PEA FAMILY 



309 



peduncles filiform, 2 to 3 in. long, exceeding the leaves; heads very 

 small, 2 or 3 lines broad, 5 to 11-flowered; involucre reduced, lacini- 

 ately divided; flowers pale purple and white, 2 to 3 lines long; calyx 

 often purplish; calyx-teeth oblong-lanceolate, pungent, entire, shorter 

 than the 10-nerved tube. 



Brush-covered or wooded canon sides or edges of thickets in the 

 Coast Range hills: Berkeley; San Pablo Creek; near St. Helena. 

 Apr. Greene has a var. Sonomense, found in Knight's Valley, 

 Sonoma Co., with broader cuneate-oblong truncate cuspidate leaflets 

 and subulate-aristate calyx-teeth equaling or exceeding the tube. 

 Also a var. triflorum, found in the Mt. Diablo region, with broader 

 retuse leaflets, fewer flowers and triangular-acuminate calyx-teeth £ 

 as long as the tube. 



14. T. tridentatum Lindl. Glabrous annual; stems usually erect 

 or with decumbent base, 9 to 16 in. or even 2 ft. high; leaflets linear 

 or lanceolate, sharply serrate; heads 1 in. broad or more; involucre 

 laciniate, much shorter than the flowers; corolla bright purple, often 

 tipped with white; calyx-tube strongly 10-nerved, longer than the 

 teeth; these broad at base and abruptly narrowed into a subulate 

 spine, usually with a stout tooth on each side. 



Very common on hills and plains from the Sierra Foothills and the 

 Sacramento and San Joaquin Valleys westward to the seaboard and 

 southward to Southern California. The following is a little-known 

 plant whose exact status has not been determined: 



T. appen Die u latum Loja. Branches almost prostrate, \\ to 2\ ft. 

 long, sometimes forming a very broad mat; leaflets broadly obovate 

 and truncate, or obcordate, cuneate at base, 7 to 12 lines long; 

 peduncles about 3 in. long, twice exceeding the leaves (but the lower 

 leaves as long); heads large and involucre comparatively small; 

 calyx-teeth subulate-aristate, entire, twice as long as the tube; banner 

 deeply emarginate, keel abruptly contracted at apex into a slender 

 tip. (Not T. appendiculatum Greene). — Moist fields, Napa Valley. 

 May 12, 1895, Greene. 



15. T. obtusiflorum Hook. Diffusely branching, the stems 

 stout, purplish, 1 to 2 ft. long; herbage soft-pubescent throughout 

 and very clammy; leaflets linear or oblong-lanceolate, pectinately 

 serrate, f to 1} in. long; heads 1 in. or more broad, on long (often 

 4| in.) peduncles; calyx minutely roughish puberulent, its tube 

 oblong-campanulate, with 10 primary and as many intervening lesser 

 nerves, the latter vanishing above or forming reticulations; teeth 

 subulate-spinose, entire or sometimes slightly toothed, nearly equaling 

 the tube or scarcely \ as long; corolla white, with a dark purple spot 

 at the center. — (T. roscidum Greene.) 



Sandy stream beds in canons: Horse Mountain, Lake Co.; Vaca 

 Mountains, Solano Co., where it is a very rare plant; Mt. Tamalpais; 

 Mt. Diablo Range; and southward to Southern California. Easily 

 recognized by its clamminess, the whole plant on the driest summer 

 day seeming to the touch as if wet with dew. 



16. T. Wormskjoldii Lehm. Perennial by spreading root-stocks; 



