Senecio integerrimus |
Senecio cannabifolius |
|||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
Aleutian ragwort |
|||||||||||||||||
Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Perennials, (50–)100–150+ cm (rhizomes fibrous-rooted). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
unevenly tomentose, glabrescent, except persistently hairy on abaxial faces of leaves. |
||||||||||||||||
Stems | single. |
single. |
||||||||||||||||
Leaves | 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 (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 | usually ± 8 or ± 13, sometimes 0; corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety). |
± 5; corolla laminae ca. 10 mm. |
||||||||||||||||
Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
± 13, 4–6 mm, tips green. |
||||||||||||||||
Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
0 or of 1–5+ subulate bractlets (lengths about 1/3 phyllaries). |
||||||||||||||||
Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
20–50 in corymbiform arrays. |
||||||||||||||||
Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
glabrous. |
||||||||||||||||
2n | = 40, 80. |
= 40. |
||||||||||||||||
Senecio integerrimus |
Senecio cannabifolius |
|||||||||||||||||
Phenology | Flowering summer. | |||||||||||||||||
Habitat | Open meadows and slopes | |||||||||||||||||
Elevation | 0–100 m (0–300 ft) | |||||||||||||||||
Distribution |
CA; CO; IA; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
|
AK; Eurasia |
||||||||||||||||
Discussion | 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.) |
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.) |
||||||||||||||||
Key |
|
|||||||||||||||||
Source | FNA vol. 20, p. 556. | FNA vol. 20, p. 569. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | Jacobaea cannabifolia, S. palmatus | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Lessing: Linnaea 6: 242. (1831) | ||||||||||||||||
Web links |
|