Balsamorhiza rosea |
Balsamorhiza hookeri |
|
---|---|---|
rosy balsamroot |
hairy balsamroot, hare's head balsamroot, Hooker's balsam root |
|
Habit | Plants 6–10(–30) cm. | Plants 10–30 cm. |
Basal leaves | blades gray-green, oblong to lance-ovate, 3–10(–20) × 2–5 cm (rarely pinnately lobed), bases weakly cordate or truncate, margins crenate to serrate, apices rounded to acute, faces finely strigose to moderately scabrous (usually gland-dotted as well). |
blades usually gray-green, narrowly to broadly lanceolate or ovate, (8–)20–30(–40) × 2–15 cm (1–2-pinnatifid, primary lobes oblong or lanceolate to linear, 5–100 × 0.5–15 mm, secondary lobes usually ± linear, spreading), bases ± truncate to broadly cuneate, ultimate margins usually entire (plane or revolute, ciliate or not), apices obtuse to acute, faces hirsute, sericeous, or strigose (and gland-dotted or finely stipitate-glandular). |
Involucres | hemispheric, 18–20 mm diam. |
campanulate to hemispheric, 15–30 mm diam. |
Ray laminae | (becoming brick-red, often drying to pink or rose, and chartaceous) (8–)15(–25) mm (hispidulous abaxially; cypselae strigose). |
15–30(–45) mm. |
Outer phyllaries | deltate or ovate to lanceolate, 8–12 mm, not surpassing inner. |
ovate-lanceolate to lanceolate, 10–24+ mm, seldom surpassing inner, apices acuminate to attenuate (margins usually ciliate). |
Heads | usually borne singly. |
borne singly. |
2n | = 38. |
= 38. |
Balsamorhiza rosea |
Balsamorhiza hookeri |
|
Phenology | Flowering Apr–May. | Flowering Apr–May(–Jul). |
Habitat | Dry hills | Rocky outcrops, dry meadows, sagebrush scrublands, basalt scablands (north), dry, open forests (south) |
Elevation | 300–400 m [1000–1300 ft] | (300–)1000–1500(–2900) m [(1000–)3300–4900(–9500) ft] |
Distribution |
OR; WA
|
CA; NV; OR; WA
|
Discussion | In a hybrid swarm involving Balsamorhiza rosea and B. careyana, B. rosea remains relatively uncontaminated; the dominance among the hybrids appears to lie with B. careyana. A record of a hybrid between B. rosea and B. careyana from the Spokane area is doubtful. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
At one time or another, most species of subg. Balsamorhiza have been synonymized under B. hookeri. Nevertheless, a number of taxa are justifiably segregated as species by their morphologic differences and geographic restrictions. One might logically choose either of two taxonomies: recognizing only two species in the entire genus, one representing subg. Artorhiza and the other subg. Balsamorhiza, or recognizing each slightly differing population as a species. Either course results in an unsatisfactory classification. The present classification is a compromise. A knotty problem persists. A central cluster of populations from eastern Washington to southeastern California display a number of minor and locally discrete morphologies. They tend to be less isolated from each other than are the peripheral populations, although some tend to mimic the latter ones in one or more characteristics. Their evolutionary history may be involved with past hybridizations with each other or with species of subg. Artorhiza, gene drift, and polyploidy. At present, it appears impossible to reach a satisfactory classification. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 96. | FNA vol. 21, p. 98. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | B. hookeri var. rosea | Heliopsis balsamorhiza, B. hirsuta, B. hirsuta var. lagocephala, B. hirsuta var. neglecta, B. hookeri var. hirsuta, B. hookeri var. lagocephala, B. hookeri var. neglecta, B. macrolepis var. platylepis, B. platylepis |
Name authority | A. Nelson & J. F. Macbride: Bot. Gaz. 56: 478. (1913) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 349. (1840) |
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