Senecio spartioides |
Senecio triangularis |
|
---|---|---|
broom groundsel, broom senecio, broom-like ragwort, grass-leaf ragwort, many-head groundsel |
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
|
Habit | Subshrubs, 20–120+ cm (taproots forming woody crowns). | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). |
Herbage | usually glabrous, sometimes sparsely, unevenly hairy. |
glabrous or sparsely floccose-tomentose when young. |
Stems | usually multiple (branching and arching upward). |
single or loosely clustered. |
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. |
evenly distributed; petiolate; blades narrowly triangular, (3–)4–10+ × 2–6 cm, bases usually ± truncate, sometimes tapered, margins usually dentate, rarely subentire (distal leaves subsessile, smaller). |
Ray florets | ± 5 (± 13); corolla laminae 8–12 mm. |
± 8; corolla laminae 9–15 mm. |
Phyllaries | usually ± 8, sometimes ± 13, (5–)6–9(–10) mm, tips green or minutely black. |
(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
Calyculi | 0 or of 1–3+ (minute, inconspicuous) bractlets. |
of 2–6 bractlets (rarely more than 2 mm). |
Heads | 10–20(–60) in compound corymbiform arrays (involucres cylindric or narrowly campanulate, 3–6 mm diam.). |
10–30(–60) in corymbiform to subracemiform arrays. |
Cypselae | usually hirtellous, sometimes glabrous. |
glabrous. |
2n | = 40. |
= 40, 80. |
Senecio spartioides |
Senecio triangularis |
|
Phenology | Flowering summer–fall. | Flowering summer. |
Habitat | Open, dry disturbed sites, especially stream banks and hillsides | Damp places, open woodlands, especially rocky stream banks in coniferous forests |
Elevation | 1000–3500 m (3300–11500 ft) | 100–3300 m (300–10800 ft) |
Distribution |
AZ; CA; CO; NE; NM; NV; SD; TX; UT; WY
|
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
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.) |
Plants of Senecio triangularis with narrow, subentire leaves that taper to the petioles are occasionally encountered in acid bogs in Oregon and Washington and less frequently elsewhere. They are regarded as edaphic variants; they have been recognized as var. angustifolius. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 559. | FNA vol. 20, p. 566. |
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. gibbonsii, S. saliens, S. triangularis var. angustifolius |
Name authority | Torrey & A. Gray: Fl. N. Amer. 2: 438. (1843) | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) |
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