192 NORTH AMERICAN FLORA [VoLUME 34 
olate, obtuse at the apex, slightly round-keeled on the back, and gibbous at the base, with two 
rows of elliptic glands; corolla nearly white with purplish streaks, 7-8 mm. long; tube longer 
than the elongate-funnelform or nearly trumpet-shaped throat; lobes narrowly lanceolate; 
achenes 9 mm. long, brown, hispidulous, tapering at the summit; pappus straw-colored, 
7 mm. long; bristles hispidulous. 
Type Locatity: Mescal Mountain, Arizona. _ : 
DISTRIBUTION: Western Texas to southern California. 
35. Porophyllum pinifolium Rydberg, sp. nov. 
A low shrub, copiously branched at the base; branches slender, green, turning purple in 
age; leaves alternate, linear-filiform, 2-4 cm. long, light-green; heads solitary at the ends of 
the branches; peduncles 1-2 em. long; involucre cylindro-campanulate, about 1 cm. high; 
bracts 5, linear, acutish, light-green, rounded on the back and slightly gibbous at the base, 
with two rows of ellipsoid glands; corollas cream-colored, streaked with purple, 8 mm. long. 
glabrous; tube longer than the trumpet-shaped throat; lobes lanceolate; achenes 6 mm. long, 
hispidulous; pappus as in the preceding, but shorter. 
Type collected in the vicinity of Alamos, Sonora, Rose, Standley & Russell 12757 (U.S. Nat. 
Herb. and herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Sonora and the Cape region of Lower California. 
36. Porophyllum maritimum Brand. Zoe 5: 162. 1903. 
A perennial, fruticose at the base; stem about 2 dm. high, divaricately branched, striate, 
glaucous; leaves sessile, terete, fleshy, 2-3 em. long, acuminate, with 2-4 glands; heads termi- 
nating the short branches, or solitary in the upper axils; peduncles 2-4 cm. long; involucre 
oblong, very glaucous, 10-12 mm. high; bracts 5, oblong, obtuse, with a double line of oblong or 
linear glands, purple-tinged, at last reflexed; floweres 15-20; corollas 7 mm. long, ochroleucous 
with dark streaks on the throat; tube shorter than throat; achenes 8 mm. long, tapering at 
the apex, hispidulous with yellow hairs; pappus 7 mm. long, yellow, tinged with rose; bristles 
hispidulous. 
TYPE LocaLity: Between Cabo San Lucas and San José del Cabo, Lower California. 
DistTRIBUTION: Southern Lower California. 
37. Porophyllum amplexicaule Engelm.; A. Gray, Pl. Wright. 
1120)" 1852" 
A perennial, fruticose at the base; stem 5 dm. high or more, glabrous, terete, erect, more 
or less glaucous; leaves ovate-lanceolate, semi-amplexicaul, acute, fleshy, 2-3 cm. long; 
heads solitary at the end of the branches; peduncles 4-6 cm. long, abruptly thickened under 
the head; involucre turbinate, about 8 mm. high and 15-20 mm. broad; bracts 8-10, broadly 
linear, acuminate, but with a blunt apex; glands linear and oblong, irregularly disposed in 
4 lines, 2 near the midrib and 2 along the margins; corollas about 7 mm. long; tube 3 mm. 
long; throat narrow, tubular-trumpet-shaped; lobes lanceolate; achenes 7 mm. long, hispidu- 
lous; pappus 7 mm. long, brown; bristles scabrous-hispidulous. 
Type Locatity: Near Mesillas, Coahuila. 
DIsTRIBUTION: Coahuila. 
38. Porophyllum scoparium A. Gray, Pl. Wright. 1: 119. 1852. 
A suffruticose perennial; stems much branched, 3-6 dm. high; branches green, terete, 
scarcely striate, mostly erect; leaves filiform, thick, 2.5—4 cm. long, 1 mm. wide; heads termi- 
nating the branches; peduncles 2-5 cm. long; involucre campanulate, 8-10 mm. high and 
nearly as broad; bracts 6-9, linear or oblanceolate, acute, rounded on the back; glands 
linear, few, irregularly disposed, but mostly forming 1 or 2 dorsal lines, in some bracts occa- 
sionally wanting; corollas yellow, 6 mm. long; tube much shorter than the cylindric throat; 
lobes ovate; achenes 4 mm. long, cylindric, hispid; pappus yellow, 6 mm. long; bristles 
hispidulous. 
TYPE LocaLity: Banks of San Pedro River, Texas. 
DIsTRIBUTION: Texas, New Mexico, Chihuahua, and Coahuila. 
