Balsamorhiza sericea |
Balsamorhiza hispidula |
|
---|---|---|
silky balsamroot, silvery balsamroot |
hispid balsamroot |
|
Stems | 6–38 cm, sericeous; from single taproot. |
8–25 cm, villous-hirsute; from single taproot. |
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. |
ovate-lanceolate, 1-pinnately divided with pinnae again lobed, often with only a few lobes at tips or divided; margins entire, ciliate; surfaces hispid; basal leaves in 1–few rosettes; blades 5–18 × 3–7.5 cm; pinnae 2–8 mm wide; petioles 2–9 cm; cauline leaves in one opposite pair; blades 1.5–5 × 0.4–2 cm; petioles 1.5–4 cm. |
Inflorescences | with 1 terminal head. |
with 1 terminal head. |
Involucres | 12–15 × 15–22 mm. |
10–15 × 17–22 mm. |
Ray florets | 13–14, yellow; rays 12–20 × 5–8 mm. |
deciduous, 10–13, yellow; rays 20–25 × 5–10 mm. |
Disc florets | ~9 mm. |
6–7 mm. |
Phyllaries | ovate, 10–17 × 5–9 mm; tips acuminate, sericeous. |
linear to lanceolate, 14–17 × 2–3 mm, with acuminate or caudate tips, ciliate, villous-hirsute. |
Fruits | 6–7 × 1.5 mm, glabrous. |
6–7 mm, glabrous. |
Paleae | 13–14 mm. |
7–8 mm. |
Balsamorhiza sericea |
Balsamorhiza hispidula |
|
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. |
Dry, often rocky, open areas. Flowering Apr–Jun. 800–1700 m. BR, BW, Owy. ID, NV; northeast to MT, east top WY, southeast to AZ. Native. While B. hispidula is quite distinct from B. hookeri throughout most of its range, it intergrades completely with B. hookeri in Oregon. Although the two species have been kept separate in this treatment, most Oregon specimens of B. hispidula show some evidence of gene flow from B. hookeri. Balsamorhiza hispidula also hybridizes with B. sagittata. The specific epithet refers to the pubescence of the plants. |
Source | Flora of Oregon, volume 2, page 201 Abigail (Abby) Moore |
Flora of Oregon, volume 2, page 200 Abigail (Abby) Moore |
Sibling taxa | ||
Synonyms | Balsamorhiza macrolepis, Balsamorhiza macrolepis var. platylepis, Balsamorhiza platylepis | Balsamorhiza hookeri var. hispidula |
Web links |