Layia. COMPOSITJE. 315 



L. heterotricha, Hook. & Arn. 1. c. Generally larger and more erect: dark glands 

 copious: rays 10 to 18: long-villous hairs of the pappus-bristles less abundant, all erect, tlie 

 inner woolly ones wanting. — Gray, 1. c. Madaroghssa heterotricha, DC. 1. c. ; Hook. Ic. PI. 

 t. 326. — California, from the Lower Sacramento Valley southward. 



* * Rays apparently white, but small and inconspicuous, little if at all surpassing the disk : pappus 

 dull white. 



L. carnosa, Torr. & Gray. Dwarf, barely a span high, diffusely branched from tlie base, 

 somewhat pubescent : dark glands few or wanting : leaves succulent, spatulate to linear- 

 oblong, an inch or less long, some sinuate-pinnatifid : pappus-bristles sparsely plumose Avith 

 straight villous hairs : akenes of the ray also pubescent ! — Fl. ii. 394 ; Gray, Bot. Calif. I. c. 

 Madaroghssa carnosa, Nutt. Trans. Am. Phil. Soc. vii. 393. — Sands of the California sea- 

 beach, from San Diego to Marin Co., Nuttall, Parry, Blgelow. 



* * * Rays as well as disk-flowers yellow, or the former rarely white-edged. 

 •(— Pubescence hirsute rather tlian hispid : inner hairs on the pappus woolly and interlaced in the 

 manner of L. ylunJulosa, but mostly less densely so. 



L. elegans, Torr. & Gray, 1. c. Diffuse: stipitate glands small and sparse: leaves linear; 

 the lower pinnately tootlied or parted into linear lobes: rays 10 to 12, half-inch long: pap- 

 pus white or whitish, its copious villous hairs mucli shorter tlian the aristiform bristles. — 

 Gray, PI. Fendl. 103, & Bot. Calif, i. 369. Madaroghssa ehgans, Nutt. Trans. Am. Phil. Soc. 

 vii. 393. — Common from Santa Barbara Co. southward to San Bernardino, California, 

 Nuttall, Cleveland, Parish, &c. ; also in the northern part of tlie State at Ukiah, Kellogg. 

 •i— H— Pubescence hispid ; the stem often dark-spotted at the base of the papilhe of the stronger 



bristles: haiis on the pappus less copious, all straight and erect: stems and branches mostly 



upright. 



L. hieracioldes, Hook. & Arn. 1. c. Leaves from linear to oblong, mostly laciniate-den- 

 tate : rays 10 to 15, small and short, little surpassing tlie disk: pappus dull white or rusty. 

 — Gray, 1. c. ]\fadaroglossa hieracioides, DC. 1. c. — California, from -San Mendocino Co. to 

 Santa Barbara, &c. ; first coll. by Douglas. 



L. gaillardioides, Hook. & Arn. Leaves more commonly laciuiate-pinnatifid : heads 

 usually larger: rays 10 to 20, orange-yellow, half to three-fourths inch long: pappus dull 

 white or rusty. — Bot. Beech. 357 {Tridax? gaillardioides or Lai/ia, Bot. Beech. 148); Torr. ■ 

 & Gray, PI. ii. 393; Gray, Bot. Calif, i. 369. — Common in W. California, from Mendocino 

 Co. to Tejon ; first coU. by Lag. 



§ 2. Callichroa. Gray, 1. c. Pappus of 5 to 25 naked aristiform bristles, or 

 rarely wanting : otherwise as in the jireceding. — Callichroa, Fisch. & Meyer, 

 Ind. Sem. Hort. Petrop. 1. c. 



Li. pentacheeta, Gray. Somewhat hirsute and viscid-pubescent, hardly hispid, erect, a 

 foot or two high, paniculately branched ; stipitate glands minute and sparse : cauline leaves 

 mostly pinnatifid and the lower laciniately bipinnatifid ; the lobes narrowly linear : rays 

 ample, half-inch or more long, golden- or orange-yellow : disk-akenes minutely pubescent or 

 glabrate : pappus of 5 or rarely fewer rigid and smooth bristles, sometimes even wholly 

 wanting in certain specimens apparently of very same parentage. — Pacif. R. Rep. iv. 108, 

 t. 16; Bot. Calif, i. 369. — California, along the foothills of the Sierra Nevada, from Placer 

 to Fresno Co., Bigehw, Bolander, Parry. 



L. platyglossa, Gray. Usually more hirsute and lower : stipitate glands small and sparse : 

 cauline leaves linear, simply pinnatifid into short linear lobes, most of the upper entire . 

 rays half-inch long, light yellow, commonly with white tips to the lobes : disk-akenes silky- 

 hirsute: pappus of 15 to 20 upwardly scabrous stout awn-like bristles, only a little shorter 

 than the corolla. — PI. Fendk 1. c. ; Bot. Calif. 1. c. Callichroa platyi/hssa, Fisch. & Meyer, 

 Ind. Sem. Hort. Petrop. 1. c, & Sert. Petrop. t. 5 ; Don, Brit. H. Card. ser. 2, t. 373 ; Hook. 

 & Arn. 1. c. ; Hook. Bot. Mag. t. 3719 ; Torr. & Gray, Fl. ii. 395. Madaroghssa ( Callichroa ) 

 hirstita & angustifolia, Nutt. Trans. Am. Phil. Soc. I.e. — Common in low grounds through- 

 out W. California, where it is called Tidy-tips. 



Var. breviseta, Gray, Bot. Calif, i. 370. Pappus only half the length of corolla and 

 of the young akene : cauline leaves mostly pinnatifid. — S. California, in the vicinity of Los 

 Angeles, Bigehw. 



