Flora of North America species comparison

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Senecio cannabifolius

Aleutian ragwort
Habit Perennials, (50–)100–150+ cm (rhizomes fibrous-rooted).
Herbage

unevenly tomentose, glabrescent, except persistently hairy on abaxial faces of leaves.
Stems

single.
Leaves

± evenly distributed (basal and proximal withering before flowering); mostly petiolate (proximal);

blades oblong or ovate to oblong-lanceolate (pinnately or subpalmately parted, primary lobes 3–6+, lanceolate to lance-linear, 3–8+ cm), 10–20+ × 8–15+ cm, bases ± tapered, ultimate margins serrate (distal leaves similar, sessile, smaller).
Ray florets

± 5;

corolla laminae ca. 10 mm.
Phyllaries

± 13, 4–6 mm, tips green.
Calyculi

0 or of 1–5+ subulate bractlets (lengths about 1/3 phyllaries).
Heads

20–50 in corymbiform arrays.
Cypselae

glabrous.
2n

= 40.

Senecio cannabifolius
Phenology Flowering summer.
Habitat Open meadows and slopes
Elevation 0–100 m (0–300 ft)
Distribution
from FNA
AK; Eurasia
[BONAP county map]
Discussion

Senecio cannabifolius barely enters the flora from far-eastern Asia. Infraspecific taxa are recognized within S. cannabifolius in some floras of Asiatic regions; our plants are referable to var. cannabifolius.

Senecio cannabifolius has been treated in Jacobaea by E. Wiebe (2000); see discussion under 53. S. jacobaea.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 569.
Parent taxa 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. 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 Jacobaea cannabifolia, S. palmatus
Name authority Lessing: Linnaea 6: 242. (1831)
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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