melananthum Hook. & Arn. Bot. Beech. Voy. 331. 1839. 



Type locality: "Springy places near the mouth of the ^^ahlamct,'■ Oregon. Col- 

 lected by Nuttall. 



Range: British Columliia to California and Idaho. 



Specimens examined: CJoupeville, (Vard/ier 68; Seattle, Pt/)e/' in 1888; Smith; Olyrapia, 

 Henderson 2327, 2328; west Klickitat County, Suksdorf25H0\ Fort Vancouver, Tolmie (i); 

 Yakima County, 5?/A:.S(/oa/ 273; Yakima, Watt: Ellensburg, ir/iiV^/ 491; Elmer 402; Egbert 



