Psilactis heterocarpa
Syst. Bot. 18: 301. 1993.
Basionym: Machaeranthera heterocarpa R. L. Hartman & M. A. Lane
Revision as of 15:17, 18 September 2019 by FNA>Volume Importer
Annuals, 25–100 cm. Stems and branches finely appressed-hairy, stipitate-glandular distally. Distal leaf blades sessile, lanceolate to linear-lanceolate, smallest 2–15 × 0.3–1.5 mm. Involucres broadly turbinate, 4–6 mm. Phyllaries lanceolate to linear, unequal, 2–4.5 × 0.5–0.7 mm, bases indurate, margins scarious. Receptacles flat to convex, 2–2.5 mm wide. Ray florets 15–25; laminae 4–5 × 0.7–1.3 mm. Disc florets 25–35; corollas 3–4 mm. Ray cypselae 1.3–1.5 mm, sparsely appressed-hairy. Disc cypselae 2–3 mm, glabrate or glabrous; pappi 25–40, 3.2–4 mm. 2n = 6.
Phenology: Flowering Sep–Nov.
Habitat: Grasslands, weedy pastures, open areas in Prosopis-Acacia woodlands
Elevation: 10–20 m
Discussion
Of conservation concern.
Psilactis heterocarpa is known from seven counties in the Gulf Coastal Plain of southern Texas.
Selected References
None.
Lower Taxa
None.