Palafoxia. COMPOSITjE. 369 



shorter and obtuser pappus. — This is the most showy species of the genus, 

 and would be very ornamental in cultivation. 



2. P. Texan a (DC): leaves linear-lanceolate, 1-nerved, or the lower 3- 

 nerved ; hends (rather small) many-flowered, discoid, 2 or 3 of the marginal 

 flowers usually pahnate or irnperfecily radiate, not exceeding; the disk ; scales 

 of the involucre 8-12, lanceolate, strigose-puberulent and sligluly glandular, 

 scarcely iiTibricated ; limb of the corolla 5-cleft to the base ; papjjusofihe 

 disk-flowers of 8 lanceolate-ovate acute or cuspidate scales, rather shorter than 

 the obpyramidal hairy achenium ; in the marginal flowers broadly ovate, 

 mostly obtuse, much shorter. — DC. ! prodr. 5. p. 125. 



Texas, Berlandier ! Drummond! — 2| ? A more slender plant than the 

 preceding, scarcely glandular, with much smaller heads : the flowers appar- 

 ently flesh-colored ; the linear lobes of the corolla rather longer than the al- 

 most glabrous tube. Scales of the involucre scarious at the tip, partly em- 

 bracing the exterior achenia. 



§ 2. Heads^discoid, ivith the Jloivers and papjms all similar ; the latter of short 

 and rounded scales {nerves of the lobes of tJte corolla intramarginal) : scales 

 of the involucre nearly in a single series, equal, somewhat herbaceous, partly 

 embracing the exterior achenia. — FiiORESTiNARiA. 



3. P. callosa : strigose-cinereous ; the diffuse and dichotomous slender pe- 

 duncles glandular; leaves narrowly linear, 1-nerved; heads (small) turbi- 

 nate, 10-12-flowered; scales of the involucre 8-10, oblong, obtuse; limb of 

 the corolla 5-cleft to the base ; the oblong-linear lobes nmch longer than the 

 tube; scales of the pappus 8, roundish-obovale, about one-fourth the length 

 of the obpyramidal minutely hairy acheniunr. — Sievia callosa, Nuit. ! in 

 jour. acad. Philad. 2. p. 121 ; Bart. fl. Amer. Sept. t. 46. Florestina cal- 

 losa, DC. ! prodr. b. p. 6bb. 



Western Arkansas, Nuttall I Texas, Drummond! Dr. Riddell! — (l) ? 

 Stem slender, a foot high, corymbose at the summit. Leavesoften 2 inches 

 long, a line wide, frequently fascicled in the axils. Involucre 3 lines long; 

 the scales slightly scarious at the apex. Flowers purple. Pappus unif(>rni 

 and resembling that of the ray-flowers in P. Hookeriana : the scales opaque 

 and thickened in the centre and at the base, dilated above, with denticulate- 

 lacerate margins. — The style is exactly as in Palafoxia, and very different 

 from that of Florestina ; and the leaves are undivided. 



§ 3. Heads discoid, ivith the flowers and paiipus all similar ; the latter oflan^ 

 ceolate pointed scales {nerves of the lobes of the corolla marginal) : scales of 

 the involucre somewhat scarious or membranaceous, flat, in 2-3 series ; a 

 fewofthe exterior small and bracteolate. — Polypteris, Nutt.* 



4. P. integrifolia : stem slightly scabrous, fastigiate-corymbose above ; 

 leaves linear-lanceolate, 1-nerved, scabrous; heads (rather large) many- 

 flowered ; scales of the involucre 10-15 ; the inner oblong, obtuse ; the exte- 

 rior linear-lanceolate, loose ; limb of the corolla 5-clcft below the middle ; 

 scales of the pappus 8-9 (12-14, Nutt.), linear-lanceolate, attenuate-acumi- 

 nate, about the length of the slender slightly pubescent achenium. — Poly- 

 pteris integrifolia, 'i\M/^ / gen. 2. p. 139; Ell.! sk. 2. p. 314, not of X>C. 

 Paleolaria fastigiata, DC. prodr. b. p. 125. 



* The character of Polypteris in DC. prodr. 5. p. 659, is drawn from a rayless state 

 of Gaillardia lanceolata. 



VOL. II. — 47 



