Gymnolomia. COMPOSITE. 269 



long : akenes acutely angled and with few or obscure intermediate nerves, very smooth, the 

 3 or 4 angles extended into a pappus of as many short and blunt teeth, which are barely 

 coroniform-confluent at base. — Lond. Jour. Bot. vi. 245 ; Gray in Pacif. R. Rep. iv. 102, & 

 Proc. Am. Acad. viii. 655. — S. Colorado and New Mexico to Utah and Wyoming, Geyer, 

 Bigelow, Pairy, Ward, &c. 



101. G-YMNOLOMIA, HBK. (IVtos, naked, A£/m, border, the pappus 

 obsolete or none.) — Herbs or frutescent plants (of Mexico and adjacent coun- 

 tries), resembling the smaller-flowered species of Helianthus ; with erect brandl- 

 ing stems, alternate or opposite leaves, and heads of yellow flowers (or the disk 

 brownish) ; the peduncles terminating the branches : fl. summer. — Nov. Gen. & 

 Spec, iv. 217, t. 373,374; Benth. & Hook. Gen. ii. 363. Gymnopsis, DC. 

 Prodr. v. 561, in part. 



* Annuals : receptacle of the head conical and the disk high : bracts of the rather simple involucre 

 linear. — Heliomeris, Nutt. 



G. Porteri, Gray. A foot or two high, slender, paniculately branched, sparingly hispid, 

 otherwise nearly glabrous : leaves nearly all alternate, narrowly lanceolate or linear, entire : 

 rays 5 to 8, oval or obovate (half-inch or more long), deep orange yellow : disk in age oblong- 

 conical ; its chaffy bracts oblong-lanceolate or the outer ovate, cuspidate-acuminate, striate, 

 merely concave at maturity : fructiferous receptacle almost columnar : akenes turgid-obovate, 

 very obscurely quadrangular, dull, somewhat puberulent, with small terminal areola, one of 

 the angles or nerves sometimes slightly margined or umbonate at the summit : style-tips 

 subulate and hispid. — Proc. Am. Acad. xii. 59 ; Meehan, Nat. Flowers, ser. 2, ii. t. 35. — Rud- 

 beckia ? Porteri, Gray, PI. Fendl. 83. — Northern Georgia, known only on the isolated granite 

 rock called Stone Mountain, near Atlanta, where it abounds ; first coll. by Prof. Porter. 



G. multiflora, Benth. & Hook. A foot to a yard high, strigulose-pubescent or scabrous, 

 sometimes also hispid, often much branched : leaves from narrowly linear to lanceolate, 

 rarely broader,' either alternate or mainly opposite, entire or obscurely denticulate : rays 

 10 to 15, golden yellow : disk hemispherical, in age little more elevated and receptacle ob- 

 tusely conical ; its bracts obtuse or the inner acute with soft acumination : akenes smooth, 

 compressed, with convex or obtusely angulate sides : style-tips short and obtuse. — Benth. & 

 Hook, ex Rothrock in Wheeler Rep. vi. 160, & Hemsl. Biol. Centr.-Am. ii. 162. Heliomeris 

 mult!flora, Nutt. 1. c. ; Gray, PI. Fendl., PI. Wright, ii. 87, with var. hispida, &c. — Sandy 

 banks of streams, &c, W. Texas to Wyoming, Nevada, and Arizona. Very polymorphous : 

 the root not perennial as was supposed. An indigenous specimen coll. by Lemmon in Arizona 

 has disk-corollas all converted into rays or radiatiform ampliate lobes. (Mex.) 



G. triloba, Gray. Much branched, over 2 feet high (root not seen), obscurely puberulent, 

 no hispid bristles : leaves roundish in general outline, 3-lobed, with subcordate or truncate 

 base, short-petioled, the lobes short and broad : rays 12 or more, oblong-linear, elongated : 

 disk hemispherical : receptacle low-conical : akenes of the preceding but more oblong. — 

 Proc. Am. Acad. xvii. 217. — Mountains of S. Arizona south of Rucker's Valley, Lemmon. 

 # * Perennial or frutescent : disk and receptacle low. 



G. tenuifolia, Benth. & Hook. Shrubby, much branched, 2 or 3 feet high, scabrous- 

 puberulent, very leafy : branches terminated by solitary long-peduncled heads : leaves alter- 

 nate and the lower opposite, canescent beneath, pinnately or pedately parted into 3 to 7 

 narrow linear lobes, or the uppermost very narrow and entire, the margins mostly revolute : 

 bracts of the involucre subulate-linear: rays 10 to 16: disk convex: chaffy bracts of the 

 receptacle truncate-obtuse: akenes smooth, quadrangular-compressed.— Ex Hemsl. Biol. 

 Centr.-Am. 1. c. Heliomeris tenuifolia, Gray, PI. Fendl. 84, PI. Wright, &c — S. W. Texas, 

 Wright, Havard. (Adj. Mex., Berlandier, Gregg, &c.) 



# # # Annual: receptacle and disk barely convex: habit of Encelia and Jlelianfhus. 



G. encelioides, Gray. A foot or two high from an annual root, strigose-canescent and 

 the branching stem hispid : leaves ovate-oblong or obscurely deltoid, rather obtuse, nearly- 

 entire, mostly long-petioled, the lower opposite : heads barely half-inch high : involucre bi- 

 serial ; outer bracts all equal and equalling the disk, oblong-lanceolate, acute, white with soft 



