470 FABACEAE 



Heads not involucrate; bracts inconspicuous. 



Leaflets 5-7. I. MACROCEPHALA. 



Leaflets 3. 



Plants mostly tall; stem leafy; perennials with rootstocks. 



Corolla yellow. V XII. AGRARIA. 



Corolla white, red, or purple. 

 Calyx hairy. 



Heads oblong. II. PLUMOSA. 



Heads spherical. 



Heads sessile; corolla red-purple; free portion of the stipiiles ovate. 



III. PRATENSIA. 

 Heads long-peduncled ; corolla white or pink; free portion of the 



stipules elongate-lanceolate. IV. LONGIPEDIA. 



Calyx glabrous. 



Peduncles terminal; corolla dark red or purple. V. ALTISSIMA. 

 Peduncles axillary; corolla white or rose-colored. VI. REPENTIA. 

 Plants low, pulvinate-cespitose perennials; stems scapiform. 



Calyx glabrous; leaflets minutely denticulate. VII. NANA. 



Calyx pubescent. 



Leaflets oval or obovate, strongly veined, and sharply dentate. 



VIII. GYMNOCARPA. 

 Leaflets lanceolate or linear-lanceolate, entire-margined and not strongly 



veined. IX. DASYPHYLLA. 



Heads more or less involucrate by rather conspicuous, usually more or less united bracts. 

 Plants low, densely cespitose, subacaulescent ; bracts if at all united only at the base, 



not aristate. 



Plant densely pubescent. X. ANBTNA. 



Plants glabrous. XI. PARRYANA. 



Plants with elongated leaf} stem; bracts united to a monophyllous involucre; leaflets 

 in ours spinulose denticulate. XII. INVOLUCRATA. 



I. MACROCEPHALA. 

 One species. 1. T. macrocephalum. 



II. PLUMOSA. 

 One species. 2. T. plumosum. 



III. PRATENSIA. 



One species. 3. T, pratense. 



IV. LONGIPEDIA. 

 Stem with spreading villous pubescence. 



Calyx two-thirds as long as the corolla; teeth 2-3 times as long as the calyx-tube. 



4. T. eriocephahim. 

 Calyx scarcely half as long as the corolla ; teeth only slightly longer than the tube. 



5. T. villiferum. 

 Stem appressed -pubescent or glabrous. 



Banner broad, obtuse; calyx about one-third as long as the corolla. 



6. T. macilentum. 

 Banner narrow, acute or acutish; calyx one-half to one-third as long as the corolla. 



Plant cespitose from a woody root; stem ascending; corolla salmon-colored. 



7. T. Rusbyi. 

 Plant erect, with a creeping rootstock. 



Calyx-teeth a little longer than the tube, the upper ones scarcely exceeding it 

 in length; plant usually less than 1.5 dm. high; corolla white. 



8. T. orbiculatum. 

 Calyx-teeth much exceeding the tube, the lower twice as long or nearly so; 



plant usually over 1.5 dm. high. 

 Lower part of the calyx glabrous, upper part and the teeth villous, with 



spreading hairs; corolla rose or purple. 



Flowers 13-15 mm. long, reflexed in fruit. 9. T. confusum. 



Flowers 10-12 mm. long. 



Flowers reflexed in fruit; lateral veins of leaves arched. 



10. T. harneyense. 

 Flowers not reflexed; lateral veins of the leaves not arched. 



11. T. pedunculatum. 

 Calyx hairy throughout; corolla white or yellowish white, rarely pinkish. 



Flowers not reflexed in fruit. 12. T. longipes. 



Flowers reflexed in fruit. 



Pedicels 1.5-3 mm. long; leaflets broadly oval, ovate, or obovate. 

 Stem low, decumbent, 13 dm. high; leaflets usually broadly 



obovate or oval. 13. T. latifolium. 



Stem tall, erect, 3-4 dm. high; leaflets ovate. 



14. T. Aitonii. 

 Pedicels almost none; leaflets linear-oblong to narrowly oval. 



15. T. Rydbergii. 

 V. ALTISSIMA. 



Calyx-teeth twice as long as the tube, contorted; leaflets linear to elliptic. 



16. T. Douglasii. 

 Calyx-lobes scarcely longer than the tube; leaflets oval to elliptic or lanceolate. 



Leaflets broad and obtuse; flowers about 1.5 cm. long. 17. T. Beckwithii. 



