Porophyllum pringlei Robinson

Porophyllum pringlei B. L. Robinson, Proc. Am. Acad. 27: 178 1892.
A slender glaucous annual; stem 3-6 dm. high, terete, branched above; leaves of the stem opposite; petioles 1-2 cm. long, slender; blades oval or elliptic, subentire, rounded at the apex, acute at the base, very thin, 2-4 cm. long, 1-2 cm. wide; leaves of the branches smaller and alternate; glands marginal, few, elliptic; heads few, erect; peduncles erect, 1-3 cm. long; involucre cylindric, about 18 mm. high; bracts 5, narrowly linear, acuminate, scarious-margined, with a single median row of glands; flowers about 12; corollas nearly white, 7 mm. long; tube very slender, many times longer than the funnelform throat; lobes lanceolate; achenes 7 mm. long, narrowly cylindric, hispidtilous ; pappus straw-colored. 6-7 mra. long; bristles scabrous.
Type uoc.lity: Barranca near Guadalajara [Jalisco].
DiSTRIBOTio.v: Jalisco.

Porophyllum quinqueflorum Brand. Zoe 5 : 225. 1905
A divaricately branched annual; stem 5-6 dm. high, branched above the middle, terete, somewhat striate; leaves alternate; petioles filiform, 2-3 cm. long; blades obovate or oblanceolate, rounded at the apex, tapering at the base, 2-5 cm. long, 1-2 cm. wide, very thin; glands 0-7, marginal; peduncles from the axils of the leaves, divaricate, 1-2.5 cm. long; involucre davate-cylindric, about 1.-5 cm. high; bracts 5, narrowly linear, acute, green, with a single row of linear glands; flowers about 5; corollas 9 mm. long, ochroleucous; tube filiform, many times longer than the funnelform throat; lobes lanceolate; achenes about 8 mm. long, hispidulous; pappus straw-colored, 7 mm. long; bristles scabrous.
Type locality: Cerro Colorado. Sinaloa.
DtSTEiBUTiON : Known only from the type locality.