470 FABACEAE 



Heads not involucrate; bracts inconspicuous. 



Leaflets 5-7. I. Macrocephal.\. 



Leaflets .3. 



Plants mostly tall; stem leafy; perennials with rootstocks. 



Corolla yellow. XIT. Agraria. 



Corolla white, red, or purple. 

 Calyx hairv. 



Heads oblong. II. Plumosa. 



Heads spherical. 



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



III. Praten.sia. 

 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. 

 Pedunclas 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. Dasyphyli^. 



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

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

 not aristate. 

 Plant densely pubescent. X. Andina. 



Plants glabrous. XI. Parryana. 



Plants with elongated leaf> stem; bracts imited 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. erincephalum. 

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



5. T. villi fer urn. 

 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. r. Ritsbyi. 

 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 wliite. 



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. peclunculatum. 

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



Flowero 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, 1-3 dm. liigh; 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 Unear-oblong to narrowly oval. 



15. r. 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. 



