Flora of North America species comparison

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Senecio atratus

Senecio sheldonensis

tall blacktip ragwort

Mount Sheldon butterweed, Mount Sheldon ragwort, Mt. Sheldon ragwort
Habit Perennials, (20–)35–70(–80+) cm (rhizomes or caudices branched, erect to weakly creeping). Perennials, 30–40(–50) cm (caudices branched, fibrous-rooted).
Herbage

floccose-tomentose to canescent, sometimes unevenly glabrescent.

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

1–(2–5).

single or loosely clustered.
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).

evenly distributed; petiolate or subsessile;

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

(± 3) ± 5;

corolla laminae 5–8 mm.

± 8;

corolla laminae ± 10 mm.
Phyllaries

(± 5) ± 8, 6–8 mm, tips black.

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

of 2–5 linear bractlets (lengths to 1/3 phyllaries).

of 3–7 bractlets (0.5–3 mm).
Heads

20–60+ in corymbiform or subpaniculiform arrays.

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

glabrous.

glabrous.
2n

= 40. (A report of 2n = 46 is presumably erroneous.)

Senecio atratus

Senecio sheldonensis
Phenology Flowering late spring–early fall. Flowering late Jul–mid Aug.
Habitat Dry or drying, rocky or sandy sites in coniferous areas, especially sites with frequent disturbance Subalpine meadows and valleys
Elevation 2800–4000 m (9200–13100 ft) 1200–1800 m (3900–5900 ft)
Distribution
from FNA
CO; NM; UT; WY
[WildflowerSearch map]
[BONAP county map]
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. 554. FNA vol. 20, p. 567.
Parent taxa Asteraceae > tribe Senecioneae > Senecio Asteraceae > tribe Senecioneae > Senecio
Sibling taxa
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, 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. sheldonensis, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
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
Synonyms S. atratus var. milleflorus, S. milleflorus
Name authority Greene: Pittonia 3: 105. (1896) 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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