116 COMPOSITES. Gutierrezia. 



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

 pappus of 1 2 or more linear-lanceolate or subulate and mostly distinct palece, about half the 

 length of the akene. PI. 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 miuute paleas, which do not surpass the silky hairs of 

 the akene. 



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

 the preceding subsection. ffemiachyris, DC. 



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

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

 lucre turbiuate-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 paleas, of length less than the breadth of the akene. Fl. ii. 194. Hemiaclujris 

 Texana, DC. Prodr. v. 314. Brachyris microcephula, Hook. Ic. t. 147, not DC. Sterile 

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



22. AMPHIACHYRIS, Nutt. (Brachyris Ampldachyris, DC.) 

 ('Aft, about, or on both sides, and a^ypov, chaff.) As here constituted, the 

 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 (AMPIIIPAPPUS, Torr. & 

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



A. dracunculoid.es, NUTT. Annual, rather low, effusely corymbiform, the slender 

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

 the uppermost filiform: involucre hemispherical 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 oltlong, nearly as long as the involucre ; disk-flowers 10 to 20, wholly sterile, the ovarv 

 quite abortive ; their pappus of 5 to 8 scarious almost aristiform smooth paleas, cupulately 

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

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

 dracitnctdoides, DC. PI. Rar. Genev. vii. 1, t. 1, & Prodr. v. 313. Brachijris ramosissima, 

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

 351. Plains, Kansas to Texas. 



A. Fremontii, 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 campanulate 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, witli infertile glabrous ovary, and a 

 pappus of about 20 flattish denticulate-hispid tortuous bristles, some of them branching 

 or irregularly paleaceous-concreted at base : ray-akenes with a pappus of fewer and short 

 bristles or squamelke, more united at base. Proc. Am. Acad. viii. 633, & Bot. Calif, i. 

 302. Amphipappus 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. GBIND^LIA, Willd. (Prof. Hicronymus Grindel, of Riga and 

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

 of the 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 rarely infertile. Herbage often balsamic-viscid, the heads especiallv 

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



