Isocoma pluriflora

(Torrey & A. Gray) Greene

Erythea 2: 111. 1894.

Common names: Southern jimmyweed
Illustrated
Basionym: Linosyris pluriflora Torrey & A. Gray Fl. N. Amer. 2: 233. 1842
Synonyms: Haplopappus heterophyllus (A. Gray) S. F. Blake Haplopappus pluriflorus (Torrey & A. Gray) H. M. Hall Isocoma wrightii (A. Gray) Rydberg
Treatment appears in FNA Volume 20. Treatment on page 445. Mentioned on page 440.

Herbage usually glabrous or sparsely hispidulous, sometimes densely hirtellous, leaves sometimes stipitate-glandular, never resinous. Leaf-blades oblanceolate to narrowly oblong-oblanceolate or nearly linear, mostly 10–40 (–50) mm, margins usually entire (hispidulous-cilate, sometimes also on faces), sometimes shallowly toothed distally (especially along western margin of range; teeth in 1 (–3) pairs). Involucres 3.2–5.5 × 2.5–4 mm. Phyllary apices yellowish, or if green, then margins scarious, not aristate, gland-dotted, without resin pockets. Florets (8–) 11–17 (–21); corollas 5–6 mm. Cypsela ribs not forming hornlike extensions. 2n = 12, 24.


Phenology: Flowering (Apr–)Jul–Oct.
Habitat: Igneous or calcareous substrates, sometimes over gypsum, sandy or clay loam, commonly with Larrea-Prosopis
Elevation: 400–1400(–1600) m

Distribution

V20-1022-distribution-map.gif

Ariz., N.Mex., Tex., Mexico (Chihuahua), Mexico (Coahuila)

Discussion

Like other species of Isocoma, I. pluriflora usually is gland-dotted, but scattered plants are stipitate-glandular.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Isocoma pluriflora"
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 +
(Torrey & A. Gray) Greene +
decurrent +
Linosyris pluriflora +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
oblanceolate +  and narrowly oblong-oblanceolate or nearly linear +
linear;oblanceolate or obovate +
rugulose +  and muricate +
Southern jimmyweed +
not 2-lipped +  and actinomorphic +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
subterete +, terete +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, N.Mex. +, Tex. +, Mexico (Chihuahua) +  and Mexico (Coahuila) +
400–1400(–1600) m +
gland-dotted;gland-dotted +
sericeous +, tomentose +, glabrous +, villous +  and hispidulous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Igneous or calcareous substrates, sometimes over gypsum, sandy or clay loam, commonly with Larrea-Prosopis +
indeterminate +
heterogamous +  and homogamous +
hirtellous +, hispidulous +  and glabrous +
each +  and sessile +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
obconic;turbinate or campanulate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
resinous +
stipitate-glandular +
deltate +
gland-dotted +
not aristate +  and toothed +
2-carpellate +
persistent +
Flowering (Apr–)Jul–Oct. +
oblong +  and elliptic-lanceolate +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
concave;usually flat;conic +
exalbuminous +
Illustrated +
eglandular +  and few-branched +
resinous +
gland-dotted +
stipitate-glandular +, tomentose +, villous +, hispidulous +  and glabrous +
appendaged +  and truncate +
papillate +  and smooth +
Haplopappus heterophyllus +, Haplopappus pluriflorus +  and Isocoma wrightii +
Isocoma pluriflora +
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 />) +