LKGDMINOS^ 43 



14. T. gracilentum, T. & G. Flowers pale-rose to red-purple: calyx-teeth subulate. 



15. T. ciliatum, Gr. Similar: calyx teeth scarious margined, ciliolate. 



16. T. bifidum, Gr. Like 14 but smaller, the narrow leaflets bifid. 



§ 4. Leaflets S: heads subtended by an involucre: peduncles axillary: flowers in whorls, 

 sessile or nearly so: annuals. 



* Involucre deeply many-cleft, laciniate: corolla not becoming inflated, 



17. T, involucrattim, Willd. Leaflets mostly oblanceolate, acute. 



Var. heterodon, Watson. Larger heads: leaflets broader: ovules same, mostly 5 or 6. 



18. T. tridentatum, landl. Slender and erect: leaflets very narrow: ovules 2. 

 Var. obtusiflorum, Watson. Stout decumbent, glandular: leaflets broader. 

 Var. melantliuia., AVatson. Smooth, slender: heads of dark purple flowers small. 



19. T. pauoiflorum, Nntt. Slender, weak: heads few-flowered: calyx teeth long. 



20. T. monantlmra, Gr. Decumbent stems 1 to 4 inches long: heads 1 to 4-flowered. 

 * * Involucre light green, often whitish-scarums at base, not deeply lobed, broad as the the 



head, and saucer-shaped or cup-lihe: corolla not becoming inflated, or moderately 



so in No. 84- 



21. T. microcephalum, Pursh. Soft hairy: involucre about 9-lobed, lobes entire. 



22. T. microdon, II. &, A. Involucral lobes 3-toothed: calyx'teeth scarious-serrulate. 



23. T. cyatMferimi, Lindl. Smooth: bristly-branched calyx -teeth equaling the 

 corolla. Eel Eiv. and Sierra Val. to the Columbia Kiv. 



24. T. barbigerum, Torr. Mostly less than a span high: calyx teeth bristly, long. 

 Var. Adrewsii, Gr. Stouter, more hairy: plumose calyx teeth very long. 



* * * Involucre rotate, lobes entire or wanting: corolla inflated in fruit. 



25. T. fucatum, Liudl. Yellowish or white flowers often reddish tinged, large. 



26. T. depauperatum, Desvaux. Slender: flowers small: involucre often a ring. 

 Var. amplectan.3 has a larger 4-5-parted involucre. Heads in both forms small. 



5. MEIiIIiOTTJS, Tournefort. 



1. M. parviflora, Desf. Flowers yellow a line long: spikes slender. (Sweet Clover.) 



2. M. ofla.cinalis, Willd. Similar flowers 2 lines long on slender pedicels. 



3. M. alba, Lam. Flowers white. All introduced from Eu. The first common. 



6. MEDICAGO, Linnaeus. 



1. M. sativa, L. Flowers blue-purple in close nearly capitate racemes. (Alfalfa.) 

 2 M. denticulata, Willd. Flowers yellow: pod globose-coiled, prickly. (Bur Clover.) 

 3. M. macnlata, Willd. Similar: leaflets with a dark spot. All introduced from Eu, 



7. HOSACKIA, Douglas. 

 Flowers solitary OT rarely 2 in the axils: no stipules. 



Peduncle bracteate or rarely uaked 9toI3 



