304 leguminosjE. 



San Prancisco and southward along the coast. Apr. -Sept. Stem 

 covered with spreading hairs, whereas in the next, the stems are 

 comparatively glabrous. 



15. L. glaber (Vogel) Greene. Deer-weed. Very nearly gla- 

 brous, the calyx and young leaves often somewhat appressed-silky; 

 stems woody at base, tufted and reed-like on account of the sparse 

 foliage, 2 to 5 ft. high, erect with straggling branches, or sometimes 

 decumbent; leaflets mostly 3, on young shoots 4 to 6, oblong to 

 linear-oblong, 3 to 6 lines long, obtuse or acute; umbels numerous, 

 sessile; flowers 3 or 4 lines long, yellow, turning red; calyx about 2 

 lines long, its teeth subulate, erect, about J as long as the tube. — 

 (Hosackia glabra Torr.) 



Common everywhere in the Coast Ranges in the hill country: 

 Solano and Napa Cos. southward to San Diego. June-Sept. 



16. L. Benthami Greene. Similar to the preceding; umbels on 

 peduncles equaling or exceeding the leaves, usually 1 to 3-foliolate 

 bracted; calyx-teeth subulate, sometimes recurved. — (Hosackia cyti- 

 soides Benth.) 



San Francisco, Barclay, and southward to Monterey and the 

 Salinas Valley. First collected by Douglas. 



17. L. Biolettii Greene. Herbage ashy or whitish with short 

 appressed hairs; branches slender, wiry and prostrate, 1 to 2 ft. long; 

 leaflets usually 4, cuneate-obovate, obtuse, 2 to 5 lines long; pedun- 

 cles scarcely surpassing the leaves, the umbel 6 to 10-flowered and 

 1-foliolate bracted; calyx a, line long or less, the triangular blunt 

 teeth erect; corolla 2 lines long, yellow, changing to dark red; pod 

 strongly arcuate, slender beaked. 



Dry ridges, Marin Co. 



11. TRIFOLIUM L. Clovek. 

 Herbs with palmately (sometimes pinnately) 3-foliolate leaves. 

 Stipules united with the petioles and leaflets toothed or entire. 

 Flowers white, yellow, red or purplish, in heads or very short spikes. 

 Calyx 5-toothed or -cleft. Petals more or less united below by 

 their claws with the stamen-tube, mostly withering and persistent. 

 Stamens diadelphous, the teeth more or less separate. Pod often 

 included in the calyx, 1 to 6-seeded, indehiscent or opening by one 

 suture only. (Latin tres, three, and folium, leaf.) 



A. Heads not subtended by an involucre. 



Flowers nearly or quite sessile; calyx- teeth plumose or at least hairy. 

 Annuals. 



Heads sessile 1. r. Macrsei. 



Heads peduncled and 

 Few and large, commonly 1 to 3; plants stout and simple or with 1 or 



2 forks at summit; interior plains . . 2. T. amaenum. 



Several to many. 

 Calyx-segments shorter than the corolla or often somewhat surpass- 

 ing it; flowers purplish. 

 Heads cylindrical, 8 to 10 lines long, mostly with turbinate base . 

 „ , 3. T. diohotomum. 



Heads ovate, 3 to 8 lines high 4. T. albopurpureum. 



