Balsamorhiza macrophylla |
Balsamorhiza serrata |
|
---|---|---|
cutleaf balsamroot, Idaho balsamroot, large-leaf balsamroot |
serrate balsam root, serrated balsamroot, serrrate balsamroot, tooth balsamroot |
|
Habit | Plants 30–45(–100) cm. | Plants 10–20(–30) cm. |
Basal leaves | green, ovate to lanceolate, 20–50+ × 8–15 cm (pinnatifid, lobes lanceolate, 20–80+ × 10–40 mm, entire or ± dentate), bases ± cuneate, ultimate margins usually entire (plane or weakly revolute, ciliate), apices obtuse to acute, faces scabrous or piloso-hirtellous to pilose (at least abaxial usually gland-dotted as well). |
blades pale green to gray-green, lanceolate or lance-ovate, 5–15(–20+) × 2–5(–10) cm (earliest sometimes, later seldom, pinnately lobed, mostly toward tips), bases usually cuneate to subtruncate, sometimes cordate, margins usually dentate to serrate, apices acute, faces hirsutulous to scabrous. |
Involucres | ± hemispheric, 20–30 mm diam. |
campanulate, 15–25 mm diam. |
Ray laminae | 35–50+ mm. |
(20–)30–40. |
Outer phyllaries | lance-ovate or lanceolate to lance-linear, 12–30(–40) mm, equaling or surpassing inner (margins ciliate), apices acute to attenuate. |
lanceolate to lance-triangular, 10–22 mm, shorter than inner, apices acute to attenuate (margins ciliate). |
Heads | usually borne singly. |
usually borne singly. |
2n | = 100 ± 2. |
= 38. |
Balsamorhiza macrophylla |
Balsamorhiza serrata |
|
Phenology | Flowering May–Jul. | Flowering Apr–Jun. |
Habitat | Deep soils, rocky meadows, sagebrush scrublands, conifer forests | Basaltic scablands, sagebrush scrub, openings in forests, meadow borders |
Elevation | 1000–2400 m (3300–7900 ft) | (1000–)1400–1500 m ((3300–)4600–4900 ft) |
Distribution |
ID; UT; WY
|
CA; NV; OR; WA
|
Discussion | Balsamorhiza macrophylla is a high polyploid; it occurs sympatrically with B. sagittata. It evidently arose from hybridization between B. sagittata and B. hispidula. Balsamorhiza macrophylla has the multi-branched caudices and massive taproots of the former, and the leaf dissection of the latter. No hybrids with other species are known. Presumably, the high-polyploid chromosome complement precludes interbreeding. Plants of var. idahoensis are smaller, are known only from southwestern Idaho and northeastern Utah, and differ from var. macrophylla by being pilose, with strongly shaggy-pilose involucres. More study may determine that var. idahoensis merits specific rank. The Utah populations are not well understood and deserve attention. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Balsamorhiza serrata hybridizes with B. careyana. Leaves of the hybrids tend to be prostrate rather than erect. Most of the hybrids display the larger size of B. careyana and lack the pubescence of the heads; serrata-like plants never develop more than a single head nor do they have the pubescence of the cypselae. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 98. | FNA vol. 21, p. 96. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Ecliptinae > Balsamorhiza > subg. Balsamorhiza | Asteraceae > tribe Heliantheae > subtribe Ecliptinae > Balsamorhiza > subg. Balsamorhiza |
Sibling taxa | ||
Synonyms | B. hookeri var. idahoensis, B. macrophylla var. idahoensis | |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 350. (1840) | A. Nelson & J. F. Macbride: Bot. Gaz. 56: 479. (1913) |
Web links |