Pectis. COMPOSITE. 361 



Ann. Lye. N. Y. ii. 214; Gray, PI. Fencll. 61, PL Wright, i. 82, & Bot. Mex. Bound. I.e. 

 P. fastigiata, Gray, PI. Fendl. 1. c. Pectidopsis angustifolia, DC. I.e.; Torr. & Gray, Fl. ii. 

 62. Dry hills and plains, Texas to Colorado and Arizona ; first coll. by James. (Adj. Mex.) 



^ ^ Heads scattered or solitary, on filiform (one or two inches long) peduncles terminating 

 stem and diffuse branches : involucral bracts obtuse, at length more or less infolding ray-akenes : 

 plants a span or two high: leaves shorter than or equalling the internodes, an inch or two long. 



P. filipes, GRAY. Lemon-scented, at length much branched: leaves narrowly linear : invo- 

 lucre narrow, of 5 narrowly oblong bracts : ligules 2 lines long : pappus both in disk and ray- 

 flowers of 2 or 3 (rarely one) rigid subulate awns, shorter than or equalling disk-corolla, with 

 thickened bases and usually very short and blunt interposed squamelhv, sometimes all coro- 

 uiform-concreted, or some disk-flowers destitute of pappus. PI. Fencll. 62, & PI. Wright, ii. 

 G9. P- Jaliscana, Hemsl. Bot. Biol. Ceutr.-Am. in part, not of Hook. & Arn. (as Taliscana) 

 as was supposed. Common from S. W. Arizona (probably not California) to S. W. Texas; 

 first coll. by Coulter. 



P. Rusbyi, GREENE, in herb. "Mint-scented": leaves linear, thickish : involucre campan- 

 ulate, of 7 to 9 oblong very obtuse bracts : ligules 3 lines long : pappus in ray-flowers of 

 two or more slender awns ; in disk-flowers a conspicuous crown of numerous setaceous- 

 pointed squamellffi more or less concreted at base : flowers more numerous than in the pre- 

 ceding. Beaver Creek, N. Arizona, liiisby. 



.2. PECTOTHRIX. Pappus of numerous capillary bristles (at least in most of 

 the disk-flowers) and no palese. Gray, 1. c. 



* Pappus barbellate-setose, uniserial, but occasionally reduced to a crown of squamellse: annual. 



P. papposa, GRAY. A span to a foot high, diffusely or divaricately much branched from 

 the base : leaves very narrowly linear, elongated ( the larger 2 inches long, barely a line 

 wide), very few bristles at their base: peduncles once to thrice the length of the heads: 

 involucre of 7 to 9 linear bracts : akenes sparsely hispidulous with short capitate bristles : 

 pappus shorter than the disk-corolla, normally of 12 to 18 unequal capillary bristles, which 

 are strongly but rather sparsely barbellate, sometimes (especially in the ray) reduced to a 

 setulose or squamellate crown, or quite obsolete. PI. Fendl. 62; PI. Wright ii. 69. P. 

 tenella, Rothrock in Wheeler Eep. vi. 171, not DC. S. California, Arizona, Utah, and New 

 Mexico ; first coll. by Coulter. 



* * Pappus of merely scabrous capillary bristles, with shorter outer ones more or less in a sepa- 

 rate series: ours perennial. 



P. longipes, GRAY. Low and much branched from a perennial root, forming spreading or 

 depressed tufts : leaves crowded, linear, conspicuously setiferous at base : peduncles elon- 

 gated, often scape-like, 3 or 4 inches long: involucre campauulate, 3 lines high, many- 

 flowered, of 12 or 13 linear bracts: rays as many, 3 or 4 lines long: pappus of the ray- 

 flowers setosely 2-aristate ; of the disk multisetose, i. e. of 20 or 30 upwardly denticulate 

 capillary bristles, the longer equalling disk-corolla, and of some small more attenuate outer 

 Olies ._pl. Wright, ii. 70; Rothrock, 1. c., but root not annual. S. Arizona; first coll. by 

 Wriijht, Thiirber, &c. 



3. PECTIDIUM. Pappus when developed of few (1 to 4 or 5) subulate and 

 rigid mostly corneous and persistent, awns, or reduced to a crown or vestige in 

 some flowers. Pectidium & Heteropectis, Gray, PI. Wright, i. 83. 



* Diffuse low annuals, puberulent, with setiferous leaves: corneous divergent awns of the pappus 

 retrorsely barbed, in the way of Bldens. Heteropectis, Gray, 1. c. 



P. Coulteri, GRAY. A span or less high, very diffuse, slender: leaves narrowly linear, 

 setiferous merely at base, only half-inch long : peduncles twice or thrice the length of the 

 head: involucre cylindraceous, 2 lines high, 10-20-flowered, of 5 linear-oblong bracts : serru- 

 late-hispid awns of the pappus 3 or 4 in the ray, 2 or 3 in the disk. PI. Feudl. 62. Ari- 

 zona (probably not California), Coulter, Palmer. 

 P. MITLTISETA, Benth. Bot. vSulph. 20 (Lower California, Hinds, Xantus), is larger, with 



broader and serrulate leaves, all the teeth and the apex bristle-tipped ; outer akeues with 2 or 3 



retrorsely hispid awns ; inner with a single awn and a short crown. 



