ACHYRACH^INA. COMPOSITE. 393 



*«* We would here observe, that, since the preceding page was printed, 

 wild specimens of the well-marked Achyrach^na (California, iJoug^cts/) 

 liave fallen under our observation ; we having casually misplaced them, as De 

 CandoUe had done, in Cichoracese, with specimens of Calais. 



134. LAYIA. Hook. UfArn. hot. Beechey, p. 148 (1833), S^- 357 ; notofj?. 182. 



Eriopappus, Am. (1836)— Madaroglossa, DC. (1836)— Blepharipappura, partly, flboL 



Heads many-flowered ; the ray-flowers 10-15, ligulate, 2-3-toothed or 

 cleft, pistillate ; those of the disk tubular, perfect. Scales of the involucre 

 oblong or lanceolate, acute, equal, in a single series, foliaceous above ; the 

 base convolute and enclosing the ray-acbenia. Receptacle flat, pubescent, 

 chaffy at the margin ; the chaff in a single series between the ray and disk-flow- 

 ers, and resembling an inner row of involucral scales ; or rarely in 2-3 series. 

 Corolla of the disk with a short proper tube and an infundibuliform throat, 

 5-toothed ; the teeth and the tube sparsely hairy. Branches of the style in 

 the disk-flowers filiform, very acute, hairy above, at length exserted and re- 

 curved. Acheniaof the ray glabrous, linear-oblong, attenuate at the base, or 

 subclavate, more or less obcompressed, somewhat incurved, crowned with a 

 small protuberant disk, destitute of pappus ; of the disk linear-clavate, an- 

 gled, appressed-pubescent or villous, with a pappus of 10-20 equal bristly or 

 subulate awns, which are naked and scabrous-serrulate above, and plumose 

 or villous with very long weak hairs towards the base. — Annual or biennial 

 pubescent or hirsute and often glandular herbs (natives of California and 

 Oreo-on) ; with showy heads terminating the branches, and alternate sessile 

 linear or oblong leaves ; the upper usually entire, and the lowermost incisely 

 toothed or pinnatifid. Rays yellow or white ; the disk-flowers yellow. An- 

 thers brownish or purplish. 



Under the name of Layia, this genus was proposed by Hooker & Arnott several 

 years anterior to Madaroglossa, DC. ; but the authors themselves seem to have for- 

 gotten it, as they some time afterwards applied this name to a Chinese Leguminous 

 plant ; which however proves to be the Macrotropis of De Candolle. In the sup- 

 plement to Capt. Beechey's Voyage, Layia is continued for the present genus ; 

 while, by some inadvertency, these authors also state (in a note on p. 357) that they 

 retain the name for the Leguminous plant. 



§ 1. Rays yellow. — Madaroglossa, DC. 



1. L. gaillardioides (Hook. & Arn.) : decumbent, hispid throughout with 

 rather rigid spreading bristles ; leaves oblong-lanceolate ; the lower incisely 

 serrate, the upper entire ; the flower-branches somewhat elongated ; rays 

 12-15, obovate, 3-cleft at the apex, twice the length of the disk ; pappus ful- 

 vous. Hook, cy Arn. lot. Beechey, p. U8 (under Tridax? galardioides), &(■ 

 suppl. p. 357. 



Monterey, California, Mr. Lay; the Naturalist of Capt. Beechey's voy- 

 age. — This species (which we have not seen) appears to differ from the others 

 in the more copious linear-oblong chaff of the receptacle, occupying more 

 than one series. 



2. L. hieracioides (Hook. & Arn. 1. c.) : hispid throughout with spreading 

 rigid bristles ; leaves oblong-lanceolate, coarsely incised-serrate ; those of the 



VOL. 11. — 60 



