Layia. COMPOSITE. 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, the 

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

 t. 326. California, from the Lower Sacramento Vallev 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 the 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 with 

 straight villous hairs : akenes of the ray also pubescent ! Fl. ii. 394 ; Gray, Bot. Calif. 1. c. 

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

 beach, from San Diego to Marin Co , Nuttull, Parry, Bigelow. 



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



-i Pubescence hirsute rather than hispid : inner hairs on the pappus woolly and interlaced in the 

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



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

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

 pus white or whitish, its copious villous hairs much shorter than the aristiform bristles. 

 Gray, PI. Fendl. 103, & Bot. Calif, i. 309. M adaroglossa elegans, Nutt. Trans. Am. Phil. Soc. 

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

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



-f -f Pubescence hispid ; the stem often dark-spotted at the base of the papillae of the stronger 

 bristles: bar son the pappus less copious, all straight and erect: steins and branches mostly 

 upright. 



L. hieracioides, HOOK. & ARN. 1. c. Leaves from linear to oblong, mostly laciniate-den- 



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



Gray, 1. c. Madaroglossa hieracioides, DC. 1. c. California, from San Mendocino Co. to 



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

 L. gaillardioid.es, HOOK.' & ARX. Leaves more commonly laciniate-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? galllardioides or Layia, Bot. Beech. 148); Torr. 



& Gray, Fl. ii. 393; Gray, Bot. Calif, i. 369. Common in W. California, from Meudocino 



Co. to Tejon ; first coll. by Lay. 



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

 rarely wanting : otherwise as in the preceding. - Callichroa, Fisch. & Meyer, 

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



Li. pentach&ta, GRAY. Somewhat hirsute and viscid-pubescent, hardly hispid, erect, a 

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

 mostly pinriatifid and the lower laciuiately 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., Biyelow, 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. Fendl. 1. c. ; Bot. Calif. 1. c. Callichroa plati/ahssn, Fisch. & Meyer, 

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

 & Am. I.e. ; Hook. Bot. Mag. t. 3719 ; Torr. & Gray, Fl. ii. 395. Madarmjlossa (Callichroa) 

 hirsuta & angiisti folia, Nutt. Trans. Am. Phil. Soc. I.e. Common in low grounds through- 

 out W. California. 



Var. breviseta, GRAY, J3ot. Calif, i. 370. Pappus only half the length of corolla and 

 of the young akene : cauline leaves mostly pinnatifi 1. S. California, in the vicinjty of Los 

 Angeles, Bigdow. 



