114 COMPOSIT.'E. Trilisia. 



Willd. Spec. iii. 1637; Miclix. Fl. ii. 93; Audr. Bot. Eep. t. 033; Dou in Brit. Fl. Gard. 

 ser. 2, t. 184; Torr. & Gray, Fl. ii. 76. Eupatoriiuii glastiJhUum, Bertol. Misc. v. 16, t. 4. — 

 Low pine barrens, near the coast, Virginia 1 to Florida and Louisiana. 

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

 leaves smaller, green ; radical lanceolate-spatulate ; small cauline ones oblong-lanceolate : 

 cvmules short-pediiucled, crowded iu a narrow panicle or thyrsus: akenes minutely pubes- 

 t-ent. — Anonymos paniculatus, Walt. 1. c. Liutris paniculata, Michx. Fl. ii. 93; Willd. Spec, 

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

 coast. 



Tribe III. ASTEROIDE^E, p. 52. 



19, GYMNOSP£lRMA, Less. (Tvfjii'6?, naked, cnrep/jia, seed, having no 

 pappu-;.) — Perennial herbaceous or suffrutescent plants, erect, glabrous, mostly 

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

 iu fasti •^'•lately 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. corijmbosam, multijlorum, 

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



20. XANTHOCi^PHALUM, Willd. (Hai/^o?, yellow, and Kec^aAv?, 

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

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

 the smaller-flowered species approaching the following genus. — Willd. 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. sericocArpum, Gray, Proc. Am. Acad. xv. 31, from San Luis Potosi, Mexico, has ca- 

 nescent akenes : iu 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 

 pednnculiform branchlets : involucre barely 3 Hues 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 au entire or obscurely denticulate coroniform border, without 

 proper pappus. — Proc. Am. Acad. viii. 632. Gutierrezia Wrightii, Gray, PI. AVriglit, ii. 78. 

 — S. Arizona and New Mexico, Wright, Thurber, Bigelow, 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 pinuatifid : heads corymbosely cymose, crowded : involucre liemi- 

 splierical, 4 lines liigh, very many-flowered ; the bracts narrow and with acute green tiph, 

 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 coronif<n-m-concreted at base. — 

 llothrock in Wheeler Rep. vi. 140; Hemsl. Biol. Centr.-Am. Bot. ii. 111. Gutierrezia? gym- 

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

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

 flowered very serrate-leaved ^Y. Benthamianum, Hemsl.) 



