Flora of North America species comparison

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Senecio megacephalus

Senecio blochmaniae

large-head groundsel, rocky ragwort

Blochman's ragwort, dune ragwort
Habit Perennials, (15–)30–50 cm (rhizomes woody, suberect or creeping). Subshrubs, 45–130 cm (taproots forming woody crowns).
Herbage

loosely arachno-tomentose, unevenly glabrescent.

glabrous or sparsely hairy.
Stems

single or clustered.

usually multiple (arching upwards).
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).

evenly distributed (often crowded; proximal often withering and pendulous);

sessile or ± petiolate;

blades linear-filiform, 3–12 cm × 1–3 mm, bases ± linear, margins entire.
Ray florets

± 13;

corolla laminae (5–)15–20 mm.

± 8;

corolla laminae 8–10 mm.
Phyllaries

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

± 13, 7–10 mm, tips green.
Calyculi

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

0 or of 1–3+ lance-deltate to linear bractlets (lengths to 1/4 phyllaries).
Heads

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

5–20 in corymbiform arrays (involucres campanulate).
Cypselae

glabrous.

hirtellous (canescent).
2n

= 40.

= 40.

Senecio megacephalus

Senecio blochmaniae
Phenology Flowering summer. Flowering summer–early fall.
Habitat Rocky, moist or drying sites, especially on mountain slopes Coastal sand dunes and sandy, open flood plains
Elevation 1500–2500 m (4900–8200 ft) 0–100 m (0–300 ft)
Distribution
from FNA
ID; MT; WY; AB; BC
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 553. FNA vol. 20, p. 560.
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. 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
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 410. (1841) Greene: Erythaea 1: 7. (1893)
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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