Perityle. COMPOSITE. 321 



outline, pedately cleft or parted and dissected into short linear lobes : heads subsessile, 3 or 

 4 lines high : involucre campanulate, of numerous narrow linear bracts : rays none : disk- 

 flowers about 20 (perhaps white) : akenes linear-oblong, minutely cinereous-hirsute, and the 

 cartilaginous margins somewhat more hirsute ; a short scabrous awn from one angle, of 

 nearly half its length, or this wanting: style-branches slender-subulate, not short and ob- 

 tuse, as said in Proc. Am. Acad. ix. 195. Laphainia dissecta, Torr. in PI. Wright, ii. 81. 

 Rocks at Presidio del Norte on the Rio Grande, between Texas and Mexico. 



2. Genuine species : pappus a crown of hyaline lacerate squamellae, either 

 somewhat united at base or distinct, rarely obsolete. 



# Suffruticulose perennial, with commonly dissected leaves: rays and perhaps disk-flowers also 

 white. 



P. COl'onopifolia, GRAY. Ciuereous-puberulent, many-stemmed from the woody base, a 

 foot or less high, slender, leafy: leaves small, somewhat pedately or pinnately once or twice 

 divided or parted into linear or narrow spatulate lobes, or some coarser and merely trifid : 

 heads disposed to be paniculate, 3 lines high : rays as long, broadly oblong, coarsely 3-toothed 

 at apex : style-tips slender-subulate : akenes narrowly oblong, glabrate on the faces, densely 

 hirsute-ciliate : awns 2, little shorter than the corolla. PI. Wright, ii. 82, & Bot. Mex. 

 Bound. 82. Rocks on mountain-sides, New Mexico and Arizona; first coll. by Wright. 

 Varies with roundish merely iucisely-cleft leaves. 



* # Herbaceous, chiefly and perhaps all with annual root, loosely branching, and bearing 

 scattered pedunculate heads : leaves often palmalely cleft. 



* Akenes thin-margined, hispidulous or hirsutely ciliate: crown of pappus minute or obsolete 

 and awns wanting: style-appendages short, acute. (Perhaps extra-limital.) 



P. Fitcllii, TORR. Viscid-pubescent: leaves .and involucre nearly of the following species : 

 akenes unknown : ovaries apparently destitute of pappus. Pacif. R. Rep. iv. 100. " Cali- 

 fornia, Rev. A. Fitch," in herb. Torr. Probably from the islands: imperfect, seemingly 

 winter specimens. (To this apparently is to be joined var. PALMERI, P. Emoryi of coll. 

 Pahner, no 44, which has the whole aspect and foliage of P. Californica, var. </, but akenes 

 narrowly oblong, somewhat falcately oblique, with a short pappus of numerous squamello; 

 united into an erose-dcuticulate crown. Guadalupe Island off Lower California.) 

 -i H Akenes callous-margined and densely ciliate with long beard : pappus-crown more con- 

 spicuous: awns rarely wanting. 



-H- Style-branches with short and obtuse or acute minutely hirsute appendages: rays 6 to 12, 

 short, the oblong or broader ligule little longer than the tube, perhaps always white. 



P. Californica, BENTII. Somewhat hirsutely pubescent, also viscid and glandular : leaves 

 broadlv ovate or roundish-cordate, incisely lobed or more deeply 3-5-cleft and the lobes 

 coarsely dentate : heads fully 3 or 4 lines high and broad : bracts of the involucre narrowly 

 oblong : akenes oblong, densely hispid-villous on the margins, crowned with conspicuous 

 squamellae, and with a single more or less barbellate awn of about the length of the akene. - 

 Bot. Sulph. 23, t. 15. P. Emoryi, Torr. in Emory Rep. (1848), 142 ; Gray, Bot Calif, i. 397, 

 form with usually more rounded lobed and incised leaves. Desert-region of the Mohave 

 and Gila, S. E. California and W. Arizona. (Lower California, Guadalupe Island, &c. 

 Now found by many collectors.) 



Var. nuda, GRAY, Bot. Calif. 1. c., under P. Emori/i. Awn of the pappus none : 

 otherwise as in the P. Emori/i iorm. P. wm7, Torr. Pacif. R. Rep. iv. 100. With the 

 aristate form and commoner. (Lower Calif.) 



P. plumigera, GRAY. Flowering branches only seen, small-leaved, viscid-glandular: heads 

 much smaller than in the preceding (narrowish, barely 3 lines high) : akenes oval-oblong:, the 

 margins very densely long-villous : awn solitary, longer than the akeue, sparsely barbellate- 

 hispid. PI. Fendl.'l. c. " California," probably Arizona, Coulter. Possibly a late-flower- 

 ing form of the preceding. 



P. microglossa, BENTH. Merely puberulent, obscurely glandular above : leaves broadly 

 ovate with subcordate or truncate' base, or upper somewhat hastate, incis.-ly dentate,^often 

 3-5-lobed : heads 3 lines high : akenes obovate or obovate-oblong, with broad summit, villous- 

 ciliate margins, and a pair of delicate awns, which barely equal the breadth of the akene and 

 are twice or thrice the length of the crown of squamelke. Bot. Sulph. 119; Hemsl. Biol. 



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