lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel
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cut-leaf groundsel, desert ragwort, dryland ragwort, Elmer's butterweed
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Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). |
Perennials, (20–)40–80(–140) cm (caudices branched, fibrous-rooted). |
arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
glabrous or glabrate. |
single. |
single or loosely clustered. |
progressively reduced distally; ± petiolate; blades elliptic, lanceolate, linear, oblanceolate, rounded-deltate, or suborbiculate, 6–25 × 1–6 cm, bases ± tapered or truncate to cordate, margins entire or ± dentate (distal leaves sessile, bractlike). |
± evenly distributed (proximal often withering before flowering); petiolate or sessile; blades ovate or lanceolate to narrowly lanceolate, (3–)6–12(–20) × (1–)1.5–5(–7) cm, bases tapered, margins usually pinnate to lacerate, sometimes dentate. |
usually ± 8 or ± 13, sometimes 0; corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety). |
± 8; corolla laminae 5–10 mm. |
usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
(± 8) ± 13, 3–8+ mm, tips green or black. |
of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of 3–5+ (prominent or inconspicuous) bractlets (lengths to 3/4 phyllaries). |
6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
10–60+ in compound corymbiform arrays. |
usually glabrous, sometimes hirtellous (mostly on angles). |
usually glabrous, sometimes hirtellous. |
= 40, 80. |
= 38, 40, 44. |
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CA; CO; IA; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
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AK; AZ; CO; MT; ND; NM; SD; UT; WY; AB; BC; MB; NT; ON; SK; w North America; Mostly n North America
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Varieties 5 (5 in the flora). The varieties of Senecio integerrimus are distinguished by morphology and geography. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 3 (3 in the flora). Varieties of Senecio eremophilus are distinguished by head size and distribution. Varieties eremophilus and macdougalii are notably different; var. kingii is intermediate in both morphology and distribution. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
1. Basal leaves with distinct petioles, blades usually ovate to rounded-deltate, sometimes obovate to oblanceolate; ray corollas white or ochroleucous | var. ochroleucus |
1. Basal leaves with or without distinct petioles, blades elliptic, lanceolate, oblanceolate, rounded-deltate, sublinear, or suborbiculate; ray corollas yellow (or rays 0) | → 2 |
2. Herbage glabrous or glabrate at flowering (except in leaf axils and among heads); phyllaries linear-subulate, tips usually green, minutely (if at all) black | var. integerrimus |
2. Herbage usually arachnose, tomentose, or villous at flowering; phyllaries lanceolate to linear-subulate, tips black (if minutely so, then narrowly lanceolate and broader than subulate) | → 3 |
3. Basal and proximal leaves oblong or lanceolate to sublinear; heads 3–6(–16+); phyllaries 10–15+ mm | var. scribneri |
3. Basal and proximal leaves mostly elliptic to oblanceolate, sometimes elliptic or rounded-deltate to suborbiculate; heads usually 6–15(–30+; if fewer than 6, leaves lanceolate or broader); phyllaries 5–12 mm. | → 4 |
4. Plants copiously arachnose, tomentose, or villous at flowering; phyllaries linear-subulate, 8–12 mm, tips minutely, if at all, blackened | var. major |
4. Plants copiously to sparsely arachnose, tomentose, or villous at flowering; phyllaries mostly lanceolate (seldom as narrow as linear-subulate), 5–10 mm, tips black | var. exaltatus |
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1. Calyculi: bractlets prominent (lengths of at least some to about 3/4 phyllaries); involucres 7–10 mm diam.; phyllaries 6–8 mm, tips green or weakly, if at all, black | var. eremophilus |
1. Calyculi: bractlets conspicuous or inconspicuous (lengths rarely to 1/2 phyllaries); involucres 5–8 mm diam.; phyllaries 3–6 mm, tips usually black | → 2 |
2. Calyculi: bractlets conspicuous (lengths to 1/2 phyllaries); involucres (5–)6–8 diam.; phyllaries ± 13, (4–)5–6 mm | var. kingii |
2. Calyculi: bractlets inconspicuous; involucres 4–5(–6) mm diam.; phyllaries ± 8 or ± 13, 3–5 mm | var. macdougalii |
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FNA vol. 20, p. 556. |
FNA vol. 20, p. 565. |
Asteraceae > tribe Senecioneae > Senecio |
Asteraceae > tribe Senecioneae > Senecio |
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. 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. 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 |
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Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) |
Richardson: in J. Franklin et al., Narr. Journey Polar Sea, 759. (1823) |
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