Hymenoxys odorata

de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 661. 1836.

Common names: Western bitterweed bitter rubberweed
Illustrated
Treatment appears in FNA Volume 21. Treatment on page 437. Mentioned on page 435, 436.

Annuals, 10–80 cm (robust). Stems 1–25, usually purple-red-tinted proximally, sometimes throughout, often branched throughout, ± hairy. Leaves: blades simple or lobed (lobes 3–19+), ± hairy, gland-dotted; mid leaves lobed (lobes 5–11+, terminal lobes 0.3–1 mm wide). Heads 15–350+ per plant in paniculiform arrays. Peduncles 2–12 cm, sparsely hairy. Involucres subhemispheric to campanulate to ± urceolate, 6–10 × 7–12.5 mm. Phyllaries in 2 series, unequal; outer 8–13, basally connate 1/4–1/3 their lengths, obovate to oblanceolate, 3.5–5.2 mm, apices acuminate; inner 8–13, obovate, 3.8–5.9 mm, apices acuminate to acute. Ray florets 8–13; corollas yellow, 8.5–11 × 3–5.5 mm. Disc florets 50–150+; corollas 2.6–4.1 mm. Cypselae narrowly obpyramidal, 1.7–2.5 mm; pappi of 5–6 obovate, aristate scales 1.6–2.3 mm. 2n = 22, 24, 28, 30.


Phenology: Flowering (Feb–)Apr–Jun(–Aug).
Habitat: Roadsides, open flats, mesquite and creosote-bush flats, ditches and drainage areas, stream banks and bottoms
Elevation: 60–1500 m

Distribution

V21-1093-distribution-map.gif

Ariz., Calif., Colo., Kans., N.Mex., Okla., Tex., Mexico (Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Sonora, Tamaulipas).

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Hymenoxys odorata"
Mark W. Bierner +
de Candolle +
Western bitterweed +  and bitter rubberweed +
Ariz. +, Calif. +, Colo. +, Kans. +, N.Mex. +, Okla. +, Tex. +, Mexico (Chihuahua +, Coahuila +, Durango +, Nuevo León +, San Luis Potosí +, Sonora +  and Tamaulipas). +
60–1500 m +
Roadsides, open flats, mesquite and creosote-bush flats, ditches and drainage areas, stream banks and bottoms +
Flowering (Feb–)Apr–Jun(–Aug). +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Illustrated +
Dugaldia +  and Plummera +
Hymenoxys odorata +
Hymenoxys +
species +