Comprehensive Description
provided by North American Flora
Porophyllum filiforme Rydberg
Porophyllum filifolium A. Gray (; S. Wats. Proc. Am. Acad. 18: 107, hyponym. 1882), Proc. Am. Acad. 19; 35. 1883. Not P. filifolium DC. 1836.
A perennial herb, with a slender woody caudex; stems rigid, branched above; leaves alternate, filiform, 1-5 cm. long; heads solitary at the ends of the branches; peduncles 2-5 cm. long; involucre campanulate, about 8 mm. high; bracts 5-8, obovate, rounded or truncate at the apex, dark-purple, with 2 rows of linear glands, round-keeled and gibbous at the base; corollas purple, 5 mm. long; tube shorter than the elongate-funnelform throat; lobes lanceolate; achenes 5 mm. long, hispidulous; pappus ochroleucous, purple-tinged, 3-4 mm. long; bristles hispidulous.
Ty'pe locality: Sierra Madre, south of Saltillo, Coahuila.
Distribution: Coahuila.
- bibliographic citation
- Per Axel Rydberg. 1916. (CARDUALES); CARDUACEAE; TAGETEAE, ANTHEMIDEAE. North American flora. vol 34(3). New York Botanical Garden, New York, NY
