Balsamorhiza hookeri |
Balsamorhiza sericea |
|
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Hooker's balsamroot |
silky balsamroot, silvery balsamroot |
|
Stems | 11–47 cm; hirsute; from single taproot. |
6–38 cm, sericeous; from single taproot. |
Leaves | lanceolate to ovate-lanceolate, 1-pinnately divided with some pinnae toothed or lobed to 3-pinnately lobed; margins entire to crenate or serrate; surfaces hirsute to hirsute-sericeous; basal leaves in 1–few rosettes; blades 12–24 × 4–12 cm; pinnae 1–10 mm wide; petioles 4–15 cm; cauline blades 3–14.5 × 0.6–4 cm; petioles 4–11 cm. |
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. |
Inflorescences | with 1 terminal head. |
with 1 terminal head. |
Involucres | 8–15 × 15–25 mm. |
12–15 × 15–22 mm. |
Ray florets | deciduous, 10–17, yellow; rays 15–30 × 4–7 mm. |
13–14, yellow; rays 12–20 × 5–8 mm. |
Disc florets | ~6 mm. |
~9 mm. |
Phyllaries | linear-lanceolate to ovate, 13–20 × 3–6 mm, with or without long-acuminate tips, villous-hirsute and ciliate, sometimes glabrous proximally. |
ovate, 10–17 × 5–9 mm; tips acuminate, sericeous. |
Fruits | 6.5 × 1.5 mm, glabrous. |
6–7 × 1.5 mm, glabrous. |
Paleae | 11–12 mm. |
13–14 mm. |
2n | =38. |
|
Balsamorhiza hookeri |
Balsamorhiza sericea |
|
Distribution | ||
Discussion | Dry, open, often rocky areas. Flowering Apr–Jun. 1000–1600 m. BR, BW. CA, ID, NV, WA; southeast to UT. Native. As treated here, B. hookeri consists of the members of section Balsamorhiza that are left over after the entities that are distinct in at least some parts of their ranges are removed. Balsamorhiza hookeri hybridizes with B. hispidula and B. sagittata. The species is named after the British botanist William Jackson Hooker, who initially described it as Heliopsis balsamorhiza and tentatively proposed (but did not validly publish, as he did not accept it) the genus Balsamorhiza under the supposition that it would prove to be distinct from Heliopsis once better material was collected. |
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. |
Source | Flora of Oregon, volume 2, page 200 Abigail (Abby) Moore |
Flora of Oregon, volume 2, page 201 Abigail (Abby) Moore |
Sibling taxa | ||
Synonyms | Balsamorhiza hirsuta, Balsamorhiza hookeri var. hirsuta, Balsamorhiza hookeri var. neglecta, Balsamorhiza hookeri var. platylepis, Balsamorhiza macrolepis, Balsamorhiza macrolepis var. platylepis, Balsamorhiza platylepis | Balsamorhiza macrolepis, Balsamorhiza macrolepis var. platylepis, Balsamorhiza platylepis |
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