94 L E G U M I N O S M . 



22. L. Biolettii, Greene. Slender, the somewhat wiry prostrate 

 branches I 2 ft. long: herbage cinereously or canescently pubescent with 

 short appressed hairs: leaflets usually 4, cuneate-obovate, obtuse, 2 5 

 lines long: umbels on slender peduncles little surpassing the leaves, 

 unif oliolate-bracted, 6 10-flowered : calyx a line long or less, narrowly 

 funnelt'orm, the triangular pointless teeth a third as long, erect: corolla 

 2 lines long, yellow, turning dark- red: pod strongly arcuate, slender- 

 braked. Dry ridges above Mill Valley, Marin Co. 



*-* Annuals. 



23. L. eriophorns, Greene. The numerous branches a foot or two 

 long, flex MOWS, weak and prostrate : pubescence dense, somewhat tomentost: 

 leaflets 57, obovate or cuneate-oblong, acute, 36 lines long: umbels 

 short-peduncled or subsessile, bracted: fl. 3 4 lines long; calyx half as 

 long, very villous; the filiform teeth about equalling tjae tube. In 

 sandy grounds near the sea, from San Francisco southward. 



24. L. Heermam (Dur & Hilg.), Greene. Near the last, but less 

 pubescent, neither the leaflets nor the flowers more than half as large, 

 the leaflets broader and rounded. Same range as the last. 



10. TRIFOLIUM, Pliny (GLOVER). Herbs with palmately (in one 

 pinnately) 3-foiiolate leaves and adnate stipules; leaflets commonly 

 denticulate. Flowers in roundish or ovoid or somewhat depressed cap- 

 itate or umbellate clusters, on axillary or terminal peduncles. Calyx 

 5-cleft or -toothed. Corolla persistent; banner and wings commonly 

 coherent with the stamineal tube; keel mostly obtuse and shorter than 

 the wings. Stamens diadelphous. Pod concealed within or little 

 exserted from the calyx, 1 6-seeded, dehiscent or indehiscent. 



* Heads or spikes not involucrate. 

 *- Flowers pedicellate, at length reflexed; calyx-teeth subulate, not plumose. 



1. T. gracilentum, Torr. & Gray. Erect, slender, 12 ft. high, 

 wholly glabrous: stipules ovate- or linear-lanceolate, acuminate: leaflets 

 cuneale-obcordate, spinulose-serrulate, % in. long: heads 15 25-flowered : 

 calyx-teeth lanceolate-subulate, setaceously acuminate, thrice as long as 

 the tube, shorter than the usually deep reddish corolla: pod exserted, 

 2-seeded: seeds obliquely oval, straw-colored, very smooth. Open plains 

 and hillsides. April June. 



2. T. hi Nil inn. Gray. Erect, very slender, 1 ft. high, pale green and 

 glaucous, the petioles and calyx more or less pilose-villous : stipules 

 ovate-lanceolate, entire, setaceously acuminate: leaflets linear-cuneate, 

 the sides remotely toothed, apex bifid and mucronulate: peduncles slender, 

 exceeding the leaves: heads 6 15-flowered : calyx deeply 5-parted, the 



