114 COMPOSITE. TriUsia. 



WilM. Spec. iii. 1637 ; Michx. Fl. ii. 93 ; Andr. Bot. Eep. t. 633 ; Don in Brit. Fl. Gard. 

 ser. 2, t. 184; Torr. & Gray, Fl. ii. 76. Euixitonum glastifoUum, Bertol. Misc. >'. 16, t. 4.— 

 Low pine barrens, near the coast, ^^irginia 'i to Florida and Louisiana. 

 T paniculata, Cass. 1. c. Viscid-pubescent or tlie foliage glabrate, a foot or two high: 

 'leaves smaDer,' green ; radical lauceolate-spatulate ; small cauline ones oblong-lanceolate : 

 cvmules short-peduncled, crowded in a narrow, panicle or thyrsus :. akenes minutely puljes- 

 cent. -Anonymos paniculatus, Walt. 1. c. Liatris paniculata, Michx. Fl. ii. 93 ; WiUd. Spec, 

 iii. 1637; Torr. & Gray, Fl. ii. 76. — Damp pine barrens, Virginia to Florida, near the 

 coast. 



Tribe III. ASTEROIDE^, p. 52. 



19. G-YMNOSPifiRMA, Less, (rn/ivo's, naked, o-Trep/xa, seed, having no 

 pappu?.) — Perennial herbaceous or sufErutescent plants, erect, glabrous, mostly 

 glutinous ; with alternate entire narrow leaves, and small heads of yellow flowers 

 in fastigiately corymbose glomerate cymes. Involucre about 2 lines long : ligules 

 very small and short. — Syn. 194; DC. Prodr. v. 312, excl. § 2. — Founded on 

 Selloa glutinosa, Spreng., said to come from S. Brazil, with infertile disk-flowers, 

 to which DeCandolle added three Mexican species ; but these are all reducible 

 to one, viz. : ^ — 



-G. corymbosum, DC. "Woody at base, 2 or 3 feet high: leaves from oblong-lanceolate 

 'to linear ; lower ones distinctly 3-nerved : flowers of the ray 5 to 9, of the disk mostly fewer, 

 all fertile. — Torr. & Gray, Fl. ii. 192; Gray, PI. Wright, ii. 94. G. corymbosum, multiflorum, 

 & scoparium, DC. 1. c — Rocky soil, S. Texas; fl. autumn. (Mex.) 



20. XANTHOC:fiPHALUM, Willd. CEavOo?, yellow, and K€<j>aXij, 

 head.) — Herbaceous or suffruticose plants (chiefly Mexican) ; with alternate 

 entire or lobed leaves, and yellow flowers in scattered or loosely cymose heads ; 

 the smidler-flowered species approaching the following genus. — AYilld. in Gesel. 

 Nat. Fr. Berl. 1807, 140; Benth. & Hook. Gen. ii. 249. Xanthocoma, HBK. 

 Nov. Gen. & Spec. iv. 310; t. 412 ; DC. Prodr. v. 311. 



X. sericocAkpum, Gray, Proc. Am. Acad. xv. 31, from San Luis Potosi, Mexico, has ca- 



nescent akenes : in all other species they are glabrous or only sparsely pubescent. Our species 



are annuals. 



X. "Wrightii, Gray. Very glabrous, not glutinous : stems slender, a foot or two high, 

 corymbosely paniculate at summit : leaves linear, entire : heads rather numerous, terminating 

 pedunculif orm branchlets : involucre barely 3 lines high and wide ; the bracts broad, obtuse, 

 or apiculate with a short green tip : rays 12, oblong : style-appendages linear-lanceolate, acute ; 

 akenes all surmounted by an entire or obscurely denticulate coroniform border, without 

 proper pappus. — Proc. Am. Acad. viii. 632. G uiierrezla Wriqhtii, Gray, PI. Wright, ii. 78. 

 — S. Arizona and New Mexico, Wright, Tlinrher, Bif/filow, Greene. 



X. gymnospermoides, Benth. & Hook. 1. c. Glutinous when young, occasionally with 

 some deciduous tomentum : stem stout, 2 to 4 feet high ; leaves oblong-lanceolate with a 

 tapering base, sometimes sparingly denticulate ; the lowest often broader, petioled, occa- 

 sionally incised and even pinnatifid : heads corymbosely cymose, crowded : involucre hemi- 

 spherical, 4 lines high, very many-flowered; the bracts narrow and with acute green tips, 

 not very unequal : flowers deep golden-yellow : rays 30 to 50, only 2 lines long : style-append- 

 ages ovate : pappus in the ray none ; in outer disk-flowers setulose-coroniform ; in central 

 and less fertile flowers of several unequal awns and mostly coroniform-concrcted at base. — 

 Rothrock in Wheeler Rep. vi. 140; Hemsl. Biol. Centr.-Am. Bot. ii. HI. Gntierrezia ? tjijm- 

 nospermoides, Gray, PI. Wright. 1. c. ; Hook. Bot. Mag. t. 5155. — Banks of streams, Arizona, 

 first coU. by Wright. (Mex., Parr// & Palmer, which has been wrongly referred to the larger- 

 flowered very serrate-leaved X. Benthamianum, Hemsl.) 



