Isocoma rusbyi

Greene

Leafl. Bot. Observ. Crit. 1: 170. 1906.

Common names: Rusby’s jimmyweed
Endemic
Synonyms: Haplopappus rusbyi (Greene) Cronquist
Treatment appears in FNA Volume 20. Treatment on page 444. Mentioned on page 440.

Herbage glabrous, not resinous. Leaf-blades narrowly elliptic-oblong to elliptic-obovate, 20–50 mm, margins entire. Involucres (5.5–) 6–9.5 × 5–7.5 mm. Phyllary apices yellowish to greenish yellow, not aristate, sparsely or not at all gland-dotted, without resin pockets. Florets 19–25; corollas 5–6.5 mm. Cypsela ribs slightly surpassing apices, forming hornlike extensions. 2n = 12.


Phenology: Flowering Aug–Oct(–Nov).
Habitat: Rocky or sandy soils, sometimes in clay, usually saline, desert shrub communities, sometimes with scattered junipers
Elevation: 700–1500 m

Distribution

V20-1017-distribution-map.gif

Ariz., Colo., N.Mex., Utah.

Discussion

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Isocoma rusbyi"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Guy L. Nesom +
Greene +
decurrent +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
narrowly elliptic-oblong +  and elliptic-obovate +
linear;oblanceolate or obovate +
rugulose +  and muricate +
Rusby’s jimmyweed +
not 2-lipped +  and actinomorphic +
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
subterete +, terete +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Colo. +, N.Mex. +  and Utah. +
700–1500 m +
gland-dotted;gland-dotted +
sericeous +, tomentose +, glabrous +, villous +  and hispidulous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky or sandy soils, sometimes in clay, usually saline, desert shrub communities, sometimes with scattered junipers +
indeterminate +
heterogamous +  and homogamous +
not resinous +
each +  and sessile +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
obconic;turbinate or campanulate +
0.5 cm5 mm <br />0.005 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
deltate +
toothed +  and pinnatifid +
2-carpellate +
persistent +
Flowering Aug–Oct(–Nov). +
oblong +  and elliptic-lanceolate +
Leafl. Bot. Observ. Crit. +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
concave;usually flat;conic +
exalbuminous +
eglandular +  and few-branched +
resinous +
gland-dotted +
stipitate-glandular +, tomentose +, villous +, hispidulous +  and glabrous +
appendaged +  and truncate +
papillate +  and smooth +
Haplopappus rusbyi +
Isocoma rusbyi +
species +
goblet--shaped +
ampliate +
dark orange-resinous +
120 cm1,200 mm <br />1.2 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
20 cm200 mm <br />0.2 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
120 cm1,200 mm <br />1.2 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +