Senecio triangularis

Hooker

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

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.
Revision as of 18:41, 24 September 2019 by FNA>Volume Importer

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"
Theodore M. Barkley† +
Hooker +
Alta. +, B.C. +, N.W.T. +, Yukon +, Alaska +, PH +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Wash. +  and Wyo. +
100–3300 m +
Damp places, open woodlands, especially rocky stream banks in coniferous forests +
Flowering summer. +
Fl. Bor.-Amer. +
Senecio gibbonsii +, Senecio saliens +  and Senecio triangularis var. angustifolius +
Senecio triangularis +
species +