136 LEGUM1N0SJL. trifolium. 



cles axillary : flowers sessile or nearly so, never reflexed: pods 

 often dehiscent at the ventral suture : veins of the leaves often 

 reticulate. 



* Involucre not membranaceous, deeply lobed, the lobes laciniately 

 and sharply toothed : corolla not becoming inflated. 



T. fiiiibriatuni Lindl. Bot. Keg. t. 1070. Glabrous: stems long and 

 thick, prostrate: stipules ovate, acuminate, laciniate-spinulose : leaflets ob- 

 long or slightly cuneate, spinulose-denticulate, an inch or more long : in- 

 volucre laciniately many-cleft, shorter than the large subglobose heads of 

 purple or reddish flowers: teeth of the calyx broadly subulate, straight, 

 halt the length of the corolla, shorter than the tube, unequal, spiny: cor- 

 olla slender: pod 2-seeded. In salt marshes along the coast, Oregon to 

 California. 



T. spinulosum Dougl. Hook. El. i, 133. Glabrous: stems prostrate or 

 ascending, slender, 1-2 feet long: stipules ovate, acuminate, spinulose- 

 serrate; leaflets oblong, acute at each end, spinulose-denticulate, termi- 

 nated by a rigid spiny point; involucre often small, laciniately many-cleft, 

 shorter than the subglobose heads; teeth of the calyx narrowly subulate, 

 pungent, shorter than the corolla, 3-4 times as long as the tube ; corolla 

 white, or the keel and wings tipped with flue purple: pods 2-seeded. In 

 mountain valleys near springs, Oregon. 



T. heterodon T. & G. Fl. i, 133. Glabrous: stems several from a 

 branching perennial root, decumbent, 10-18 inches long, simple or a little 

 branched, usually producing only terminal heads: stipules membrana- 

 ceous, ovate, acuminate, laciniately serrate with subulate teeth, the lower 

 ones lanceolate and nearly or quite entire ; leaflets oblong or oval, some- 

 what cuneiform at base, mucronately ciliate-serrulate, obtuse, the lower- 

 most mostly emarginate, 6-18 lines long: heads an inch or more in diam- 

 eter depressed-globose, long-peduncled ; involucre large, foliaceous. lacini- 

 ately many-cleft with spinulose lobes, little shorter than the heads: teeth 

 of the calyx narrowly subulate, nearly equal, 2-3 times longer than the 

 tube, shorter than the corolla; petals an inch long, purple, the upper one 

 ]. ale at the tip: pods somewhat stipitate, 3-6-seeded. In salt meadows 

 along the coast, near the mouth of the Columbia river. 



T. obtusinorum Hook. Ic. PI. t. 218. Sparsely short-hairy or glabrous, 

 often more or less resinous-glandular: stems stout, a few inches to 3 feet 

 long, from an annual root, erect or decumbent, diffusely branched : lower 

 stipules scar ious, prominently nerved, lanceolate, setaceously acuminate, 

 an inch long, entire or toothed, upper ones more herbaceous, setaceously 

 pectinate: leaflets elliptic-lanceolate 12-18 lines long, spinulose-serrate. 

 acute at each end, terminated by a rigid spiny point: heads an inch or 

 more broad on long stoutish peduncles: involucre setaceously many-cleft ; 

 tube of the calyx oblong-campanulate, 3 lines long, with 10 prominent and 

 as many lesser nerves, these branching and forming reticulations above, 

 teeth subulate-spinose, entire, shorter than the tube; petals 8-10 line- 

 long, lilac-purple with dark centre: pods elliptical, 2-seeded, dehiscent. 

 (>n clayey hillsides, southwestern Oregon to middle California. . 



T. tridentata Lindl. Bot. Reg. under t. 1070. Glabrous annual: stems 

 slender, erect, simple or branched, 3-20 inches high: stipules scarious, 

 narrowly lanceolate, spinulose acuminate, the lower entire, the upper seta- 

 ceously laciniate: leaflets linear-lanceolate, 1-2 inches long, spinulose ser- 

 rate; beads nearly an inch broad: involucre orbicular, setae ously many- 

 lobed and toothed, shorter than the flowers: tube of the calyx campanii- 

 late, prominently 10-nerved, reticulated, the short oblong lobes abruptly 

 contracted above to a slender spine, often subtended by a pair of short 

 spines or teeth; flowers purlpe ami white: mature pods fully as broad as 



