TRiFOui m. LEGUMINOSjE. 133 



a] >pressed hoary pubescence throughout: leaflets 3-5, obovate to oblanceo- 



late, coarsely serrate, 3-6 lines long: stipules mostly scarious and inflated : 

 peduncles shorter than the leaves; flowers few, 3-4 lines long, on short 

 pedicels: teeth of the calyx linear, but little longer than the tube, a third 

 shorter than the petalsrovary densely villous. 2-ovuled. In open forests, 

 Blue Mountains of Oregon. 



g 2. Eutrifolium. Heads not in volucrate : peduncles termi- 

 nal or apparently so: flo^wers sessile or nearly so. 



* More or less pubescent: teeth of the calyx longer than the tube, 

 very narrow: stipules linear or lanceolate, acuminate. 



+■ Teeth of the calyx plumose or hairy. 



Flowers never refiexed. 



T. albopurpureum T. iV- G. Fl. i. 313. T. Macraei of authors not If. fr 



A. Somewhat villous, with appressed or spreading hairs: stems slender, 

 branching, 6-1 2 inches high : from an annual root: stipules ovate to lanceo- 

 late, long-acuminate: leaflets obovate to narrowly oblong, obtuse or re- 

 fuse, serrulate above the middle, 2-6 lines long: flowers in dense, ovate 

 slender-peduncled heads, sessile, dark purple; calyx very villous, the 

 Straight filiform plumose teeth as long as the petals, somewhat spreading: 

 petals scarcely connected : ovary pubescent : pods I -seeded. On dry hill- 

 sides, western Washington to California. 



T. pratense L. sp. 1082. (Red Clover). Perennial: stems ascending, 

 somewhat hairy, 1-3 feet long: stipules broadly lanceolate, membrana- 

 ceous, nerved, setaceously acuminate: leaflets oocordate or oblong-ovate, 



often emarginate, nearly entire, glabrous above, 1-2 inches long: heads of 

 (lowers ovate, dense, nearly sessile, braefceate ; teeth of the calyx setaceous. 

 hairy, the lower one much longer than the other four, which are equal 

 and about half as long as the corolla ; petals purplish-red, all united into a 

 tube at the base. Roadsides and cultivated fields, common. 



T. lougipes Nutt. T. & G. Fl. i, 314. Glabrous or nearly so: stems 

 elect or ascending from spreading perennial roots. 6-20 inches high, stout: 

 Btipules mostly narrow, entire or sparsely toothed, apiculate: leaves tong- 

 petioled ; leaflets lanceolate to ovate, entire or minutely denticulate, 1-2 

 inches long, acute or obtuse, apiculate, strongly veined : flowers white, in 

 dense ovate long-peduncled heads, sessile or nearly so ; tube of the calyx 

 sparingly villous, a line long, the setaceous teeth minutely plumose ; 5-7 

 lines long, nearly equalling the corolla; upper petal irt^-, the others united 

 with the stamina] tube: ovary pubescent at the apex, shortly stipitate, 

 2-4-ovuled. In wet places and about springs, Brit. Columbia to California 

 and the Rocky Mountains. 



Var. latifoliiiin Hook. Loud. Journ. Bot. vi, 209. often low: leaflets 

 broad: flowers pedicillate, in loose heads. From the Rocky Mountains to 

 the Pacific. 



■m. +♦ Flowers at length refiexed. 



T. erioeephalnm Nutt. I. c. 313. Villous with spreading hairs, stems 

 erect, 6-10 inches high or more, from a stout perennial root: stipules linear 

 to lanceolate, entire or repand; 12-18 lines long: leaflets oblong to lanceo- 

 late, 1-2 inches long, acutely and minutely serrulate: flowers in dense 

 ovate spikes, yellowish or white, 4-S lines long; tube of the calyx very 

 short, its filiform plumose teeth abruptly nan-owed from a broad base, 

 nearly equalling the petals; claws of the petals united to the stamina! 

 tube; ovary hairy, 2-4-ovuled. Common in open places, western Wash- 

 ington and Oregon to northern California. 



T. pluiiiosiini Dougl. Hook. Fl. i, 130, t. 49. Silky-pubescent: stems 



