Balsamorhiza macrophylla

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 350. 1840.

Endemic
Synonyms: Balsamorhiza hookeri var. idahoensis (W. M. Sharp) Cronquist Balsamorhiza macrophylla var. idahoensis W. M. Sharp
Treatment appears in FNA Volume 21. Treatment on page 98. Mentioned on page 94, 95.

Plants 30–45 (–100) 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 glanddotted as well). Heads usually borne singly. Involucres ± hemispheric, 20–30 mm diam. Outer phyllaries lanceovate or lanceolate to lance-linear, 12–30 (–40) mm, equaling or surpassing inner (margins ciliate), apices acute to attenuate. Ray laminae 35–50+ mm. 2n = 100 ± 2.


Phenology: Flowering May–Jul.
Habitat: Deep soils, rocky meadows, sagebrush scrublands, conifer forests
Elevation: 1000–2400 m

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.

Lower Taxa

None.

"broader" is not a number.

... more about "Balsamorhiza macrophylla"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
less corymbiform +  and racemiform +
indeterminate +  and determinate +
William A. Weber +
Nuttall +
bristlelike +
coroniform +
not corrugated +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
cuneate +
compound +  and simple +
cordate;lobed;1-2-pinnatifid;ovate;oblong;ovate;oblong;linear-oblong;lanceovate;lance-elliptic;lanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
yellow +  and orange +
hairy +  and glabrous +
3-4-angled +  and prismatic +
fertile +  and bisexual +
fertile +  and bisexual +
Idaho +, Utah +  and Wyo. +
1000–2400 m +
piloso-hirtellous +  and pilose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Deep soils, rocky meadows, sagebrush scrublands, conifer forests +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
hemispheric +
alternate +  and opposite +
deltate +
entire +, serrate +  and dentate +
crenate +  and entire +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
lanceolate +  and lance-linear +
1.2 cm12 mm <br />0.012 m <br /> (3 cm30 mm <br />0.03 m <br />) +
surpassing inner phyllaries +  and equaling +
2-carpellate +
persistent +
Flowering May–Jul. +
8 +  and 20 +
unequal +  and subequal +
Trans. Amer. Philos. Soc., n. s. +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
helton1972a +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Balsamorhiza hookeri var. idahoensis +  and Balsamorhiza macrophylla var. idahoensis +
Balsamorhiza macrophylla +
Balsamorhiza subg. Balsamorhiza +
species +
cylindric +
cylindric +
shorter to longer than campanulate +
45 cm450 mm <br />0.45 m <br /> (100 cm1,000 mm <br />1 m <br />) +
10 cm100 mm <br />0.1 m <br /> (45 cm450 mm <br />0.45 m <br />) +