42 LEGUMINOS. 
purple. This and the last two in Cent. Cal., southward. 
$2, L. Stiveri, Kell. Leaflets broad: petioles short: standard yellow: wings rose. 
33. IL. hirsutissimus, Benth. Very hispid with viscid stinging hairs: petals purple. 
34. L, concinnus, Agardh. Very villous: lower calyx-lip trifed: standard with yellow. 
35. L. gracilis, Ayardh. Leaflets broad, 3 to 6 lines long: petals 2 or 3 lines long, 
blue and white. Monterey, 8. Rare. 
36. L. microcarpus, Sims. Calyx very villous: flowers usually blue or purple. 
37. L. densiflorus, Benth. Calyx only finely pubescent: flowers usually yellowish. 
38. L. luteolus, Kell. Leaves scattered: petioles short: flowers pale yellow. Cal. 
4. TRIFOLIUM, Linnzus. 
Leaflets mostly:5 0:7... sino cnds sa cdi eine wedewerusisarwsiee ss Misekesensee ee Lto4 
Leaflets 3: heads with no involucre. 
Flowers white or yellowish: leaflets linear to oblong..........+++.-+- 5, 6, 7, 12 
Flowers red, 6 lines long or More...... 22... 00 eee cece ene rete e te eee eeee 8,9 
Flowers small, at length reflexed...............-seeeee 10, 11, 12, 14, 15, 16 
Leaflets 3: heads with an involucre: peduncles axillary. 
Involucre green, rotate, the lobes laciniately toothed...... sbeee ease sates 17 to 20 
Involucre with entire lobes... 2. o52 i. ba esha sa ces n eG Sas oem teusewes 21, 25, 26 
Involucre cup-shaped or broad, lobes toothed.........-..-.200eeeeeee 22, 23, 24 
Involucre very small or reduced to a ring..... 2... eee cece eee teen eee 26 
§ 1. Leajlets 5 to 7, rarely 3: calyx teeth filiform, plumose. Alpine perennials. 
1. T. megacephalum, Nutt. Leaflets obovate or narrower, toothed; flowers spicate. 
2. T. Andersoni, Gr. Densely silky: leaflets entire, acute: flowers umbellate. 
3. T. Lemmoni, Watson. Leaflets coarsely serrate: flowers reflexed: ovules 2. 
4. T. Plummere, Wat. Matted, hoary: leaflets 3 to 5, oblanceolate: ovary hairy. 
§ 2. Leaflets 8: heads not involucrate, terminal or apparently 80, pedunculate: flowers 
sessile or nearly so (except No. 12): only No. 13 annual (its heads in one form sessile ) 
5. T. eriocephalum, Nutt. Flowers in dense spikes, soon reflexed: ovary hairy. 
6. T. plumosum, Dougl. Similar: flowers not reflexed; ovary smooth. 
7. T. longipes, Nutt. Similar: ovoid heads smaller: nearly glabrous. 
8. T. altissimum, Dougl. Leaflets very acute: 4 calyx teeth curved or twisted. 
9. T. Beckwithii, Brewer. Leaflets broader: heads globose: calyx teeth straight. 
10. T. Kingii, Watson. Leaflets acute: rachis produced: flowers rose-parple. 
11. T. Bolanderi, Gr. Cespitose the short stems decumbent: ovary smooth, 2-ovuled. 
12. T. Breweri, Watson. Very slender, diffuse: flowers few, nearly white, pediceled. 
13. T. Macreei, H. & A. Erect slender, 6 to 12 inches high: heads ovoid: peduncles 
long, or, in var. dichotomum, Brewer, short. (?) 
§ 3. Leaflets 3: heads small, not involucrate, pedunculate, axillary: flowers on short 
at length reflexed pedicels: glabrous annuals: ovules 2. 
