Hymenoxys lemmonii

(Greene) Cockerell

Bull. Torrey Bot. Club 31: 477. 1904.

Common names: Lemmon’s rubberweed or bitterweed
Endemic
Basionym: Picradenia lemmonii Greene Pittonia 3: 272. 1898 (as lemmoni)
Treatment appears in FNA Volume 21. Treatment on page 443. Mentioned on page 435, 437.

Perennials, 30–50 cm (polycarpic; often with moderately branched, woody caudices). Stems 3–10 (–15), green throughout or purple-red-tinted proximally, branched distally, glabrous or ± sparsely hairy. Leaves: blades simple or lobed (lobes 3–13), glabrous or sparsely hairy, glanddotted; mid leaves lobed (lobes 3–7, terminal lobes 1.5–2.3 mm wide). Heads 10–85+ per plant, in paniculiform to corymbiform arrays. Peduncles (1–) 2–4.5 cm, glabrous or ± hairy. Involucres subhemispheric to campanulate, 8–11 × 12–15 mm. Phyllaries in 2 series, unequal; outer 10–12, basally connate 1/4–1/2 their lengths (moderately to strongly keeled), ovate to lanceolate, 4.5–7 mm, apices acuminate to acute; inner 13–18 (–28), obovate, 4–6 mm, apices usually mucronate. Ray-florets 9–12; corollas yellow, 10–16 × 4–6.5 mm. Disc-florets 50–125+; corollas 3.5–4.2 mm. Cypselae obpyramidal to narrowly obpyramidal, 2.5–3.5 mm; pappi of 5 (–6) obovate, aristate scales (1.5–) 2.1–2.8 mm. 2n = 30.


Phenology: Flowering (Jun–)Jul–Aug(–Sep).
Habitat: Roadsides, open areas, meadows, on slopes, along drainages and streams
Elevation: (800–)1400–2200(–3200) m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Hymenoxys lemmonii"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
Mark W. Bierner +
(Greene) Cockerell +
decurrent +
Picradenia lemmonii +
hairy +  and glabrous +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Lemmon’s rubberweed or bitterweed +
1 cm10 mm <br />0.01 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
hairy +  and glabrous +
obpyramidal +  and narrowly obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +, Nev. +  and Utah. +
(800–)1400–2200(–3200) m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides, open areas, meadows, on slopes, along drainages and streams +
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 />) +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
subhemispheric;campanulate +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
ovate +  and lanceolate +
unequal +  and subequal +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
2-carpellate +
persistent +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
hairy +  and glabrous +
2 cm20 mm <br />0.02 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
Flowering (Jun–)Jul–Aug(–Sep). +
28 +  and 50 +
Bull. Torrey Bot. Club +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
conic;ovoid;conic;ovoid;hemispheric +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
aristate +  and obovate +
0.21 cm2.1 mm <br />0.0021 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
exalbuminous +
subequal;unequal +
green throughout or purple-red-tinted +
3 +  and 10 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Dugaldia +  and Plummera +
Hymenoxys lemmonii +
Hymenoxys +
species +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
shrub +  and subshrub +