322 COMPOSITiE. PerityU. 



Centr.-Am. Bot. ii. 210. P. Californica, Gray, Proc. Am. Acad. v. 159, not Benth; P. Acmella, 

 Gray, PI. Fendl. 77, & Bot. Calif. 1. c, with P- Californica, maiuly. Spilanthes Pseudo- 

 Acmella, Hook. & Arn. Bot. Beech. 150. Boltuniu § Dichetophora sp., Benth. & Hook. Gen. 



ii. 269. California, from Monterey?' southward, Lai/ ^- Collie, Coulter, Parish. (Mex.) 



Var. efFlisa. Very much branched from the annual root, paniculately floriferous: 

 leaves and heads smaller (the former half-inch or so, the latter only 2 lines high) : akenes 

 correspondingly small, narrowly obovate-obloug. — Santa Cutalina Mountaiu,s, S. Arizona, 

 Prinf/le. 



++ ++ Style-branches tipped with setaceous-filiform acute hispidulous appendages: rays with 



narrowligules, or wanting in one species : disk-corollas slender, with long and narrow tliroat : 



akenes oblong: pappus of a rather conspicuous crown of squamellse and one long and delicate 



awn: heads 5 lines high : bracts of the involucre linear: perhaps perennials or with lignescent 



base, not improbably all of one species. 



P. leptoglossa, Gray. Minutely puberulent or glahrate, not at all glandular : leaves 



roundish-subcordate, coarsely and doubly crenate-dentate (half to three-fourtlis inch long) : 



rays oblong-linear, 4 lines long : akenes (a line long) linear-oblong, with comparatively short 



hispid ciliation, the setiform awn shorter than the disk-coroUa. — PI. Pendl. 77 ; Bot. Calif. 



1. c. — " California," Coulter, more probably from Arizona. 



P. Parryi, Gkay. Minutely pubescent and obscurely viscid: leaves reniform-cordate, cre- 



nately dentate and often lobed (the larger inch broad) : rays oblong, barely 2 lines long: 



akenes (a line and a half long) oblong, strongly hirsute-ciliate : awn of the pappus nearly 



equalling the disk-corolla. — PI. Wright, ii. 106. — S. border of Texas, or on the Mexican 



side, in a cation of the Rio Grande below Presidio, Parri/. Also mountains on the Texan 



side, Havard. 



P. aglossa, Gbat, 1. c. Somewhat puberulent, oliscurely viscid ; leaves roundish, with 



- , subcordate or truncate base, mostly 3-5-cleft and coarsely dentate (the larger 2 inches broad) : 



bracts of the involucre very narrowly linear : rays none : akenes narrowly oblong, with 



rather short and dense hirsute ciliation : awn of the pappus equalling the disk-coroUa. — 



Canon of the Rio Grande, with or near the preceding. Parry. 



136. PERICOME, Gray. (Ilepi, around, and Ko^i-q, a tuft of hairs; a 

 coma of long hairs all round the margin of the akenes.) — PL AVright. ii. 82 ; 

 Benth. & Hook. Gen. ii. 406. — -The latter authors indicate a JMexican radiate 

 species, of anomalous character, which they associate with the typical 



P. caudata, Gray, 1. c. Rather tall widely branching perennial herb, strong-scented, very 

 minutely puberulent : leaves opposite, long-petioled, green and membranaceous, minutely 

 somewhat resinous-atomiferous, triangular-hastate (2 to 5 inches long),, with sparingly cre- 

 Tiate-dentate or entire margins, caudately long-acuminate, as also in less degree are the basal 

 angles : heads numerous in terminal corymbiform cymes, half-inch or less high ; flowers 

 golden yellow, conspicuously longer than the glabrous involucre: akenes linear-oblong; the 

 flat faces glabrous,, the nerviform margins densely villons-bearded : pappus a crown of 

 hyaline squamellas which are more or less connate and fimbriatc-lacerate at summit, the 

 fringe dissected into bristles or hairs somewhat simulating those of the margin of the akene; 

 also sometimes a slender awn from one or both margins of the akene. — Kocky caFions, &c., 

 S. Colorado, New Mexico, and Arizona; first coll. by Wright, Bigelou; &e. IT. late summer 

 and autumn. 



137. EAT0N:6LLA, Gray. (Prof. Darnel Cad;/ Eaton, author of 

 Ferns of N. America, the Composites of King's Expedition, iV:o., grandson of 

 Amos Eaton for whom was named the gonus Eatonia.) —Very floccose-lanate 

 annuals, of California and adjacent Nevada ; witji mostly alti'rn:ite leaves and 

 small sessile heads of yellow or white flowers: fl. spring or early summer. — 

 Bot. Calif, i. .j7'J, as subgenus under Aciinolcjiis ; Proc. Am. Acad. xix. 19. 



E. nivea, Grai-, 1. c. Depressed in a smitll tnft from a slender root, an inch or so high, 

 subcaulescent, densely leafy, white with long and loose wool : lea\ es obovate-spatulate, entire. 



