LBOUMINOSA. 43 



14. T. ^acilentnin, T. 4; O. Flowers pale-rose to red-purple: calyx-teeth subulate 



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



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



§ 4. Lfadetx S: hfods subtended by an involucre: peduncles axillary: fiotoers in tohorls, 

 sessiU or nearly so: annuals. 



* Livolucre deeply many-ck/t, laciniate: corolla not becoming inJlcUed. 



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



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

 IS. T. tndentatum. Lindl. Slender and erect: leaflets very narrow: o>rule8 2. 

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

 Var. melanthum, Watson. Smooth, slender: heads of dark purple flowers small. 



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



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

 * " Involucre Ihjht <jree.n, often whitish- scariotis at base, not deeply lobed, broad as the the 



head, and saucer-nhaped or ciip-like: corolla not becoming inficUed, or moderately 



so in No. S4- 



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



22. T. microdon, H. & A. Involucral lobes 3-toothed: calyx-teeth scarious-serrulate. 



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

 corolla. Eel Riv. and Sierra Val. to the Columbia Riv. 



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 injiated in fruit. 



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



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

 Var. amplectans has a larger 4-5-parted involucre. HeAds in both forms smalL 



5. MELrLOTTJS, Tournefort. 



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



2. M. ofl^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. 



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

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

 S. M. macalata, Willd. Similar: leaflets with a dark spot. All introduced from Eu, 



7. HOSACKIA, Douglas. 

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



Peduncle bracteate or rarely naked to 18 



