PIPER—FLORA OF THE STATE OF WASHINGTON, 309 
Calyx teeth hairy, not plumose. 
Flowers red; stipules aristate.......... 9. 
Flowers whitish; stipules not aristate. 
Flowers pedicelled; heads globose . 6. 7. latifotium. 
Flowers subsessile. 
Heads obovate; corollas not 
inflated; leaflets soft; stip- 
a] 
—Q 
. pratense. 
ules acuminate ........... 7. T. longipes. 
Heads globose; corollas in- 
flated; leaflets firm; stip- 
ules obtusish....2..2-.... 8. T. coviilei. 
Annuals; roots fibrous. 
Calyx teeth plumose. 
Heads ovate; flowers dark purple. ........-.--- 12. T. albopurpureum 
Heads oblong; flowers pink...........-.---.--- 13. T. arvense. 
Calyx teeth not plumose. 
Corollas whitish, not becoming papery. 
Teeth of the calyx scarious-margined and 
ciliate... 2.222... Lee eee ee ee ee ee eee 14. 7. ctliolatum. 
Teeth of the calyx not scarious-margined 
nor ciliate. 
Leaflets not notched at apex... --.-.-- 15. T. gracilentum.- 
Leaflets notched at apex...........-.. 16. T. halli. 
Corollas yellow, becoming papery in age. 
Heads 20 to 40-flowered; standard distinctly 
striate.....-...-.-2-2-----.----------- 17. 1. procumbens. 
Heads 3 to 15-flowered; standard faintly 
striate... ......02-2-----222----------- 18. T. dubium. 
Heads subtended by an involucre. 
Corolla becoming conspicuously inflated, yellowish... . -- - 19. 7. flavulum. 
Corolla not becoming inflated. 
Involucre deeply cleft, the lobes laciniately toothed; 
flowers dark purple. 
Perennial with creeping rootstocks............- 20. 7. fimbriatum. 
Annuals. 
Stems erect; calyx-lobes often 3-toothed; 
leaflets linear...........-..--.---.----- 21. T. tridentatum. 
Stems decumbent; calyx-lobes usually entire. 
Leaflets linear......2.222..-.--------- 22. T. oliganthum 
Leaflets obovate or obcordate......--..- 23. T. variegatum. 
Involucre not deeply cleft, its lobes serrate or entire; 
flowers white or pale pink; annuals. 
Glabrous; calyx teeth slender and branched. .-.. 24. 7. cyathiferum 
Villous; calyx teeth scarious-margined. 
Involucre nearly inclosing the head... ..-. 25. T. microdon. 
Involucre merely basal..........-.-.----- 26. T. microcephalum, 
1. Trifolium macrocephalum (Pursh) Poir. Encye. Suppl. 5: 336. 1817. 
Lupinaster macrocepalus Pursh, Fl. 2: 479. 1814. 
Trifolium megacephalum Nutt. Gen. 2: 105. 1818. 
Type cocaity: ‘ Headwaters of the Missouri.”” Collected by Lewis. The specimens 
were really collected, however, at ‘Rock Fort Camp,” the Dalles of the Columbia. 
Rance: Eastern Washington, eastern Oregon, and Idaho. 
