Trans Pecos Poreleaf

Subshrubs or shrubs, 20–60+ cm; internodes mostly 10–30 mm. Leaf blades mostly filiform, 10–40 × 1–2 mm. Phyllaries 7–10, oblanceolate to linear, 6–10 mm. Florets mostly 40–80+; corollas yellow, 5–8 mm. Cypselae 3.5–5.5 mm; pappi: longer bristles 6–7.5 mm. 2n = 24.

Porophyllum fruticulosum Rydberg, sp. nov
A low shrub, less than 3 dm. high, with spreading flexuose terete branches; leaves filiform, fleshy, 1-1.5 cm. long; heads at the ends of the branches; peduncles 1-3 cm. long; involucre campanulate, S-9 mm high and as broad; bracts 7-9, oblong-linear, acute, rounded on the back, with few linear glands in 1 or 2 dorsal rows; corollas 6-7 mm. long, yellow, glabrous; tube much shorter than the cylindric throat; lobes short, ovate; achenes 5 mm. long, cylindric, hirsute; pappus yellow, 5-6 mm. long; bristles hispidulous.
Type collected near Saltillo, Coahuila, November, 1902, Palmer 2S5 (herb. N. Y. Bot. Gard.).

Porophyllum scoparium A. Gray, PI. 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 terminating 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 occasionally 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.