LEGUMINOS^E. 97 



glabrous: leaflets obovate-oblong, obtuse, pectinate-denticulate, 1 in. 

 long or more: heads hemispherical, 1 in. broad or more; involucre 

 J % in. broad, laciuiate-aristate: calyx-tube scarious, 10-striate, the 

 alternate nerves less prominent, transverse veinlets 0; teeth linear-subulate, 

 much longer than the tube, all entire, or 1 or more of them setaceously 

 2 3-parted: banner elliptical, deeply emarginate, pale purple; other 

 petals darker. -On hills about San Francisco only a few inches high; 

 in springy places, or along perennial streams, large and fistulous, form- 

 ing dense masses, the leaflets often 4, and the calyx-teeth more or less 

 cut into setaceous divisions. April August. 



14. T. variegatum, Nutt. Annual, glabrous, decumbent or pros- 

 trate, with very numerous slender branches: leaflets obcordate to 

 obovate-oblong, minutely spinulose-serrate : upper stipules roundish, 

 lacinately cleft: peduncles slender, longer than the leaves: laciniate 

 involucre, shorter than the small (3 15-flowered) heads: calyx-tube 

 about 15-nerved; the teeth broadly subulate, tapering to a setaceous point, 

 longer than .the tube, shorter than the corolla: fl. dull purple or whitish. 

 Var. melananthum, Greene. More rigid, ascending, the branches often 

 a foot long or more; heads larger: calyx-teeth more triangular and only 

 pungently acute or acuminate, of a dark purple almost to the base; 

 corolla deep purple. Var. major, Loja. Flaccid and procumbent, but 

 very stout and fistulous, the branches often a yard long; leaflets oblong- 

 cuneiform, 1 in. long or more; heads 1 in. broad more or less: calyx- 

 teeth dark purple; petals purple with whitish tips. Very common and 

 variable. April, May. 



15. T. appendicnlatum, Loja. Glabrous, flaccid, diffuse: leaves 

 long-petioled: leaflets cuneate-obovate or obcordate, serrulate-spinulose, 

 mucronulate at apex: heads hemispherical, 1 in. or less in breadth: 

 fl. purple: calyx-teeth lanceolate-linear, entire, longer than the tube: 

 keel of the corolla rostrate-attenuate, longer than the wings. Lake Merritt, 

 Oakland, V. K. Chesnut. 



16. T. oligaiitlmiii, Steud. Pale green, glabrous, erect, slender, with 

 few ascending branches, 618 in. high: upper leaflets linear, acute, 1 in. 

 long, spinulose-serrate: peduncles filiform, 2^3 in. long, exceeding the 

 leaves: head small, 7 12-flowered; involucre reduced, laciniately divided: 

 fl. pale purple and white: 2-3 lines long: calyx-teeth ovate-acuminate, 

 pungent, entire, equal, shorter than the 10-striate tube. Var. Sonomeiise. 

 Smaller, the leaflets broader, oblong-cuneiform, truncate, cuspidate: 

 calyx-teeth subulate, aristate-pointed, equalling or even exceeding the 

 tube. Var. triflorum (T. triflorum, Greene, Pitt. i. 5). Leaflets as in 

 var. Sonomense nearly, but still broader and retuse: flowers fewer: 

 calyx-teeth triangular, acuminate, only a third as long as the tube. 

 Type common in ravines and other shaded places. Var. Sonomense in 

 Knights' Valley, Sonoma Co. Var. triflorum near Mt Diablo. 



