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arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel

Sierra groundsel, Sierra ragwort

Habit Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). Perennials, 10–40(–50) cm (rhizomes stout).
Herbage

glabrous or sparsely floccose-tomentose when young.

closely lanate to floccose-tomentose, unevenly glabrescent.

Stems

single or loosely clustered.

usually single, rarely clustered.

Leaves

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).

reduced distally; obscurely petiolate;

blades oblanceolate to lanceolate, (4–)6–12+ × (1–)1.5–3 cm, bases tapering to winged petioles, margins dentate to denticulate (denticles dark, cartilaginous; mid and distal leaves smaller, bractlike).

Ray florets

± 8;

corolla laminae 9–15 mm.

usually ± 5, sometimes 0;

corolla laminae 5–8(–10) mm.

Phyllaries

(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black.

± 13, 3–5 mm, tips usually black.

Calyculi

of 2–6 bractlets (rarely more than 2 mm).

0 or of 1–3+ lance-deltate to lance-linear bractlets (mostly less than 1 mm).

Heads

10–30(–60) in corymbiform to subracemiform arrays.

(10–)14–24(–30+) in corymbiform arrays.

Cypselae

glabrous.

glabrous.

2n

= 40, 80.

Senecio triangularis

Senecio scorzonella

Phenology Flowering summer. Flowering summer.
Habitat Damp places, open woodlands, especially rocky stream banks in coniferous forests Open wooded areas and subalpine meadows
Elevation 100–3300 m (300–10800 ft) 1600–3500 m (5200–11500 ft)
Distribution
from FNA
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)

Senecio scorzonella is restricted to high elevations in the Sierra Nevada–Cascade uplift and the White Mountains of California; it barely enters adjacent Nevada.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 20, p. 566. FNA vol. 20, p. 554.
Parent taxa Asteraceae > tribe Senecioneae > Senecio Asteraceae > tribe Senecioneae > Senecio
Sibling taxa
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, S. atratus, S. bigelovii, S. blochmaniae, S. californicus, S. cannabifolius, S. clarkianus, S. crassulus, S. elegans, S. elmeri, S. eremophilus, S. ertterae, S. erucifolius, S. flaccidus, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. jacobaea, S. lemmonii, S. lugens, S. lyonii, S. megacephalus, S. mohavensis, S. multidentatus, S. neowebsteri, S. parryi, S. pattersonensis, S. pseudoarnica, S. pudicus, S. quaylei, S. rapifolius, S. riddellii, S. sacramentanus, S. scorzonella, S. serra, S. sheldonensis, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, S. atratus, S. bigelovii, S. blochmaniae, S. californicus, S. cannabifolius, S. clarkianus, S. crassulus, S. elegans, S. elmeri, S. eremophilus, S. ertterae, S. erucifolius, S. flaccidus, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. jacobaea, S. lemmonii, S. lugens, S. lyonii, S. megacephalus, S. mohavensis, S. multidentatus, S. neowebsteri, S. parryi, S. pattersonensis, S. pseudoarnica, S. pudicus, S. quaylei, S. rapifolius, S. riddellii, S. sacramentanus, S. serra, S. sheldonensis, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
Synonyms S. gibbonsii, S. saliens, S. triangularis var. angustifolius S. covillei, S. covillei var. scorzonella
Name authority Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) Greene: Pittonia 3: 90. (1896)
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