320 COMPOSITzE. Laphamia. 



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

 uer, obloug 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 Guadalupe, near New Braunfels, Texas, Lindheimer. 



* * * Involucre 35-50-flowered, of numerous carinate-concave bracks, somewhat puberuleut or 

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

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

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

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

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

 involucre campauulate, about 35-flowered ; its Ijracts 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. — Caiions at Eeaver-dam, N. W. Arizona, pendulous from rock-crevices, 

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



-1— -i— Flowers yellow: leaves small, 2 to 4 lines long, mostly orbicular, more entire, the upper 

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

 spherical. 



L. megacephala, 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 slendcr-petioled : involucre 35-40- 

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

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

 i. 101 ; Eaton in Bot. King Exp. 164. Monothrix Stansburii, Torr. in Stansb. Rep. 389, 

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



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

 of the akene : head only G-8-flowered. 



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

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

 ovate, obscurely few-toothed (quarter-inch long including the petiole) : 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 campauulate cylindraceous throat : akenes 

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

 the akene, more than half the length of the corolla. — Gray, PI. Wright, ii. 106. — On the 

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



135. PERITYLiE, Benth. (Hept', around; TvXrj, a callus; the akenes 

 callotis-margined.) — Californian and Mexican herbs, the genuine species mostly 

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

 alternate, and small or middle-sized i^edunculate heads terminating the branches : 

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

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

 Bot. Calif, i. 39G. 



P. iNCAXA, 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 : transition 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, round-cordate in 



