Hymenoxys odorata |
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bitter hymenoxys, bitter rubberweed, fragrant bitter weed, poison rubberweed, western bitterweed |
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Habit | 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). |
Peduncles | 2–12 cm, sparsely hairy. |
Involucres | subhemispheric to campanulate to ± urceolate, 6–10 × 7–12.5 mm. |
Ray florets | 8–13; corollas yellow, 8.5–11 × 3–5.5 mm. |
Disc florets | 50–150+; corollas 2.6–4.1 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. |
Heads | 15–350+ per plant in paniculiform arrays. |
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. |
Hymenoxys odorata |
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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 (200–4900 ft) |
Distribution |
AZ; CA; CO; KS; NM; OK; TX; Mexico (Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Sonora, Tamaulipas)
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Source | FNA vol. 21, p. 437. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Hymenoxys |
Sibling taxa | |
Name authority | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 661. (1836) |
Web links |