Senecio atratus

Greene

Pittonia 3: 105. 1896.

IllustratedEndemic
Synonyms: Senecio atratus var. milleflorus (Greene) Greenman Senecio milleflorus
Treatment appears in FNA Volume 20. Treatment on page 554. Mentioned on page 547.

Perennials, (20–) 35–70 (–80+) cm (rhizomes or caudices branched, erect to weakly creeping). Herbage floccose-tomentose to canescent, sometimes unevenly glabrescent. Stems 1– (2–5). Leaves progressively reduced distally; petiolate; blades oblong-ovate to oblanceolate, (5–) 10–30 × 1.5–4 (–6) cm, bases tapered, margins dentate (denticles, dark, callous; mid leaves similar, sessile, smaller; distal leaves bractlike). Heads 20–60+ in corymbiform or subpaniculiform arrays. Calyculi of 2–5 linear bractlets (lengths to 1/3 phyllaries). Phyllaries (± 5) ± 8, 6–8 mm, tips black. Ray-florets (± 3) ± 5; corolla laminae 5–8 mm. Cypselae glabrous. 2n = 40.


Phenology: Flowering late spring–early fall.
Habitat: Dry or drying, rocky or sandy sites in coniferous areas, especially sites with frequent disturbance
Elevation: 2800–4000 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Senecio atratus"
not tailed +, rounded +  and obtuse +
papillate +
scarious +
usually ovate +  and lance-linear +
racemiform +, paniculiform +, corymbiform +  and cymiform +
indeterminate +  and determinate +
Theodore M. Barkley† +
Greene +
tapered +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
oblong-ovate;oblanceolate +
1.5cm;4cm +
winged;nerved;ribbed +
barbellulate +  and smooth +
white +  and stramineous +
purplish +, reddish +, white +, ochroleucous +, yellow +  and white rarely reddish +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
angled +, 5-ribbed +, prismatic +  and cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
Colo. +, N.Mex. +, Utah +  and Wyo. +
2800–4000 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Dry or drying, rocky or sandy sites in coniferous areas, especially sites with frequent disturbance +
discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
glabrescent +, floccose-tomentose +  and canescent +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
turbinate;campanulate +
cauline +  and basal +
reduced +
erect;recurved +
deltate +
2-carpellate +
persistent +
Flowering late spring–early fall. +
mostly oblong +  and lanceolate or linear +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
Illustrated +  and Endemic +
2 (?) +  and 5 (?) +
appendaged +  and truncate +
papillate +
Senecio atratus var. milleflorus +  and Senecio milleflorus +
Senecio atratus +
species +
campanulate +
denticulate +  and serrate or toothed +
70 cm700 mm <br />0.7 m <br /> (80 cm800 mm <br />0.8 m <br />) +
35 cm350 mm <br />0.35 m <br /> (70 cm700 mm <br />0.7 m <br />) +
shrub +  and subshrub +