116 COMPOSITE. Gutierrezia. 



G. eriocarpa, Gray. Low or taller (a foot or two high) : receptacle obtusely high-conical : 

 pajjpus of 1 2 or more liuear-lauceolate or subulate aud mostly distiuct palete, about half the 

 length of the akeue. — PL Wright, i. 94. — Plains and prairies, S. and W. Texas, Wright, 

 Ilavard. (Mex.) 

 G. Berlandieri, Gray, Proc. Am. Acad. xv. 31, is an allied species of the northern part 



of Mexico, with a pappus of numerous minute paleaj, which do not surpass the silky hairs of 



the akene. 



§ 2. Pappus wanting in the ray-flowers : ligules comiiaratively long : habit of 

 the preceding subsection. — Hemiachyris, DC. 



G. Texana, Torr. & Grat. Annual, effusely much branched, 2 or 3 feet high : branches 

 slender, bearing the very numerous pedunculate heads in open compound panicles: invo- 

 lucre turbinate-campauulate, a line or two long ; rays 8 to 10 (3 or 4 lines long) ; disk-flowers 

 as many : akenes minutely pubescent ; those of the disk with a minute pappus of ovate or 

 subulate palea3, of length less than the breadth of the akeue. — Fl. ii. 194. Hemiachyris 

 Texana, DC. Prodr. v. 314. Brachijris microcephala, Hook. Ic. t. 147, not DC. — Sterile 

 plains, W. Arkansas to Texas. (Adjacent Mex.) 



22. AMPHIACHYRIS, Nutt. {Brachijris § Amphiachyris, DC.) — 

 ( 'A/x^t, about, or on both sides, and a-^vpov, chaff.) — As here constituted, tlie 

 genus consists of two rather low and fastigiately or diffusely much-branched and 

 erect glabrous plants, with entire leaves ; the first with the habit of Gutierrezia, 

 the second sufficiently different to form a subgenus (Amphipappus, Torr. & 

 Gray) : fl. yellow in late summer and autumn. 



A. dracunculoides, Nutt. Annual, rather low, effusely corymbiform, the slender 

 brandies and branchlets terminating in single pedunculate heads : leaves narrowly linear or 

 the uppermost filiform: involucre liemispherical or short-campanulate ; the bracts 10 or 12, 

 firm-coriaceous and whitish with abrupt green tips, mostly ovate or oval: rays 5 to 10, oval 

 or oblong, nearly as long as the involucre; disk-flowers 10 to 20, wholly sterile, the ovary 

 quite abortive ; tlieir pappas of 5 to 8 scarious almost aristiform smooth palete, cupulately 

 united at base and slightly dilated upward : akenes (of the ray) with a minute or obscure 

 corouiform pappus. — Trans. Am. Phil. Soc. vii. 313; Torr. & Gray, Fl. ii. 192. Brachyris 

 diacuncidoides, DC. PI. Ear. Genev. vii. 1, t. 1, & Prodr. v. 313. Brachi/ris i-amosissima, 

 Hook. Ic. t. 142 ; DC. Prodr. vii. 278, Gutierrezia Lindheimeriana, Scheele in Linn. xxii. 

 3:51. — Plains, Kansas to Texas. 



A ■ Frertiontii, Gray. Shrubby, a foot or two high, with rigid tortuous branches : leaves 

 short ( half or quarter-inch long ) , obovate or spatulate, commonly narrowed at base into a 

 margined petiole : heads mostly sessile and glomerate in small corymbosely disposed cymes ; 

 involucre campaniilate or oblong, 2 lines long ; the bracts 7 to 9, thin, mostly destitute of 

 green tips : rays 1 or 2, short : disk-flowers 3 to 6, with infertile glabrous ovary, and a 

 pappus of al)out 20 flattish denticulate-hispid tortuous bristles, some of them branching 

 or irregularly paleaceoixs-concreted at base : ray-akeues with a pappus of fewer and short 

 bristles or sqnamclhr, more united at base. — Proc. Am. Acad. viii. 633, «Sb Bot. Calif, i. 

 302. Am)}hi pappus Fremontii, Torr. & Gray in Jour. Bost. Soc. Nat. Hist. v. 4 ; Torr. 

 PI. Frem. 17, t. 9. — Arid deserts on the Mohave, S. E. California, Fremont, to S. W. Utah, 

 Palmer. 



23. GRINDELIA, "VVilld. {Prof. Hieronymus Grindel, of Riga and 

 Dorpat.) — Herbs, or some species shrubby, of coarse habit (American, mostly 

 of tlie U. S. west of the Mississippi) ; with sessile or partly clasping and usually 

 serrate rigid leaves, and rather large heads of yellow flowers terminating the 

 branches ; the narrow rays usually numerous, occasionally wanting ; central disk- 

 flowers not rardly infertile. Herbage often balsamic-viscid, the heads especially 

 so before and during anthesis (whence called Gum-plant in California) : fl. all 



