Hymenoxys rusbyi

(A. Gray) Cockerell

Bull. Torrey Bot. Club 31: 496. 1904.

Common names: Rusby’s rubberweed or bitterweed
Endemic
Basionym: Actinella rusbyi A. Gray Proc. Amer. Acad. Arts 19: 33. 1883
Treatment appears in FNA Volume 21. Treatment on page 443. Mentioned on page 435, 436.

Perennials, 30–150 cm (polycarpic, often with moderately branched, woody caudices). Stems 1–5 (–15), usually purple-red-tinted proximally, branched distally, glabrous or ± hairy. Leaves: blades simple or lobed (lobes 3), glabrous, glanddotted; mid leaves simple or lobed (lobes 3, terminal lobes 2–4 mm wide). Heads 50–250+ per plant, in corymbiform arrays. Peduncles 1–3.2 cm, glabrous or ± hairy. Involucres campanulate to urceolate, 6–8 × 6–7 mm. Phyllaries in 2 series, unequal; outer 7–9, basally connate 1/4–1/3 their lengths, lanceolate, 4.5–6 mm, apices usually rounded; inner 7–11, obovate, 3.5–4.5 mm, apices mucronate. Ray-florets 6–8; corollas yellow, 4.5–8 × 2.5–5 mm. Disc-florets 25–50+; corollas 2.7–3.2 mm. Cypselae narrowly obpyramidal, 2–3 mm; pappi usually of 5 obovate, sometimes aristate, scales 0.9–1.8 mm. 2n = 30.


Phenology: Flowering Jul–Aug(–Oct).
Habitat: Roadsides, open areas, edges of forests
Elevation: 1600–2100 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Hymenoxys rusbyi"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
mucronate;rounded +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Mark W. Bierner +
(A. Gray) Cockerell +
decurrent +
Actinella rusbyi +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Rusby’s rubberweed or bitterweed +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
hairy +  and glabrous +
obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +  and N.Mex. +
1600–2100 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides, open areas, edges of 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 />) +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
campanulate;urceolate +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
unequal +  and subequal +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
2-carpellate +
persistent +
aristate +
hairy +  and glabrous +
1 cm10 mm <br />0.01 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
Flowering Jul–Aug(–Oct). +
28 +  and 50 +
Bull. Torrey Bot. Club +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
conic;ovoid;conic;ovoid;hemispheric +
2 +  and 11 +
aristate +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
exalbuminous +
subequal;unequal +
5 (?) +  and 15 (?) +
purple-red-tinted +
hairy +  and glabrous +
1 +  and 5 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Dugaldia +  and Plummera +
Hymenoxys rusbyi +
Hymenoxys +
species +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
shrub +  and subshrub +