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bitter hymenoxys, bitter rubberweed, fragrant bitter weed, poison rubberweed, western bitterweed

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

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
from FNA
AZ; CA; CO; KS; NM; OK; TX; Mexico (Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Sonora, Tamaulipas)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 437.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Hymenoxys
Sibling taxa
H. ambigens, H. bigelovii, H. brachyactis, H. brandegeei, H. cooperi, H. grandiflora, H. helenioides, H. hoopesii, H. jamesii, H. lemmonii, H. quinquesquamata, H. richardsonii, H. rusbyi, H. subintegra, H. texana, H. vaseyi
Name authority de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 661. (1836)
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