HELENIOIDE.E. 203 



campanulate limb; their style undivided, with capitate apex; their 

 ovaries abortive. Achenes (of the ray) pyriform, obscurely 8 10-ribbed, 

 with small areola and no pappus; the surface bearing minute papillae 

 which develop mucilate when wet. 



1. B. Californicum (DC.), Torr. & Gray. A span high, diffusely 

 branching, flaccid, glabrous: leaves alternate, pinnately parted into 

 narrowly linear entire lobes: expanded heads % in. broad: ligules pale 

 yellow within, brownish without: disk-flowers shorter than the involucre: 

 style-branches of fertile flowers broad. Early vernal plant of the valleys 

 of the Mt. Diablo Range, and plains beyond. March, April. 



50. CHJE\ACTIS, De Candolle. Compound-leaved herbs, often more 

 or less woolly, with discoid heads mostly solitary and pedunculate. 

 Involucre campanulate, the linear bracts equal, uniserial, herbaceous. 

 Receptacle flat, naked. Corollas (yellow in ours) with short tube, long 

 narrow throat, and short teeth; but those of the outer circle more 

 ample, approaching the nature of rays. Achenes slender, smooth. 

 Pappus of hyaline nerveless palea3. 



1. C. glabriuscula, DC. Annual, seldom a foot high, thinly floccose, 

 at length glabrate; peduncles long, stout: heads % in. high: bracts of 

 involucre thickish, glabrate, obtuse: marginal corollas ample, much 

 exceeding the others : pappus of 4 equal narrowly oblong acutish palese. 

 Plains of the lower San Joaquin. April June. 



51. RIGIOPAPPUS, A. Gray. Heads with short narrow ligulate 

 rays; all the flowers yellow. Involucre turbinate-campanulate, its bracts 

 nearly linear, equal, rather rigid, involute in age. Disk-corolla small, 

 with short tube, long narrow throat, and 35 short erect teeth. Style 

 branches with slender-subulate hispidulous appendage and short linear 

 stigmatic part. Pappus alike in disk and ray, of 35 opaque paleaceous 

 awns; the linear pubescent achene transversely rugose. 



1. R. leptocladus, Gray. Slender erect annual, 612 in. high, 

 simple below, above with few slender corymbose branches : leaves alter- 

 nate, narrowly linear, sessile, erect, entire, hirsutulous or glabrate, those 

 of the filiform branchlets subulate: paleaB of pappus % % as long as 

 the long slender rugulose achene. Open glades among sparsely wooded 

 hills. May. 



52. LASTHENIA, Cassini. Mostly annuals and low, from glabrous 

 to slightly flocculent. Leaves opposite. Heads middle-sized, on slender 

 peduncles. Receptacle conical to subulate, muricate with projecting 

 points on which the achenes are inserted. Involucres hemispherical, 

 campanulate, or oblong Rays oval or oblong. Disk-corollas with 

 slender tube and campanulate 5- toothed limb. Achenes linear, subclavate, 

 or linear-cuneate, more or less flattened or angled, naked at summit, 

 with or without a paleaceous or more or less awn-like pappus. 



