320 COMPOSIT.E. Laphamia. 



L. Lindheimeri, Gray. Stems a foot or less high from a thick woody base : leayes thin- 

 ner, tibloijo- or ovate, glabrous, few-toothed or some entire, contracted at base into a short 

 petiole : heads loosely cymose : rays 3 to 6, very short, sometimes none : pappus a single 

 slender bristle equalling the proper tube of the corolla. — PI. Wright, i. 101. — llocky banks 

 of the Giiadalupe, near New Braunfels, Texas, Lind/teimer. 



* * * Involucre 35-50-flowered, of numerous carinate-concave bracts, somewhat puberulent or 

 glandular on the back: herbage minutely puberulent: leaves tliickish. 

 •h- Flowers said to be white : leaves mostly opposite, numerous up to the heads, dentate. 

 L. Palmeri, Gray. Scabrous-puberulent : leaves broadly ovate or deltoid-rotund, rigid, 

 coarsely 5-7-dentate or laciniate-lobed, half-inch long, veiny, abruptly short-petioled : heads 

 somewhat crowded on the fastigiate flowering branches, little surpassing the upper leaves : 

 involucre campanulate, about 35-flowered ; its bracts linear, somewhat pubescent : rays none : 

 pappus a bristle of the length of the akene and a little shorter than the corolla. — Proc. Am. 

 Acad. xiii. 372. — Canons at Beaver-dam, N. W. Arizona, pendulous from rock-crevices, 

 Palmer, who notes that the flowers are " creamy white." 



-1^ -)— Flowers yellow: leaves small, 2 to -1 lines long, mostly orbicular, more entire, the upper 

 alternate, scattered: heads solitary and naked, terminating the loose branchlets, nearh' hemi- 

 spherical. 

 L. megacsphala, Watsox. Base of .stem and lower leaves unknown ; those of flowering 

 branches all very small, alternate, short-petioled : involucre about 50-flowered ; its bracts 

 lanceolate-linear, minutely glandular: rays none: pappus none. — Am. Nat. vii. 301. — 

 S. Nevada, Wheeler. 

 L. Stansburii, Gray. Stems slender and lax from a woody base : lower leaves opposite 

 and on petioles of their own length ; upper alternate, also slender-petioled : involucre 35-40- 

 flowered, its bracts fewer and broader, lanceolate-oblong, nearly glal)rous : rays 6 to 10, con- 

 spicuous, oblong : pappus a bristle somewhat .shorter than the disk-corolla. — PI. Wright, 

 i. 101 ; Eaton in Bot. King Exp. 164. Monolhrix Stanshnril, Torr. in Stansb. Rej). 389, 

 t. 7. — Rocks on Stansbury Island, &c., Salt Lake, Utah; first coll. by Stansbunj. 



§ 3. DiTiiRix. Pappus a pair of stouter naked bristles, one from each angle 

 of tlie akene : head only 6-8-Howered. 



L. bisetosa, Torr. Ilispidulous-puberulent, minutely resinous-atomiferous and punctate: 

 stems 1 to 3 inches high from the woody base : leaves mostly alternate, coriaceous, spatulate- 

 ovate, ob.scurely few-toothed (quarter-inch long including the ])etiole) : heads solitary and 

 sessile: rays none: involucre (3 lines long) with bracts broadly linear, slightly pubescent, 

 carinate-concave at base: flowers proportionally large: corolla (whitish or pale yellow?) 

 with glandular tube one-third the length of the campanulate cylindraceous throat : akeiies 

 hispidulous-puberulent, the narrow marginal nerves naked : rigid awns rather shorter than 

 the akene, more tlian half the length of the corolla. — Gray, PI. Wright, ii. 100. — On tlie 

 Rio Grande, Texas, in a canon below Presidio del Norte, Parry. 



135. PERITYLE, Benth. (riepi', around; rvX-q, a callus; the akenes 

 callou.s-mar^ined.) — Caliiorni:xn and Mexican herbs, the genuine species mostly 

 annuals ; Avith petiolate dentate or palmately-lobed leaves, lower opposite, upper 

 alternate, and small or middle-sized pedunculate heads terminating the branches : 

 disk-llovpers yellow (or sometimes white?) : rays when present yellow or white. — 

 Bot. Sidph. 23 & 119, t. 15 ; Gray, PI. Fendl. 77, Proc. Am. Acad. ix. 191, & 

 Bot. Calif, i. 39 G. 



P. INCANA, Gray, Proc. Am. Acad. xi. 78, from Guadalupe Island, off Lower California, is 

 an outlying anomalous species : all the others are as follows. 



§ 1. Crown of the pappus an entire or undulate firm and shallow border: 

 akene hardly ciliate : suffruticulose : tranoition to Laphamia. 



P. dissecta, Gray. Dwarf, 3 or 4 inches high from the woody base, cinereous-pubescent, 

 very leafy : leaves with blade (quarter-inch long) equalled by the petiole, rouud-cordate iu 



