Senecio rapifolius |
Senecio spartioides |
|
---|---|---|
openwoods ragwort |
broom groundsel, broom senecio, broom-like ragwort, grass-leaf ragwort, many-head groundsel |
|
Habit | Perennials, (20–)30–60 cm (rhizomes branched, spreading or suberect). | Subshrubs, 20–120+ cm (taproots forming woody crowns). |
Herbage | (unevenly purple-tinged, often glaucous) glabrous. |
usually glabrous, sometimes sparsely, unevenly hairy. |
Stems | 1–(2–3). |
usually multiple (branching and arching upward). |
Leaves | progressively reduced distally; petiolate; blades ovate to oblanceolate, 4–8(–9+) × (2–)3–5 cm, bases tapered, margins dentate to incised-dentate (some denticles callous; mid leaves similar, smaller, ± clasping; distal leaves bractlike). |
evenly distributed (proximal often smaller); sessile or obscurely petiolate; blades narrowly linear to filiform (or parted into linear-filiform lobes), 5–10 cm × 1–6 mm, bases ± linear, ultimate margins entire. |
Ray florets | 0. |
± 5 (± 13); corolla laminae 8–12 mm. |
Phyllaries | (± 5) ± 8, 3–4(–5) mm, tips green or brownish. |
usually ± 8, sometimes ± 13, (5–)6–9(–10) mm, tips green or minutely black. |
Calyculi | 0 or of 1–3+ lance-deltate to lance-linear bractlets (mostly less than 1 mm). |
0 or of 1–3+ (minute, inconspicuous) bractlets. |
Heads | 25–60+ in cymiform clusters of 3–12. |
10–20(–60) in compound corymbiform arrays (involucres cylindric or narrowly campanulate, 3–6 mm diam.). |
Cypselae | glabrous. |
usually hirtellous, sometimes glabrous. |
2n | = 40. |
= 40. |
Senecio rapifolius |
Senecio spartioides |
|
Phenology | Flowering late summer–early fall. | Flowering summer–fall. |
Habitat | Rocky hillsides and cliffs in coniferous wooded areas | Open, dry disturbed sites, especially stream banks and hillsides |
Elevation | 1800–2800 m (5900–9200 ft) | 1000–3500 m (3300–11500 ft) |
Distribution |
CO; ID; SD; WY
|
AZ; CA; CO; NE; NM; NV; SD; TX; UT; WY
|
Discussion | Plants with the leaves parted into lobes that are seldom more than 1 mm wide have been recognized as Senecio spartioides var. multicapitatus (or as S. multicapitatus); expression of the character is inconsistent throughout the range and recognition of the two entities is all but impossible to maintain. Senecio spartioides apparently hybridizes with S. eremophilus in Garfield County, Utah, and perhaps elsewhere (cf., Holmgren, Reveal, and LaFrance 3463, BRY, KSC, NY). The name Senecio toiyabensis rests upon materials that suggest introgression with S. fremontii. Some specimens usually referred to 41. S. pattersonensis suggest introgression with S. spartioides. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 20, p. 553. | FNA vol. 20, p. 559. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. andersonii, S. incurvus, S. multicapitatus, S. serra var. sanctus, S. spartioides var. granularis, S. toiyabensis | |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 409. (1841) | Torrey & A. Gray: Fl. N. Amer. 2: 438. (1843) |
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