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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Habit: Annual 0.5--10(20 cm), +- green to gray, woolly to cobwebby. Stem: 0, or 1, erect, or 2--10, +- decumbent to ascending, generally unbranched or branched proximally, equally or more leafy distally. Leaf: alternate, sessile or petioled, oblanceolate to spoon-shaped, entire, base +- yellow, +- hard; distal leaves subtending heads, +- crowded, largest >= proximal leaves. Inflorescence: heads disciform, sessile, single or 2--40+ per group; involucre 0, simulated by paleae or leaves; receptacle length 0.8--1.3 or 4--6 × width, +- conic, acuminate, bristly; paleae of pistillate flowers open, lanceolate to obovate, acute, flat to concave or +- folded, persistent, +- glabrous, obscurely parallel-veined, veins 5+, margin +- continuous, thinned but scarcely winged; paleae of disk flowers generally 5, +- enlarged, erect proximally, erect to spreading distally, open, obovate, obtuse, cartilaginous, proximally +- yellow, distally green and tomentose adaxially. Pistillate Flower: (3)5--25, all subtended by paleae; corolla obscure, narrowly cylindric. Disk Flower: staminate, 2--6(12); pappus 0; corolla (3)4(5)-lobed, +- bilateral; anther base tailed, tip +- triangular; style tips +- linear-oblong; pappus 0. Fruit: falling free of paleae, +- obovoid, compressed front-to-back, smooth, dull to +- shiny, corolla scar terminal; pappus 0.
Species In Genus: 3 species: western California, southern Oregon. Etymology: (Greek: western Evax) Note: Apparent sister of Ancistrocarphus; bristly receptacle unique. Historical California specimens of Diaperia [Evax sect. Diaperia], native central Arizona and eastward, are likely label errors.
eFlora Treatment Author: James D. Morefield
Jepson Online Interchange
Key to HesperevaxPrevious taxon: Hemizonia congesta subsp. tracyi
Next taxon: Hesperevax acaulis
Citation for this treatment: James D. Morefield 2017. Hesperevax, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=10399, accessed on January 22, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on January 22, 2017.