136 LEGUMJXOSjE. trifouum. 



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 lobea laciniately 

 and shai-ply toothed : corolla not becoming inflated . 



T. ilmbrlatuiii Lindl. Bot. Reg. 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, 

 half the length of the ccjrolla, 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. Fl. i, 133. Glabrous: stems prostrato or 

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

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

 nated by a rigid spiny point; involucre often small, laciniately mauy-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 tine 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, mncronately ciliate-serrulat6, obtuse, the lower- 

 most mostly emarginate, 6-38 lines long: heads an inch or more in diam- 

 eter depressed-globose, long-ped uncled ; involucre large, foliaceous, lacini- 

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

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

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

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

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



T. obtnsifloruin 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 : louver 

 stipules scarious, prominently nerved, lanceolate, setaceously acuminate, 

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

 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 leaser 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. 

 On clayey hillsides, southwestern Oregon to middle California. 



T. ti-ideiitata Lindl. Bot. Reg. under t. 1070. Glabrous annual: stents 

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

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

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

 rate ; heads nearly an inch broad : involucre orbicular, setac' ously manv- 

 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 slendfr spine, often subtended by a pair of short 

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



