76 PROCEEDINGS OP THE AMERICAN ACADEMY. 



scabrous, the internodes elongated: leaves plane or revolute, smooth or 

 scabrous toward the bases, obtuse or acute and sometimes mucrouulate, 

 shorter than or equalling the internodes, in large specimens 5 or 6 cm. 

 long, 3 mm. wide, naked or bearing 1 to 5 pairs of basal seta3 : peduncles 

 terete, 2 to 8 cm. long, ebracteate or with 1 to 3 remote bracts : involucre 

 4 to 6 mm. high, about 10-flowered, the bracts blunt or quite obtuse, 

 plane or slightly keeled below the middle, generally glandless or with 

 faint glands : rays 5 or 6 mm. long: pappus 1 to 4 slender rigid awns 2^ 

 to 4 mm. long, and sometimes a few blunt squamella3 at the base : akenes 

 4 or 5 mm. long. — Harv. & Gray in Gray, PI. Fendl. 62 ; Gray, PI. 

 Wright, ii. 69, in Torr. Mex. Bound. 73 & Bot. Cal. i. 400. P. Jalis- 

 cana, Hemsley, Biol. Centr.-Am. Bot. ii. 225, in part, not Hook. & Arn. 

 P. punctata, Wats. Proc. Am. Acad. xxiv. 58, not Jacq. — A lemon- 

 scented species common in the mountains from Southwestern Texas 

 through New Mexico, Arizona, and adjacent Mexico. Texas, Pena 

 Colorado (Havard, no. 11); New Mexico, Coppermine Creek (C. 

 Wright, no. 1125), Coke Canon (Thurber, no. 1167) ; Arizona, Sul- 

 phur Springs (Rothrock, no. 539), near Fort Huachuca (Lemmon, no. 

 2781), Santa Rita Mts. (Priugle); Sonora, Guaymas (Palmer, 1887, 

 no. 656). Founded upon Coulter's no. 329 from "California." 



Var. subnuda, Suberect, branching mostly above tlie base: pedun- 

 cles \'^ to 3 cm. long, ebracteate or with one or two apical bracts: invo- 

 lucre pale, purple-tinged, 5 mm. high, the bracts acutish or rarely obtuse: 

 rays 3 or 4 mm. long : the 1 or 2 awns 2 mm. long, usually with dilated 

 bases: akenes 3^ or 4 mm. long. — Soutlieastern Arizona and adjacent 

 Mexico. Arizona, Bisbee (F. E. Lloyd) ; Sonora, Cocuto (Hartman, 

 no. 70) ; Chihuahua, Janos (Schott). 



-f— -t— Involucre about 8-bracteate. 

 ++ Bracts broad-linear, flat at least above the middle, very obtuse. 

 = Pappus of both ray- and disk-akenes aristiform 



P. Pringlei. Low, 5 or 6 cm. high, divergently much-branched, 

 with strongly angulate glabrous branches and peduncles : leaves revolute, 

 slender, mucronate, equalling or longer than the internodes, 1 to 2 cm. 

 long, barely 1 mm. wide, with 2 pairs of basal set£e : peduncles Ii to 

 2^ cm. long, usually 1-2-bracteate : involucre 5 or 6 mm. high, about 25- 

 flowered ; the bracts plane above, strongly keeled below, bearing a large 

 apical gland, and 1 or 2 smaller ones below : rays 5 mm. long : pappus 

 2 or 3 very slender awns 3 to 5 mm. long, slightly dilated below : akenes 

 equalling or slightly exceeding the awns. — Durango, Jimulco (Pringle, 

 no. 125). 



