Senecio triangularis |
Senecio parryi |
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arrowleaf groundsel |
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Habit | Herbs perennial, (2)5–12(20) dm; caudices branching, woody, rhizomatous. | |
Stems | 1 or 2–4 and loosely clustered, glabrous or sparsely pubescent. |
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Leaves | basal present at flowering; cauline ± evenly distributed along stems, gradually reduced distally, narrowly to widely triangular, bases tapered to truncate or cordate; margins dentate, rarely subentire; surfaces sparsely tomentose to nearly glabrous; proximal petiolate; distal sessile. |
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Inflorescences | corymb- or ± raceme-like arrays; bracts conspicuous. |
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Involucres | cylindric to narrowly campanulate. |
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Ray florets | ~8; rays 9–15 mm. |
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Disc florets | 35–45. |
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Phyllaries | (8)13(21), 6–10 mm; tips green, rarely black. |
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Calyculi | 2–6 bractlets, inconspicuous, rarely > 2 mm. |
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Fruits | 2.5–3.5 mm, glabrous. |
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Heads | 10–30(60). |
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2n | =40, 80. |
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Senecio triangularis |
Senecio parryi |
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Distribution | ||
Discussion | Open areas, rocky streambanks, wet meadows, bogs, damp places in coniferous forests. Flowering May–Sep. 0–2800 m. BR, BW, Casc, CR, ECas, Est, Lava, Sisk, WV. CA, ID, NV, WA; north to AK, northeast to MT, east to WY, southeast to NM. Native. Some plants with narrow, subentire leaves that taper to the petioles have been found in acidic bogs in Washington and Oregon. A few authors recognize these as variety angustifolia. However, this author has observed several specimens (specifically indicated as being collected in bogs) that had both narrower leaves and the wider leaves more typical of variety triangularis on the same plant. |
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Source | Flora of Oregon, volume 2, page 341 Debra Trock |
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Sibling taxa | ||
Synonyms | Senecio gibbonsii, Senecio triangularis var. angustifolius, Senecio triangularis var. triangularis | |
Web links |
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