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.
Revision as of 22:38, 29 July 2020 by imported>Volume Importer
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

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 +