470 FABACEAE 



Heads not involucrate; bracts inconspicuous. 



Leaflets 5-7. I. Macrocephala, 



Leaflets 3. ^ 



Plants mostly tall; stem leafy; perennials with rootstocks. 



Corolla yellow. *^ XII. Agil\ria. 



Corolla white, red, or purple. 

 Calyx hairy. 



Heads oblong. II. Pltjmosa. 



Heads spherical. 



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



III. Pratexsia. 



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

 stipules elongate-lanceolate. IV. Lonqipedia. 



Calyx glabrous. 



Peduncles terminal; corolla dark red or purple. V. Altisstma, 

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

 Plants low, pulvinate-cespitose perennials; stems scapiform. 



Calyx glabrous; leaflets minutely denticulate. VII. Nana. 



Calyx pul)escent. 



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



VIII, Gl-ArXOCARPA. 



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

 veined. IX. Dasyphyli^. 



Heads more or less inv^olucrate 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. Andtna. 



Plants glabrous. XT. Parryana. 



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

 in ours spinulqse denticulate. XIL Involucr.\ta. 



I. Macrocephal.\. 



One species. 1. T. macrocephalum. 



F 



^ . II. Plumosa. 



One species. 2. T. plumosum. 



- , III. Pratensia. 



One species. 3^ t. pretense. 



IV. Longipedia. 

 Stem with spreading \illous pubescence. 



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

 ^ , , , ,^ 4. r. eriocephalum. 



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



c^ ^ ^ 5. r. viUiferum. 



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 aiscending: corolla salmon-colored. 



Til * . ..-,_ . \ 7. T. Rusbyi. 



Plant erect, with a creeping rootstock. ^ 



Calj^-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, 



Calj-x-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. r. pedunculatum. 



calyx hairy throughout; corolla white or yellowish white, rarely pinkish, 

 blowers 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. high; leaflets usually broadly 



obovate or oval. 13. r. latifolium. 



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



•D ^- , 1 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. 



rioi IX,,,, 16. r. Douglasii. 



Caljx-lobes scarcely longer than the tube; leaflets oval to eUiptic or lanceolate. 



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



