42 LEGUMINOS^. 



purple. This and the last two in Cent. Cal., southward. 



32. li. Stiveii, Kell. Leaflets broad: petioles short: standard yellow: wings rose. 



33. Xi. hirsutissimus, Benth. Very hispid with viscid stinging hairs: petals purple. 



34. li. concinnus, Agardh. Very villous: lower calyx-lip trifed; standard with yellow. 



35. li. gracilis, Agardh. Leaflets broad, 3 to 6 lines long: petals 2 or 3 lines long, 

 blue and white. Monterey, S. Rare. 



36. L. microcarpus, Siins. Calyx very villous: flowers usually blue or purple. 



37. L. densifl.orus, Benth. Calyx only finely pubescent: flowers usually yellowish. 



38. Xi. luteolus, Kell. Leaves scattered: petioles short: flowers pale yellow. Cal. 



4. TRIFOLIUM, Linnaeus. 



Leaflets mostly 6 to 7 1 to 4 



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 8, 9 



Flowers small, at length reflexed 10, 11, 12, 14, 15, 16 



Leaflets 3: heads with an involucre: peduncles axillary. 



Involucre green, rotate, the lobes laciniately toothed. 17 to 20 



Involucre with entire lobes 21, 25, 26 



Involucre cup-shaped or broad, lobes toothed 22, 23, 24 



Involucre very small or reduced to a ring 26 



§ 1. Leaflets S to 7, rarely S: calyx teeth filiform, plumose. Alpine perenniah. ' 



1. T. megaoephalum, Nutt. Leaflets obovate or narrower, toothed; flowers spicate. 



2. T. Andersoni, Gr. Densely silky: leaflets entire, acute: flowers umbellate. 



3. T. lienuuoni, Watson. Leaflets coarsely serrate: flowers reflexed: ovules 2. 



4. T. Pliunmerse, Wat. Matted, hoary: leaflets 3 to 5, oblanceolate: ovary hairy. 



§ 2. Leaflets S: heads not involucrate, terminal or apparently so, pedunculate: flowers 

 sessile or nearly so (except No. 12) : only No. IS annual (its heads in one form sessile). 



5. T. eriooephalum, 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-purple. 



11. T. Bolanderi, Gr. Cespitose the short stems decumbent: ovary smooth, 2-ovuled. 



1 2. T. Breweri, Watson. Very slender, diffuse: flowers few, nearly white, pedioeled. 



13. T. Macrsei, 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, peduncvZate, axillary: fiowert on short, 

 at lenijt/i n-jlrj.-i-il /irdicels: glabrous annuals: ovules I. 



