Flora of North America species comparison

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Senecio lugens

Senecio aronicoides
Senecio lugens

black-tip groundsel, small blacktip ragwort

butterweed, rayless groundsel, rayless ragwort
Habit Perennials, (10–)20–35(–50) cm (rhizomes suberect to creeping). Perennials (biennials?), 30–90 cm (caudices buttonlike, roots unbranched, fleshy-fibrous).
Herbage

loosely, often unevenly, floccose-tomentose, glabrescent.

loosely and sparsely arachnose to finely tomentose, unevenly glabrescent.
Stems

single or clustered.

single.
Leaves

reduced distally; petiolate;

blades narrowly obovate to oblanceolate, (4–)8–18(–25) cm, bases tapered, margins subentire to dentate (denticles callous; mid and distal leaves bractlike, clasping).

progressively reduced distally; petiolate;

blades ovate or oblanceolate to oblong, 7–20 × 2–3 cm, bases broadly to narrowly tapered, margins repand-denticulate or sublaciniate to subentire (mid and distal leaves sessile, smaller, weakly clasping).
Ray florets

(± 5) ± 8 (± 13);

corolla laminae 8–10(–15) mm.

0 or 1–2;

corolla laminae 4–7 mm.
Phyllaries

(± 8) ± 13 (± 21), 4–7 mm, tips black.

± 8 or ± 13, 4–8 mm, tips green or black.
Calyculi

of 2–5 linear bractlets (1–2 mm).

0 or of 1–3+ oblong to linear bractlets (seldom more than 1.5 mm).
Heads

(2–)7–12(–20+) in corymbiform arrays.

(6–)15–30+ in corymbiform arrays.
Cypselae

glabrous.

glabrous.
2n

= 40, 80.

= 40.

Senecio lugens

Senecio aronicoides
Phenology Flowering summer. Flowering spring–early summer.
Habitat Moist meadows, gravelly streambeds, open woods in alpine or boreal sites Dry or drying sites in open woodlands, upper foothills and montane forests
Elevation 200–2500 m (700–8200 ft) 800–2500 m (2600–8200 ft)
Distribution
from FNA
AK; MT; WA; WY; AB; BC; NT; YT
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Senecio lugens varies greatly in robustness across its range. It is scattered widely in the Rocky Mountain uplift and adjacent regions from northern Wyoming to Alaska; it is disjunct in the Olympic Peninsula, Washington. Superficially similar to S. integerrimus, S. lugens has well-developed, coarse, spreading rootstocks with branching roots; S. integerrimus arises from foreshortened, buttonlike caudices with abundant unbranched, fleshy-fibrous roots.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 554. FNA vol. 20, p. 556.
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. 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. 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. 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. 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
Synonyms S. glaucescens, S. imbricatus, S. integerrimus var. lugens S. leptolepis, S. rawsonianus
Name authority Richardson: in J. Franklin et al., Narr. Journey Polar Sea, 748. (1823) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 426. (1838)
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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