160 University of California Publications in Botany. [VOL. 3 



5. L. platyglossa (F. & M.) Gray, PI. Fendl. 103 (1849). 

 Callichroa platyglossa F. & M., Ind. Sem. Petr. ii. 31 (1835). 

 Layia platyglossa breviseta Gray, Bot. Calif, i. 370 (1876). Ble- 

 pharipappus platyglossus Greene, Pitt. ii. 246 (1892). TIDY 

 TIPS. 



Simple or more commonly branching below, erect or some- 

 times diffuse, 2 to 6 or 8 dm. high: herbage short-hirsute and 

 usually with some small stipitate glands: basal leaves oblong, 

 toothed or pinnatifid, the rameal narrower and either toothed or 

 entire, the uppermost linear and entire : peduncles turbinate- 

 thickened beneath the head : involucral bracts linear, with broad 

 tips: rays 5 to 13, sulphur-yellow, the tips commonly white, 1 

 to 1.2 cm. long : disk-achenes somewhat flattened, densely clothed 

 with appressed silky hairs: pappus of 15 to 20 upwardly sca- 

 brous stout awn-like bristles, nearly as long as the corolla, neither 

 villous nor plumose, rarely wanting. 



Common throughout western California; east barely to the 

 edge of the Colorado Desert. Mrs. Brandegee has gathered 

 specimens near San Diego to illustrate variation in coloring: 

 in some the rays vary from lemon-yellow to orange-yellow on a 

 single plant, while others have yellow rays with purple tips. 

 Here also the pappus is occasionally sepaloid, the bristles being 

 broad, thin, and yellowish. 



L. JONESII Gray, with pale-yellow ligules and a pappus of 

 oblong-ovate naked paleae, grows in San Luis Obispo Co., not 

 far from our northern boundary. 



58. ACHYRACHAENA Schauer. 



Soft-pubescent annual with narrow leaves, the lower opposite, 

 and rather large heads terminating the few erect branches. In- 

 volucre oblong-campanulate, its bracts lanceolate, each enfolding 

 a ray-achene. Bracts of the receptacle membranous, in a single 

 series between ray and disk. Kay-flowers 5 to 10, little exceed- 

 ing the disk; their ligules short and broad, palmately 3-cleft. 

 Kay-achenes fertile, linear-clavate, all the ribs or the alternate 

 scabrous. Disk-achenes with a pappus of about 10 silvery scales. 

 the outer as long as the achene, the inner nearly twice as long. 



