Senecio triangularis

Hooker

Fl. Bor.-Amer. 1: 332, plate 115. 1834.

Endemic
Synonyms: Senecio gibbonsii Greene Senecio saliens Rydberg Senecio triangularis var. angustifolius G. N. Jones
Treatment appears in FNA Volume 20. Treatment on page 566. Mentioned on page 549.

Perennials, (20–) 50–120 (–200) cm (caudices branched, ± woody). Herbage glabrous or sparsely floccose-tomentose when young. Stems single or loosely clustered. Leaves evenly distributed; petiolate; blades narrowly triangular, (3–) 4–10+ × 2–6 cm, bases usually ± truncate, sometimes tapered, margins usually dentate, rarely subentire (distal leaves subsessile, smaller). Heads 10–30 (–60) in corymbiform to subracemiform arrays. Calyculi of 2–6 bractlets (rarely more than 2 mm). Phyllaries (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. Ray-florets ± 8; corolla laminae 9–15 mm. Cypselae glabrous. 2n = 40, 80.


Phenology: Flowering summer.
Habitat: Damp places, open woodlands, especially rocky stream banks in coniferous forests
Elevation: 100–3300 m

Distribution

V20-1268-distribution-map.gif

Alta., B.C., N.W.T., Yukon, Alaska, PH, Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Wash., Wyo.

Discussion

Plants of Senecio triangularis with narrow, subentire leaves that taper to the petioles are occasionally encountered in acid bogs in Oregon and Washington and less frequently elsewhere. They are regarded as edaphic variants; they have been recognized as var. angustifolius.

Selected References

None.

Lower Taxa

None.
... more about "Senecio triangularis"
not tailed +, rounded +  and obtuse +
papillate +
truncate-penicillate +
scarious +
usually ovate +  and lance-linear +
racemiform +, paniculiform +, corymbiform +  and cymiform +
indeterminate +  and determinate +
Theodore M. Barkley† +
Hooker +
tapered +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
triangular +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
winged;nerved;ribbed +
barbellulate +  and smooth +
white +  and stramineous +
purplish +, reddish +, white +, ochroleucous +, yellow +  and white rarely reddish +
0.9 cm9 mm <br />0.009 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
angled +, 5-ribbed +, prismatic +  and cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, N.W.T. +, Yukon +, Alaska +, PH +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Wash. +  and Wyo. +
100–3300 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Damp places, open woodlands, especially rocky stream banks in coniferous forests +
discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
floccose-tomentose +  and glabrous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
turbinate;campanulate +
distributed +
cauline +  and basal +
erect;recurved +
deltate +
subentire +
2-carpellate +
persistent +
Flowering summer. +
mostly oblong +  and lanceolate or linear +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Fl. Bor.-Amer. +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
appendaged +  and truncate +
papillate +
Senecio gibbonsii +, Senecio saliens +  and Senecio triangularis var. angustifolius +
Senecio triangularis +
species +
campanulate +
black +  and green +
denticulate +  and serrate or toothed +
120 cm1,200 mm <br />1.2 m <br /> (200 cm2,000 mm <br />2 m <br />) +
50 cm500 mm <br />0.5 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
100 cm1,000 mm <br />1 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
shrub +  and subshrub +