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Compilation
Hesperevax acaulis

14 Images see all

Hesperevax sparsiflora (A. Gray) Greene var. sparsiflora [family COMPOSITAE]
Original material of Hesperevax acaulis (Kellogg) Greene var. robustior Morefield [family ASTERACEAE]
Holotype of Hesperevax acaulis (Kellogg) E. Greene var. ambusticola J. D. Morefield [family ASTERACEAE]
Isotype of Ancistrocarphus keilii Morefield [family ASTERACEAE]
Isotype of Ancistrocarphus keilii Morefield [family ASTERACEAE]
Holotype of Hesperevax acaulis (Kellogg) Greene var. robustior Morefield [family ASTERACEAE]
Isosyntype of Evax caulescens (Bentham) A. Gray var. brevifolia A. Gray [family COMPOSITAE]
Isotype of Hesperevax acaulis (Kellogg) E. Greene var. ambusticola J.D.Morefield [family COMPOSITAE]
Isotype of Hesperevax acaulis var. ambusticola Morefield [family ASTERACEAE]
Hesperevax acaulis (Kellogg) Greene [family ASTERACEAE]
Filed as Hesperevax acaulis [family ASTERACEAE]
Original material of Hesperevax acaulis (Kellogg) Greene var. robustior Morefield [family ASTERACEAE]
Isotype of Hesperevax acaulis (Kellogg) Greene var. robustior Morefield [family ASTERACEAE]
Hesperevax sparsiflora (A. Gray) Greene var. sparsiflora [family COMPOSITAE]
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Name

Identification
Isotype of Ancistrocarphus keilii Morefield [family ASTERACEAE ] (stored under name); Verified by J.D. Morefield,, Hesperevax acaulis (Kellogg) Greene [family ASTERACEAE ] Verified by Not on sheet,
Related name
  • Hesperevax acaulis
  • Ancistrocarphus keilii
Common name
  • Robust evax, Flora of North America Vol. 19
  • Fire evax, Flora of North America Vol. 19
  • Stemless evax, Flora of North America Vol. 19
  • Dwarf evax, Flora of North America Vol. 19

Flora

Entry for Hesperevax acaulis (Kellogg) 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 acaulis (Kellogg) Greene [family COMPOSITAE], Fl. Francisc., 402. 1897
Stylocline acaulis Kellogg [family COMPOSITAE], Proc. Calif. Acad. Sci., 7: 112. 1877 (as acaule)
Evax acaulis (Kellogg) Greene [family COMPOSITAE]
Treatment Author(s)
James D. Morefield
Information
Plants 0.5–7 cm. Stems 0 or 1–10, erect to prostrate; branches usually 0, sometimes proximal and/or distal. Leaves basal or cauline, sessile or petiolate, distal congested, larger than proximal (if present), largest 4–22(–32) × 0.5–4(–5) mm; petioles: lengths 0–1.5 times blade lengths, bases scarcely thickened, pliant to somewhat cartilaginous; capitular leaves 6–12 (rarely more) per glomerule or head, whorled, ± erect or distally spreading, unlike pistillate paleae. Heads terminal, borne singly or, rarely, in dense glomerules (3–7 mm diam.) of 2–8 mixed with leaves and, rarely, some borne singly in axils (then smaller), campanulate, 2–4 × 1.5–3.5 mm, heights 1–1.5 times diams. Receptacles distinct, 0.9–1.9 × 0.8–1.7 mm. Pistillate paleae in 2–5 series, spirally ranked, broadly spatulate, 1–3 mm. Staminate paleae surpassing pistillate, 1.6–3.2 mm, lengths 0.6–0.8 times head heights; apices spreading. Functionally staminate florets 2–5(–12); corollas 0.6–1 mm. Cypselae 0.6–1.6 mm.
Distribution
sw United States.
Discussion
The varieties of Hesperevax acaulis show enough geographic and ecologic segregation correlated with morphologic differences to warrant taxonomic recognition. Across west-central California, where all three are broadly sympatric, the varieties tend to occur in different habitats and/or elevation zones. Intermediate specimens are difficult to assign with confidence.

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