CATALOGUE. 169 



simple or branching toward the summit ; leaves 1-2-ternately parted, the 

 divisions spatulate or oblanceolate, obtuse, simple or lobed; scales of the 

 involucre equal, acuminate, in 2-3 series; ray-flowers about 15 (disk-flowers 

 many) ; blade toothed or lobed ; tube of the disk-flowers externally glandu- 

 lar-hairy ; achenia narrowly turbinate or clavate, black, slightly quad- 

 rangular, smooth, ribbed or striate, and longer than the corolla; pappus 

 none —Arizona (812, 609). 



Palafoxia lineaeis, Lag. (vide Botany of Fortieth Parallel, p. 424). — 

 Arizona. 



Palafoxia Hookeeiana, T. & G. !, probably var. subradiata, T. & G.— 

 6-1 2' high, simple or branched ; leaves linear or linear-lanceolate, hirsute, 

 1-1 £' long; pedicels and flowers viscidly glandular-hairy; scales of invo- 

 lucre lanceolate, acute, sub 2-seried ; rays variable, large or small, regularly 

 or irregularly 3 cleft ; pappus (ray) reduced to small obtuse scales, half a 

 line long; achenia sub 4-angled, hairy, broadly clavate; disk-flowers deeply 

 5-parted ; tube long and slender, or short and thick ; pappus of 5-8 lanceo- 

 late or oblong scales, which are nearlyas long as the hairy, clavate achenia. — 

 A plant which appears to be variable in almost everything about the flower 

 except the disk-achenia. Deserts of New Mexico, Loew. 



Poeophyllum* maceocephalum, DC. — Annual, erect, glabrous ; lower 

 leaves linear, upper broadly oval (all petioled and glaucous) and sinuate- 

 dentate ; marginal glands nearly a line long and half as wide ; flowers 

 solitary, terminating the pedicels, which are hollow and dilated above; scales 

 of the involucre linear, 10" long, with one or two lines of glands 1£" long 

 and 4" wide ; achenia clavate, hairy ; pappus fulvous, rough, with delicate 

 hairs, nearly or quite as long as the slender flower-tube ; limb of the flower 

 dark brown. — A striking species, found usually on or near limestone rocks. 

 Sanoita Valley, Arizona, at 4,500 feet altitude (682). 



* POROPHYLLUM, Vaillaut. — Head several- to many-flowered, with all the flowers perfect. Iu volucre 

 cylindrical or cyliudraceous, of 5 to 10 ohlong or linear equal scales in a single series. Eeceptacle small, 

 naked. Corollas with a slender or filiform tube and a narrow 5-cleft limb. Style-branches slender, 

 tipped with a subulate- filiform hispid appendage. Akenes long and slender, nearly terete, striate or 

 angled. Pappus of copious, rather rigid, scabrous, capillary bristles, about the length of the corolla.— 

 Herbs glabrous and often glaucous; with slender branches terminated by pedunculate heads of yellow, 

 whitish, or purplish flowers, and alternate, or below, opposite leaves ; these and the scales of the involucre 

 marked by scattered immersed oil-glands, iu the manner of Tagetes, &,c, therefore stroug-sceutcd.— Gray, 

 Fl. Cal. 1, p. MS. 



