FERNALD. GENUS PECTIS. 79 



very unequal setiform bristles, the longer a little or not at all dilated 

 below, and often with an exterior series of minute setae at the base: 

 akenes short-setose or glabrate. — Bot. Beech. 'I'JQ ; Gray, PI. Feudl. 

 62, excl. syn. & Proc. Am. Acad. xix. 47, in part; Hemsley, Biol, 

 Centr.-Am. Bot. ii. 225, in part; Rose, Contrib. U. S. Nat. Herb. i. 338. 

 F. Taliscana, Benth. PI. Hartw. 121, not Hook. & Am. fide Hemsl. 1. c. 

 — Southwestern Mexico. Jalisco (Beechy in Hook. & Arn. I.e.), 

 Rio Blanco (Palmer, 1886, no. 4), dry rocky hills near Guadalajara 

 (Pringle, no. 1814) ; Colima, common on river banks at Colima (Palmer, 

 181)1, no. 1155). Gregg's no. 967 (no locaHty given) is doubtless the 

 same thing. The pappus of this as well as the last species is very 

 variable in the number of bristles, which are sometimes reduced to 3 or 4, 

 thus forming a transition to § Pectidupsis. The Nicaragua and Panama 

 specimens referred here by Hemsley are more likely P. elongata. 



* * More diffusely branched from near the base : leaves less rigid and more 



spreading : heads small or middle-sized. 

 H— Annuals, the pappus mostly barbellate-setose (in P. papjjosa sometimes reduced 



to a mere crown). 



P. papposa, Harv. & Gray. Stems smooth, much-branched, the 

 divergent branches 3 dm. or less in length ; leaves fleshy, narrow-linear, 



1 to 6 cm. long, 1 or 2 mm. wide, rarely with a few sharp lobes, bearing 



2 rows of prominent marginal glands and 2 to 5 pains of basal setae : 

 heads subfastigiate, or subcorymbose on slender 1-3-bracteate peduncles 

 2 or 3 cm. long, the bracts often glandular : involucre 4^ to 7 mm. high, 

 about 20-flowered ; the 7 to 9 linear strongly involute obtusish bracts 

 more or less punctate: rays yellow, 4 to 8 mm. long: disk-pappus 12 to 

 20 unequal generally barbellate-setose bristles, 4 mm. or less in length, 

 or sometimes reduced to a mere auriculate crown ; ray-pappus a squamel- 

 lose or auriculate crown, rarely with 1 or 2 slender awns, or even obso- 

 lete : akenes 3 or 4 mm. long, hispid ulous or strigose with minute uncinate 

 or capitate bristles. — Harv. & Gray in Gray, PI. Fendl. 62 ; Gray, PL 

 Wright, ii. 69, in Torr. Bot. Mex. Bound. 73 & Syn. Fl. i. pt. 2, 361 ; 

 Hemsley, Biol. Centr.-Am. Bot. ii. 226. P. tenella, Rothr. in Wheeler, 

 Rep. vi. 171, not DC. P. Palmeri, Wats. Proc. Am. Acad. xxiv. 58, 

 as to Palmer's no. 655. — Sandy or gravelly soil, Southwestern United 

 States to Sonora and Lower California. Nev^' Mexico, Dona Ana 

 (C. Wright, no. 1126), Camp Bowie (Rothrock, no. 446), Deming 

 (G. M. Kellogg) ; Arizona (S. Hayes, no. 342), Fort Whipple (Coues 

 & Palmer, no. 522"), Yuma (Pringle, no. 322), Maricopa (Pringle, 

 no. 123), Tucson (fToumey, no. 675) ; California (Coulter, no. 331), 



