LEGUMINOSJS. 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. involucratum, Willd. Leaflets mostly oblanceolate, acute. 



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



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

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

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



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



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

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



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



so in Xo. 24. 



21. T. micro ceph.alum, Pursh. Soft hairy: involucre about 9-lobed, lobes entire. 



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



23. T. cyatbiferum, 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 testh 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, Lindl. Yellowish or white flowers often reddish tinged, large. 



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

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



5. MELILOTTJS, Tournefort. 



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



2. M. officinalis, 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 or rarely 2 in the axils: no stipules. 



Peduncle bracteate or rarely uaked 9 to 13 



