PEA FAMILY. 



306 



Calyx-segments very much longer than the corolla and often so 

 plumose as to quite conceal it; heads dove-colored or olive-green, 

 ovate, with broad truncate base or more hemispherical in the 



vars. 5. T. columbinn m. 



Perennial; calyx-teeth sparingly hairy; flowers red 



v 6. T. prateme. 



Flowers pedicellate, at length reflexed; calyx-teeth subulate or setaceous, 

 not plumose. 



Calyx-teeth rigid-ciliolate; pod 1-seeded 7. T. ciliolatum. 



Calyx-teeth not ciliolate. 

 Leaflets narrow as compared with the next; the notch at apex mucron- 

 ulate; rachis not prolonged, or appearing only as a minute point; 



Sod 1-seeded 8. T. bifid urn. 

 ets obcordate, the notch at apex usually not mucronulate; rachis 

 prolonged through the head as a sterile point about 3 lines long; 

 pod 2-seeded 9. T. gracilentum. 



B. Heads subtended by an involucre, or by a mere ring in no. 21. 

 Corolla not becoming inflated. 

 Involucre cup-shaped, not deeply lobed, membranous at least at base; 

 flowers developing equally all around. 

 Lobes of the involucre toothed; teeth of the calyx much shorter than 



the tube 10. T. microdon. 



Lobes of the involucre entire; teeth of calyx longer than the tube. . . 



11. T. microcephaliuu. 



Involucre flat, rather deeply lobed, the lobes laciniately toothed; flowers 

 commonly blooming first on one side and the heads therefore one- 

 sided. 

 Annuals. 

 Herbage mostly glabrous. 

 Calyx-teeth entire. 

 Stems decumbent or ascending; leaves obovate or oblong-oblan- 



ceolate; heads mostly 3 to 6 lines broad .12. T. variegatum. 

 Stems erect, these and the peduncles almost filiform; leaves 



linear; heads 2 to 3 lines broad 13. T. oliganthum. 



Calyx-teeth not entire 14. T. tridentatum. 



Herbage soft-pubescent and clammy; flowers whitish. 



15. T. obtusifiorum. 

 Perennial; herbage glabrous; flowers rose-color; banner elliptical, 



deeply emarginate 16. T. Wormskjoldii . 



Corolla conspicuously inflated in age, the petals withering-connivent by 

 their apices and forming a bladder-like sac to the growing pod. 

 Involucre broad, setaceously many-toothed; calyx-teeth awn-like, plu- 

 mose; corolla red-purple. 

 Peduncles to 2% in. long; involucre shallowly lobed, glabrous .... 



17. 2'. barbigeni m. 



Peduncles 3 to 7 in. long; involucre pubescent, deeply lobed 



18. T. Grayi. 



Involucre deeply parted into entire lobes; calyx-teeth not plumose. 

 Involucral lobes 3 to 9 (commonly about 6) lines long; heads large; 

 flowers cream-color or yellowish; pod stipitate; seeds nearly 



smooth 19. T. fucatnm. 



Involucral lobes 2 lines long or less; heads small, *4 in. 'in diameter or 

 less; flowers purple, reddish or white; pod sessile; seeds tubercu- 



late or rugose 20. T. amphctins. 



Involucre obsolete or reduced to an entire or slightly lobed herbaceous 

 ring; leaflets serrate (or laciniate-toothed in one of the vars.) .... 



21. T. depauperation. 



1. T. Macraei H. & A. Plant much branched, the branches 

 decumbent or almost prostrate, 4 to 6 in. long; herbage villous- 

 pubescent; leaflets cuneate-oblong, obtuse, denticulate above the 

 middle, 3 to 5 lines long; heads nearly or quite sessile, solitary or 

 often occurring as a terminal pair, ovate, 4 or 5 lines high; calyx- 



22 



