Senecio spartioides |
Senecio atratus |
|
---|---|---|
broom groundsel, broom senecio, broom-like ragwort, grass-leaf ragwort, many-head groundsel |
tall blacktip ragwort |
|
Habit | Subshrubs, 20–120+ cm (taproots forming woody crowns). | Perennials, (20–)35–70(–80+) cm (rhizomes or caudices branched, erect to weakly creeping). |
Herbage | usually glabrous, sometimes sparsely, unevenly hairy. |
floccose-tomentose to canescent, sometimes unevenly glabrescent. |
Stems | usually multiple (branching and arching upward). |
1–(2–5). |
Leaves | 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. |
progressively reduced distally; petiolate; blades oblong-ovate to oblanceolate, (5–)10–30 × 1.5–4(–6) cm, bases tapered, margins dentate (denticles, dark, callous; mid leaves similar, sessile, smaller; distal leaves bractlike). |
Ray florets | ± 5 (± 13); corolla laminae 8–12 mm. |
(± 3) ± 5; corolla laminae 5–8 mm. |
Phyllaries | usually ± 8, sometimes ± 13, (5–)6–9(–10) mm, tips green or minutely black. |
(± 5) ± 8, 6–8 mm, tips black. |
Calyculi | 0 or of 1–3+ (minute, inconspicuous) bractlets. |
of 2–5 linear bractlets (lengths to 1/3 phyllaries). |
Heads | 10–20(–60) in compound corymbiform arrays (involucres cylindric or narrowly campanulate, 3–6 mm diam.). |
20–60+ in corymbiform or subpaniculiform arrays. |
Cypselae | usually hirtellous, sometimes glabrous. |
glabrous. |
2n | = 40. |
= 40. (A report of 2n = 46 is presumably erroneous.) |
Senecio spartioides |
Senecio atratus |
|
Phenology | Flowering summer–fall. | Flowering late spring–early fall. |
Habitat | Open, dry disturbed sites, especially stream banks and hillsides | Dry or drying, rocky or sandy sites in coniferous areas, especially sites with frequent disturbance |
Elevation | 1000–3500 m (3300–11500 ft) | 2800–4000 m (9200–13100 ft) |
Distribution |
AZ; CA; CO; NE; NM; NV; SD; TX; UT; WY
|
CO; NM; 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. 559. | FNA vol. 20, p. 554. |
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 | S. atratus var. milleflorus, S. milleflorus |
Name authority | Torrey & A. Gray: Fl. N. Amer. 2: 438. (1843) | Greene: Pittonia 3: 105. (1896) |
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