12 PROCEEDINGS OF THE AMERICAN ACADEMY. 
form, 2 to 6 cm. long, with conspicuous subulate tips and 2 rows of dark 
glands, entire or rarely with 1 or 2 small lobes, but no setx at the bases: 
peduncles elongate, 14 to 2 dm. long, with many bracts, the lower bracts 
leaf-like, the upper reduced : heads large, 1 cm. or so high, almost as broad, 
60-80-flowered ; involucre of 8 to 15 oblong bracts thickened and herba- 
ceous below, with conspicuous dark glands, scarious above, with round or 
subtruncate erose tips: rays oblong, 1 cm. long, white, becoming dark- 
striped with age: pappus sordid, of 10 to 20 subequal linear-subulate 
setiferous pales, a few of them setiform and hardly paleaceous below, 44 
or 5 mm. long, equalling the glabrate akenes. — Proc. Am. Acad. xxv. 
155. — Coanulta, calcareous hills, Carneros Pass (Pringle, no. 2403). 
Originally placed by Dr. Watson in § Pectothrix, but the definitely pale- 
aceous pappus, strongly resembling that of P. Sinaloensis, places it rather 
in this section. 
§ 2. Pecripopsis, Gray. Annuals, or rarely perennials(?) with nar- 
row leaves setiferous at the bases: involucre short-cylindrical, the bracts 
linear, often becoming strongly involute: pappus of a few (1 to 6) slender 
upwardly scabrous setiform rather rigid awns sometimes dilated at the 
bases, with or without a short crown of separate or united squamelle, of 
sometimes reduced merely to the crown. — Pl. Wright. i. 82. -Helioreos, 
Raf. Atl. Jour. (1832) 145. Pectidopsis, DC. Prodr. v. 98. Pectis § Hu- 
pectis, Gray, Proc. Am. Acad. xix. 44, in part. 
* Low branching herbs with elongate-linear leaves: heads subsessile or short- 
peduncled, fastigiate : involucre about 8-bracteate. (Forms of P. papposa may 
be looked for here.) 
J, P. tenella, DC. Low, 2 dm. or less high, spreading and branching 
from near the base: stems angulate, smooth or minutely puberu ous: : 
leaves mucronate, 1} to 4 em. long, 1 or 2 mm. wide, broadened at the : 
bases, with prominent midribs and 2 rows of large glands on the lower | 
sides ; margins revolute, with 1 to 4 pairs of sete at the bases : involucre 
4 or 5 mm. high, 15—25-flowered ; the bracts prominently keeled, with 
scarious margins, bearing toward the tips a large gland, and sometimes 1 
or 2 below : rays oblong, 3} to 5 mm. long, yellow: pappus merely of 2 
to 6 slender variously unequal awns, the longest 2 to 4 mm. long: akenes ; 
slightly longer than the pappus, smooth or minutely short-setulose.~ — 
Prodr. v. 99; Gray in Torr. Bot. Mex. Bound. 73 & Proc. Amer. A 
xix. 46. Plains, Southern Texas to Chihuahua and Tamaulipas. q 
Texas, Laredo, and between the Rio Grande and the Nueces (Berlandiety 
nos. 599, 985, 2009, 2415), Rio Coleto (Thurber, no. 19); Cammuan0’ — 
Chihuahua (Pringle, no. 648) ; Tamauipas, near Mier (Gregg, n0- 62). a 
