Trifouum. LEGUMINOS.T:, 313 



4 upper tcolh somewhat, spirally incurved or tortuous. Hook. fl. Bor.-Am. 1 

 p. i:io, t.AS. 



Orei^oii, bptwpcn the Spolcan River and Kettle Falls, Doi'frlns. Abundant 

 also on Grand Ronde Prairie, east of the RUie Mountains. JViittall. Jiiui-- 

 Aug. — U I^'lowers rather large, red. Calyx-tube cauipanulate, a little in- 

 flated. Legume 1-2-seeded. Ilnolc. 



2. T. pJitmasum (Dougl.) : silky-pubescent ; stem erect, tall ; leaflets lin- 

 ear-lanceolate, acuminate, denticulate, on very long petioles, the viiipennost 

 subsessile ; stipules linear-lanceolate, acuminate, adnate above the middle to 

 the petiole; heads of flowers conical-oblong, pedunculate, ebracteate; calyx 

 very hairy ; the teeth linear, straight, silky-plumose, longer than the tube of 

 the corolla; ovary 4-ovtded. Honk. fl. Bur.-Am. 1. p. 1.30, t. 49. 



Blue Mountains, Oregon ; in alluvial soil, Dmiirla.s, NuttnU. June-July. — 

 y Leaflets very acute. Stipules large ; the upper ones broader and shorter. 

 Spikes about 3 inches long. Flowers white, at length somewhat spreading. 

 Hook. 



.-^ 3. T. eriocfiphalxm (Niitt.l mss.) : " softly pilose or villous, stem erect; 



/ leaves all on long petioles ; leaflets lanceolate or oblong-lunceolate, acutely 

 and minutely serrulate; stipules linear-lanceolate, acuminate ; heads svibglo- 

 bose, pedunculate, the flowers at length reflrxed ; calyx very hairy, divided 

 nearly to the base; the teeth filiform, two-thirds the length of the corolla, 

 plumose. 



"Prairies of the Wahlamet, and near Fort Vancouver ; not uncommon. 

 May. — 11 Root somewhat fusiform and branching, tuberous, blackish. 

 Stem nearly simple, about a span high. Heads about an inch in diameter. 

 Flowers ochroleucous: petals and stamens united. Legume 1-seeded." 

 Nuttall. — Nearly allied to T. plumosum. 



y— 4. T. arvense (Linn.) : somewhat silky-pubescent ; stem erect, branch- 

 ing ; leaflets spatulate-lanceolate, obtu -e, minutely 3-loothed at the apex, en- 

 tire or obscurely serrulate, longer than the petiole; stipules ovate, sctaceously 

 acuminate ; spikes oblong-cylindrical, very viUous, more or less pedunculate 

 or subsessile; teeth of the calyx setaceous, longer than the corolla, at length 

 spreading; petals scarcely connected. — Emr.bot. <. 944 ; Mich.r.! tl. 2. p. 

 59; Ell. sk.2. p. 202; DC. prodr. 2. ;;. 190; Hook. I.e.; Darlingt. Jl. 

 Cest. p. 406. 



Old fields, &c. Canada! to Florida! Introduced? June-Aug. — (J) Plant 

 8-12 inches high. Spikes at length laAvny. Corolla whitish, with a purple 

 spot on the wings. Legume 1-seeded. — The spikes are at first nearly sessile 

 and as it were bracteate at the base ; but when old the peduncles are fre- 

 quently as long as the spikes. — Stone-Clover. Rabbit-Foot. 



_,—- 0. T. albopurpureuvi : decumbent or assurgent, viUous-pubescent ; leaves 

 ' all on long petioles ; leaflets narrowly cuneiform, truncate or emarginate, den- 

 ticulate; stipules ovate-lanceolate, subulate-acuminate ; spikes ovaie, very vil- 

 lous, at length on slender peduncles ; teeth of the calyx setaceous, some- 

 what spreading, rather longer than the corolla; petals scarcely connected. 



C^\\ion\\dL, Douglas! — (l) Stems filiform, somewhat branched, about 6 

 inches long. Leaflets about half an inch in length. Flowers a little larg- 

 er than in T. arvense, whitish and purple: vexillum oblong. Legume 1- 

 seeded. 



— - 6. T. pratense (Linn.) : stems ascending, a little hairy ; leaflets obcordate 

 or oblong-ovate, and often emarginate, nearly entire; stipules broadly lanceo- 

 late, membranaceous, nerved, setaceously acuminate ; heads of flowers ovate, 

 dense, nearly sessile, bracteate; teeth of the calyx setaceous, hairy, the lower 

 one much longer than the other 4, which arc equal and about half the length 



40 



