204 COMPOSITE. 



* Bracts of involucre joined into a toothed cup. 



1. L. glaberrima, DC. Stems weak, decumbent, 1 ft. long or less, 

 very glabrous: leaves linear, entire: heads nodding in bud: involucre 

 about 15-toothed: rays very short; all the corollas shorter than their 

 broadly linear pubescent achenes: pappus of 5 10 firm chaffy scales, 

 2 or 3 of them subulate-pointed or short-awned, the others not so. 

 Subaquatic herb of shallow winter pools on low plains or in depressions 

 among the hills; not very common. May, June. 



2. L. glabrata, DC. Stout, sparingly branching, 1 2 ft. high, 

 peduncles few, elongated, erect: leaves, at least the upper pairs, ovate- 

 lanceolate, coarsely but irregularly toothed, conspicuously connate at the 

 dilated base and forming an open cup rather than sheath: heads very 

 large, 1 in. wide: achenes dark, smooth, without pappus. Borders of 

 salt marshes only; not common. June. 



3. L. Californica, Lindl. More slender, almost diffusely branching, 

 the many and not elongated peduncles forming a corymbose top to the 

 herb as a whole: leaves narrow, entire, divaricately spreading, not dilated 

 or manifestly connate below: heads % in. wide. Abundant on low plains, 

 and even moist slopes of hills. Much more common than the last, and 

 inexcusably confounded with it for many years. May, June. 



4. L. chrysantha (Greene). Habit, foliage and flowers of the last, 

 but plant smaller: achenes obovate-oval, much compressed, surrounded by 

 a border of very short clavale closely packed hairs. Plains of the San 

 Joaquin; perhaps altogether outside of our district. April. 



5. L. conjugens, Greene. Only a few inches high; leaves narrowly 

 linear, only the lowest entire, the others cleft into several pairs of long 

 linear segments, these entire or toothed: involucral bracts united below 

 the middle only: achenes very small (1 line long) olive-green and polished: 

 pappus none. Subsaline soil near Antioch; closely connecting this 

 group and the following. April, May. 



* * Involucral bracts distinct. 



^Herbage often slightly villous- orfloccose-lomenlose; pappus 

 of pale se or awns, or both, or none. 



6. L. Fremoiiti (Torr.). Erect, slender, 810 in. high, only hirsute- 

 pubescent: leaves mostly palmately parted into linear lobes: involucre 

 broad; bracts 10 or 12; rays as many, the oval ligules not longer than 

 the width of the disk: pappus of 4 slender awns and as many or more 

 numerous small palese, or rarely none. Moist plains from Napa and 

 Solano counties southward. May. 



7. L. Burkei (Greene). Much like the last, but taller, 1-2 ft. high: 

 pappus of 8 10 minute entire acute palese and a single very long and 

 slender awn. Southern Mendocino Co.; to be expected in Sonoma. 



