Psilactis brevilingulata
Diagn. Pl. Nov. Mexic. 2: 34. 1879.
Annuals, 15–75 cm. Stems and branches stipitate-glandular, more densely distally, often also with appressed or erect hairs. Distal leaf-blades sessile, lanceolate to linear-lanceolate, smallest 2–10 × 0.5–1.5 mm. Involucres broadly turbinate to hemispheric, 2–4 mm. Phyllaries lanceolate to linear, slightly unequal, 1.5–3.5 × 0.2–0.6 mm, bases indurate, margins scarious. Receptacles flat to convex, 1.5–2.5 mm diam. Ray-florets 15–40; laminae 1–4 × 0.2–0.5 mm. Disc-florets 15–35; corollas 1.5–2.5 mm. Ray cypselae 1–1.5 mm, moderately appressed-hairy. Disc cypselae 1.3–2 mm, moderately appressed-hairy; pappi 20–25, 2–2.5 mm. 2n = 18 (Mexico).
Phenology: Flowering May–Oct.
Habitat: Fields, roadsides, stream banks, open areas in oak and pine-oak woodlands
Elevation: 1300–2100 m
Distribution
Ariz., N.Mex., Tex., Mexico, South America (Colombia), South America (Peru)
Discussion
In the flora area, Psilactis brevilingulata occurs in the Chihuahuan Desert regions of southeastern Arizona, southwestern New Mexico, and western Texas.
Selected References
None.
Lower Taxa
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