Compilation
Evax caulescens

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Name

Identification
Evax caulescens A.Gray [family ASTERACEAE ] Psilocarphus caulescens Benth. [family ASTERACEAE ] (stored under name);
Related name
  • Evax caulescens
  • Hesperevax caulescens
  • Hesperevax sparsiflora
  • Psilocarphus caulescens
Common name
  • involucrate evax, Flora of North America Vol. 19
  • Erect evax, Flora of North America Vol. 19
  • Hogwallow starfish, Flora of North America Vol. 19
  • Seaside or short-leaved evax, Flora of North America Vol. 19

Flora

Entry for Hesperevax sparsiflora (A. Gray) Greene [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 19,
Names
Hesperevax sparsiflora (A. Gray) Greene [family COMPOSITAE], Fl. Francisc., 402. 1897
Evax caulescens (Bentham) A. Gray var. sparsiflora A. Gray [family COMPOSITAE], in A. Gray et al., Syn. Fl. N. Amer., 1(2): 229. 1884
Evax sparsiflora (A. Gray) Jepson [family COMPOSITAE]
Treatment Author(s)
James D. Morefield
Information
Plants 2–17 cm. Stems 1–10, ascending to erect (rarely 0); branches 0 or proximal. Leaves mostly cauline, petiolate, distal scarcely congested, ± equal to proximal, largest 6–32 × 3–8(–10) mm; petioles: lengths 0.9–1.5 times blade lengths, bases thickened, cartilaginous to ± indurate; capitular leaves 1–4 per glomerule or head, approximate, not whorled, ascending to erect, some sometimes grading into pistillate paleae (by reduction of blades, expansion of petiole bases). Heads terminal in loose glomerules (3–4 mm diam.) of 3–5 mixed with leaves and some borne singly in axils, cylindric, 3–4.5 × 1.5–2 mm, heights 1.8–2.5 times diams. Receptacles distinct, 1.4–1.8 × 0.2–0.4 mm. Pistillate paleae in 1–3 series, spirally ranked, oblanceolate, 2.5–4.5 mm. Staminate paleae not or scarcely surpassing pistillate, 1.1–1.8 mm, lengths 0.3–0.4 times head heights; apices ± erect. Functionally staminate florets 2–5; corollas 0.8–1.1 mm. Cypselae mostly 1–1.7 mm.
Distribution
sw United States.
Discussion
The varieties of Hesperevax sparsiflora occur in distinct habitats and might be treated as separate species but for some morphologically intermediate specimens from areas of sympatry in the San Francisco Bay area.

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