164 COMPOSITE. Aphanostephus. 



ramosissima, Gray, PI. Fendl. 71, & PI. Liudh. ii. 220. Rocky and sandy prairies, Texas. 



(Adjacent Mex.) 

 A. humilis, GRAY, 1. c. Low and diffuse, soft-pubescent and cinereous : leaves rarely entire, 



often piunatifid : heads on slender peduncles : rays 3 or 4 lines long : akenes shorter and 



more distinctly costate-augulate. Leucopsidium humile, Eeuth. PI. Hartw. 18. Egletes 



hum!]!.*, Gray, PI. Fendl. 71. Southern and western borders of Texas, Wri'jht, Palmer (but 



his plant, no. 494, doubtful), Rei'crcJiuu. (Mex.) 



A. RAMOSUS, Gray, Proc. Am. Acad. xvi. 90 (Keerlia ramosa, DC.), Mexico, Keerl, is im- 

 perfectly known. 



# * Pappus more conspicuous and dentate or laciniate: base of the corolla-tube in age promi- 

 nently thickened and indurated, long persistent on the strongly angulate-costate akene. 



A. Arkansanus, GRAY, 1. c. Diffuse, a foot high, cinereous-pubescent : leaves from 

 oblong-spatulate to broadly lanceolate ; lower often toothed or sinulate-lobed : heads larger : 

 rays coinmonlv half-inch long: outer akeues usually suherose-angled or ribbed: pappus 

 mostly obtusely 4-5-lobed or plurideutate. Leucopsidium Arkansanum, DC. Prodr. vi. 43. 

 Keerfffi sJci'rrobasis, DC. Prodr. v. 310 ; Deless. Ic. iv. t. 18; Hook. Ic. t. 240. Egletes Arkan- 

 xnnti, Nutt. Trans. Am. Phil. Soc. vii. 394; Torr. & Gray, Fl. ii. 411. Plains of Arkansas, 

 Kansas, and Texas ; first coll. by Dcrlandicr. 



Var. Hallii, GRAY, 1. c. Somewhat smaller: leaves varying from entire to piuuately 

 parted : crown of the pappus more conspicuous, deeply cleft into 4 or 5 unequal subulate- 

 acuminate lobes ! Texas, E. Hall (no. 303, 304), Palmer. 



37. G-REENELiLiA, Gray. (Rev. Edward Lee Greene, the discoverer.) 

 Slender and low winter annuals ; the typical species (analogous to Gutierrezia) 

 diffuse and conspicuously radiate ; an ambiguous species rayless, and perhaps not 

 truly congeneric. Proc. Am. Acad. xvi. 81. 



G. Arizonica, GRAY, 1. c. Smooth and glabrous, diffusely branched from the base : leaves 

 small (inch or less long), entire, veinless, sessile, alternate ; radical ones lanceolate or ob- 

 scurely spatulate, hispidulous-ciliolate ; cauliue narrowly linear and gradually reduced to 

 subulate : heads solitary at summit of divergent filiform brauchlets : involucre 2 or 3 lines 

 high and wide; bracts with a conspicuous subapical green spot: rays 10 to 16, oblong or 

 obovate, white : mature akenes densely white-villous, the hairs tipped with a capitellate 

 gland: border of the pappus-crown multisetulose-dissected. Mesas of Arizona, Greene 

 (1877), Lemmon, Prinyle. The root obviously not perennial. 



G. discoidea, GRAY. Stems or branches numerous from a probably monocarpic but lig- 

 nescent root, strict, very leafy : leaves all narrowly linear, acute; the lower (over an inch 

 long) with obscurely ciliolate-scabrous margins: heads somewhat corvmbose : involucre 

 barely 2 lines high; the bracts more srarious and with indistinct green spot: rays none: 

 ovaries glabrous : pappus plurideuticulate. Proc. Am. Acad. xix. 2. S. Arizona, iu 

 Tanner's Canon, Lemmon. 



38. KEERLIA, Gray. (F. W. Keerl, a German traveller in Mexico.) 

 Diffusely and slenderly branched Texan herbs, leafy-stemmed ; with small panicu- 

 late heads on almost capillary peduncles, white or purple rays, and oblong entire 

 sessile leaves ; the style-appendages in one species much elongated (in the manner 

 of the preceding genus), and this has only sterile ovaries in the disk. -- PI. Lindh. 

 ii. 220, & PI. Wright, i. 92, not DC., whose genus of this name was founded on 

 two species of Aphanostephus and a Xantliocephalum, to which was added a syn- 

 onyme belonging to a J3ellis. 



K. bellidifolia, GRAY & ENGELM. Annual, pubescent, effusely branched from near the 

 base, a span or two high; when young with the habit of Bell is h/trrjrifolia : lower leaves 

 obovate or spatulate ; uppermost somewhat linear: involucre only 2 lines long: rays 4 to 15, 

 blue: style-appendages in the disk-flowers short and very obtuse: akenes obovate-clavate 

 and iiK.dcrairly compressed. Proc. Am. Acad. i. 47; PI. Lindh. 1. c. ; PI. Wright, 1. c. 

 Fertile soil, Texas, Lind/ieimer, Wright. 



