LEGUMINOSE. 43 
14. T. gracilentum, T. &G. Flowers pale-rose to red-purple: calyx-teeth subulate. 
415. .T. ciliatum, Gr. Similar: calyx teeth scarious margined, ciliolate. 
16. T. bifidum, Gr. Like 14 but smaller, the narrow leaflets bifid. 
§ 4. Leaflets : heads subtended by an involucre: peduncles axillary: flowers in whorls, 
sesstle or nearly so: annuals, 
* Iavolucre deeply many-cleft, laciniate: corolla not becoming inflated. 
17. T  involucratum, Willd. Leaflets mostly oblanceolate, acute. 
Var. heterodon, 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. melanthum, Watson. Smooth, slender: heads of dark purple flowers small. 
19. T. pauciflorum, Nutt. Slender, weak: heads few-flowered: calyx teeth long. 
20. T. monanthum, Gr. Decumbent stems 1 to 4 inches long: heads I 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 No, 24. 
21. T. microcephalum, Pursh. Soft hairy: involucre about 9-lobed, lobes entire, 
22. T. microdon, H.& A. Involucral lobes 3-toothed: calyx-teeth scarious-serrulate, 
23. T,. cyathifernm, 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 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. amplectans has a larger 4-5-parted involucre. Heads in both forms small. 
fa. 
5. MELILOTUS, Tournefort. 
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, Linnzus. 
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. maculata, Willd. Similar: leaflets with a dark spot. All introduced from En, 
7. HOSACKIA, Douglas. mA tree 
Flowers solitary or rarely 2 in the axils: no stipules. 
Peduncle bracteate or rarely naked..............- RO rere . 9013 
