Senecio aphanactis |
Senecio triangularis |
|
---|---|---|
California groundsel, chaparral ragwort, rayless ragwort |
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
|
Habit | Annuals, 5–20+ cm (taproots relatively short and thin). | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). |
Herbage | glabrous or sparsely tomentose (especially distally). |
glabrous or sparsely floccose-tomentose when young. |
Stems | usually 1 (relatively thin, delicate). |
single or loosely clustered. |
Leaves | evenly distributed; sessile; blades oblanceolate to lance-linear, 2–4 × 0.5–1 cm, bases sometimes weakly clasping, margins usually subpinnate to dentate, sometimes subentire (distal leaves bractlike). |
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 | 0 or 1–5; corolla laminae 0.5–1+ mm (barely surpassing phyllaries, heads perhaps technically disciform). |
± 8; corolla laminae 9–15 mm. |
Phyllaries | ± 8 or ± 13, 5–6 mm, tips greenish. |
(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
Calyculi | 0 or of 1–3+ lance-deltate bractlets. |
of 2–6 bractlets (rarely more than 2 mm). |
Heads | 4–10+ in open, cymiform arrays. |
10–30(–60) in corymbiform to subracemiform arrays. |
Cypselae | densely hairy. |
glabrous. |
2n | = 40. |
= 40, 80. |
Senecio aphanactis |
Senecio triangularis |
|
Phenology | Flowering late winter–spring. | Flowering summer. |
Habitat | Dry, open ground, especially alkaline flats | Damp places, open woodlands, especially rocky stream banks in coniferous forests |
Elevation | 10–400 m (0–1300 ft) | 100–3300 m (300–10800 ft) |
Distribution |
CA; Mexico (Baja California)
|
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
Discussion | Of conservation concern. (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. 563. | FNA vol. 20, p. 566. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. gibbonsii, S. saliens, S. triangularis var. angustifolius | |
Name authority | Greene: Pittonia 1: 220. (1888) | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) |
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