Flora of North America species comparison

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Senecio sheldonensis

Mount Sheldon butterweed, Mount Sheldon ragwort, Mt. Sheldon ragwort
Habit Perennials, 30–40(–50) cm (caudices branched, fibrous-rooted).
Herbage

glabrous or with scattered hairs near leaf bases and among heads.
Stems

single or loosely clustered.
Leaves

evenly distributed;

petiolate or subsessile;

blades lanceolate, 4–10 × 2–4 cm, bases ± tapered, margins denticulate (distal leaves sessile, smaller).
Ray florets

± 8;

corolla laminae ± 10 mm.
Phyllaries

± 13, 7–10 mm, tips black (hairy).
Calyculi

of 3–7 bractlets (0.5–3 mm).
Heads

(1–)3–5(–6) in cymiform arrays.
Cypselae

glabrous.

Senecio sheldonensis
Phenology Flowering late Jul–mid Aug.
Habitat Subalpine meadows and valleys
Elevation 1200–1800 m (3900–5900 ft)
Distribution
from FNA
BC; NT; YT
[BONAP county map]
Discussion

Senecio sheldonensis is infrequently collected and poorly understood. The treatment here is provisional.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 567.
Parent taxa Asteraceae > tribe Senecioneae > Senecio
Sibling taxa
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, S. atratus, S. bigelovii, S. blochmaniae, S. californicus, S. cannabifolius, S. clarkianus, S. crassulus, S. elegans, S. elmeri, S. eremophilus, S. ertterae, S. erucifolius, S. flaccidus, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. jacobaea, S. lemmonii, S. lugens, S. lyonii, S. megacephalus, S. mohavensis, S. multidentatus, S. neowebsteri, S. parryi, S. pattersonensis, S. pseudoarnica, S. pudicus, S. quaylei, S. rapifolius, S. riddellii, S. sacramentanus, S. scorzonella, S. serra, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
Name authority A. E. Porsild: Canad. Field-Naturalist 64: 43. (1950)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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