Hymenoxys jamesii

Bierner

Madroño 40: 43. 1993.

Common names: James’s rubberweed
EndemicConservation concern
Treatment appears in FNA Volume 21. Treatment on page 443. Mentioned on page 435, 436.

Biennials or perennials, 30–120 cm (monocarpic; sometimes with sparingly branched, woody caudices). Stems 1–4 (–20), usually purple-red-tinted proximally, branched distally, ± hairy. Leaves: blades simple or lobed (lobes 3–9), ± hairy, glanddotted; mid leaves lobed (lobes 3–5, terminal lobes 0.8–2.2 mm wide). Heads (30–) 50–180 (–330) per plant, in paniculiform to corymbiform arrays. Peduncles 1.3–5 cm, ± hairy. Involucres subhemispheric to campanulate, 4–7 × 4–8 mm. Phyllaries in 2 series, unequal; outer 8–10, basally connate 1/3 their lengths, ovate to lanceolate, 2.9–5.5 mm, apices acuminate to acute; inner 8–14, obovate, 2.8–4.2 mm, apices mucronate. Ray-florets 7–9; corollas yellow, 4.2–8 × 2.3–5 mm. Disc-florets 30–75+; corollas 2.4–3 mm. Cypselae narrowly obpyramidal, 1.6–2.1 mm; pappi of 4–5 (–8) usually obovate, sometimes aristate, scales 0.8–2.1 mm. 2n = 30.


Phenology: Flowering (Jun–)Jul–Aug(–Sep).
Habitat: Roadsides, open areas, edges of juniper-pine forests
Elevation: 2000–2400 m

Discussion

Of conservation concern.

Hymenoxys jamesii is known from the Mogollon Plateau area.

Selected References

None.

Lower Taxa

None.
... more about "Hymenoxys jamesii"
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 +
Bierner +
decurrent +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
James’s rubberweed +
0.42 cm4.2 mm <br />0.0042 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.23 cm2.3 mm <br />0.0023 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
hairy +  and glabrous +
obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
2000–2400 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides, open areas, edges of juniper-pine forests +
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 />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
subhemispheric;campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
ovate +  and lanceolate +
unequal +  and subequal +
0.29 cm2.9 mm <br />0.0029 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
2-carpellate +
persistent +
1.3 cm13 mm <br />0.013 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Flowering (Jun–)Jul–Aug(–Sep). +
28 +  and 50 +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
conic;ovoid;conic;ovoid;hemispheric +
4 +  and 5 +
aristate +  and obovate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
exalbuminous +
subequal;unequal +
Endemic +  and Conservation concern +
4 (?) +  and 20 (?) +
purple-red-tinted +
1 +  and 4 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Dugaldia +  and Plummera +
Hymenoxys jamesii +
Hymenoxys +
species +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
perennial +  and biennial +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
shrub +  and subshrub +