362 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



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

 Type locality: European. 



Specimens examined: Seattle, Piper, July, 1895; Suksdorf 1804; Tacoma, LecJcenby, 

 May, 1898. 



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

 Trifoiium minus Smith, Engl. Bot. ;;/. 12oC). 1799. 

 Type LOCALmr: Near Oxford, England. 

 Specimens examined: Chenowitli. Suksdorf 2^>5. 



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

 Type locality: Western California. 



Range: Western California. 



Specimens examined: Port Ludlow, Binns, May 25, 1890; Whatcom, Stiksdorf 1802; 

 Seattle, Piper in 1889. 



Tliese are probably all introduced from California. 



20. Trifoiium fimbriatxun Lindl. Bot. Reg. 13: jd. 1070. 1827. 

 Trifoiium spinulosum Dougl.; Hook. Fl. Bor. Am. 1: 133. 1830. 

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



Type localitti": Columbia River. Collected by Douglas. 



Range: British Columbia, Wa.sliington, Oregon, and Idaho. 



Specimens examined: Grays llarlwr, Lamb 1165; Westport, Henderson, June 25, 1892; 

 North Yakima, Mrs. Steinweg, Henderson; Spokane, Piper, Sandberg, Heller, & MacDougal 

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

 Seattle, Piper 2761; Smith 473; Henderson 2329; Olympia, Henderson 2329; Muckleshoot, 

 Dr. Ruhn; Spangle, Suksdorf 272; Medical Lake, Henderson 23.'J0; Walla Walla, Lyall in 

 1860; without locality. Cooper in 18,'>4; llwaco, Piper 4989. 



The Californian T. wormskioldii Lchm. is distinguished by its less deeply lobed 

 involucre. 



Zonal di.stribution : Transition. 



21. TrifoUum tridentatum Lindl. Bot. Reg. 13: under pi. 1070. 1827. 

 Type ixx'ality: Columbia River. Collected by Douglas. 



Range: Vancouver Island to California in the coast region. 



Specimens examined: Clallam County, Elmer 2536; Lopez Island, LyaU in 1858-59; 

 Coupeville, Gardner 71; T&coma., Flett 903; Fourth Plain, Piper 3073; Rock Island, 

 Henderson; Vancouver, Piper 4933. 



Zonal distribution: Humid Transition. 



22. Trifoiium oUganthum Steud. Norn. ed. 2. 2: 707. 1841. 

 Trifoiium pauciflorum Nutt.; Torr. & Gr. Fl. 1: 319. 1838, not Urv. 1822. 



Type locality: "Wet places on the higher plains of the Oregon, particularly abundant 

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



Range: Vancouver Island to California in the coast region. 



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

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



Zonal distribution: Humid Transition. 



23. Trifoiium variegatimi Nutt.; Torr. & Gr. Fl. 1: 317. 1838. 

 Trifoiium melananthum Hook. & Am. Bot. Beech. Voy. 331. 1839. 



Type locality: "Springy places near the mouth of the Wahlamet," Oregon. Col- 

 lected by Nuttall. 



Range: British Columbia to California and Idaho. 



Specimens examined: Coupeville, Gardner 6H; Seattle, Piper in 1888; Smith; Olympia, 

 Henderson 2327, 2328; west Klickitat County, Suksdorf 2580; Fort Vancouver, Tolmie {'(); 

 Yakima County, SwAsdor/" 273; Yakima, Watt; Ellensburg, Whited 491; Elmer 402; Egbert 



