Balsamorhiza sericea |
Balsamorhiza subg. Balsamorhiza |
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silky balsamroot, silvery balsamroot |
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Stems | 6–38 cm, sericeous; from single taproot. |
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Leaves | ovate-lanceolate, 1-pinnately divided almost or entirely to midribs, often more deeply divided proximally than distally; margins entire or few-toothed, occasionally some lower leaves serrate on lower margins; surfaces sericeous; more densely so abaxially than adaxially; basal leaves in 1–few rosettes; blades 3–18 × 1–7 cm; pinnae 6–16 mm wide; petioles 3–17 cm; cauline leaves in 1 pair; opposite, reduced; blades 2.5–4 × 1–1.6 cm; petioles 2.5–4 cm. |
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Inflorescences | with 1 terminal head. |
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Involucres | 12–15 × 15–22 mm. |
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Ray florets | 13–14, yellow; rays 12–20 × 5–8 mm. |
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Disc florets | ~9 mm. |
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Phyllaries | ovate, 10–17 × 5–9 mm; tips acuminate, sericeous. |
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Fruits | 6–7 × 1.5 mm, glabrous. |
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Paleae | 13–14 mm. |
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Balsamorhiza sericea |
Balsamorhiza subg. Balsamorhiza |
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Distribution | ||
Discussion | Serpentine. Flowering Apr–May. 400–600 m. Sisk. CA. Native. Balsamorhiza sericea is endemic to serpentine-influenced soils and is thus far known only from Josephine County, Oregon, and adjacent Siskiyou and Trinity counties, California. The specific epithet “sericea” refers to the pubescence. |
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Source | Flora of Oregon, volume 2, page 201 Abigail (Abby) Moore |
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Sibling taxa | ||
Synonyms | Balsamorhiza macrolepis, Balsamorhiza macrolepis var. platylepis, Balsamorhiza platylepis | |
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