Hymenoxys odorata

de Candolle in A. P. de Candolle and A. L. P. P. 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, glanddotted; 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), Mexico (Coahuila), Mexico (Durango), Mexico (Nuevo León), Mexico (San Luis Potosí), Mexico (Sonora), Mexico (Tamaulipas)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Hymenoxys odorata"
30 +, 28 +, 24 +  and 22 +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
Mark W. Bierner +
de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +
decurrent +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Western bitterweed +  and bitter rubberweed +
0.85 cm8.5 mm <br />0.0085 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
hairy +  and glabrous +
obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Calif. +, Colo. +, Kans. +, N.Mex. +, Okla. +, Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +, Mexico (Nuevo León) +, Mexico (San Luis Potosí) +, Mexico (Sonora) +  and Mexico (Tamaulipas) +
60–1500 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides, open flats, mesquite and creosote-bush flats, ditches and drainage areas, stream banks and bottoms +
discoid +  and radiate +
in paniculiform to corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
subhemispheric;campanulate +
0.7 cm7 mm <br />0.007 m <br /> (1.25 cm12.5 mm <br />0.0125 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
obovate +  and oblanceolate +
unequal +  and subequal +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
2-carpellate +
persistent +
2 cm20 mm <br />0.02 m <br /> (12 cm120 mm <br />0.12 m <br />) +
Flowering (Feb–)Apr–Jun(–Aug). +
28 +  and 50 +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
conic;ovoid;conic;ovoid;hemispheric +
5 +  and 6 +
aristate +  and obovate +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
exalbuminous +
subequal;unequal +
Illustrated +
purple-red-tinted +
1 +  and 25 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Dugaldia +  and Plummera +
Hymenoxys odorata +
Hymenoxys +
species +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.59 cm5.9 mm <br />0.0059 m <br />) +
shrub +  and subshrub +