Flora of North America species comparison

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Senecio megacephalus

Senecio sacramentanus

large-head groundsel, rocky ragwort

Sacramento ragwort
Habit Perennials, (15–)30–50 cm (rhizomes woody, suberect or creeping). Perennials, 20–50 cm (caudices fibrous-rooted).
Herbage

loosely arachno-tomentose, unevenly glabrescent.

sparsely pubescent to tomentose (especially on abaxial leaf faces and among heads).
Stems

single or clustered.

single or loosely clustered.
Leaves

progressively reduced distally; weakly petiolate;

blades lanceolate to narrowly oblanceolate, 10–18+ × 1–2(–3+) cm, bases tapered, margins entire or wavy (often with dark, cartilaginous denticles; mid leaves similar, smaller, sessile; distal leaves bractlike).

progressively reduced distally;

petiolate;

blades triangular, triangular-lanceolate, or lanceolate, 3–10(–15) × 1.5–4 cm, bases cordate to truncate or tapered, margins serrate or dentate (mid and distal leaves sessile, bractlike).
Ray florets

± 13;

corolla laminae (5–)15–20 mm.

0.
Phyllaries

± 21, 9–12(–14) mm, tips not notably blackened (short-hairy).

± 8, 6–9 mm, tips green.
Calyculi

of 5–8+ linear to filiform bractlets (lengths 1/2–7/8+ phyllaries).

of 2–5+ lance-deltate to filiform bractlets (lengths 1/5–1/2 phyllaries).
Heads

usually 1 (sometimes subtended by 1–2 smaller heads).

nodding, 6–10+ in racemiform-paniculiform arrays.
Cypselae

glabrous.

glabrous.
2n

= 40.

Senecio megacephalus

Senecio sacramentanus
Phenology Flowering summer. Late summer.
Habitat Rocky, moist or drying sites, especially on mountain slopes Montane meadows
Elevation 1500–2500 m (4900–8200 ft) 3000–3500 m (9800–11500 ft)
Distribution
from FNA
ID; MT; WY; AB; BC
[BONAP county map]
from FNA
NM
[BONAP county map]
Source FNA vol. 20, p. 553. FNA vol. 20, p. 550.
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. lugens, S. lyonii, 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. 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
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 410. (1841) Wooton & Standley: Contr. U.S. Natl. Herb. 16: 194. (1913)
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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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