OregonFlora: Balsamorhiza deltoidea

	Balsamorhiza deltoidea
	deltoid balsamroot
Stems	forming clumps, 14–54 cm, green, villous-hirsute, with shorter, glandular hairs.
Leaves	simple; margins entire to toothed; teeth rounded and apiculate; surfaces abaxially sparsely hirsute, adaxially sparsely hirsute, villous-hirsute on veins; basal leaves in multiple rosettes; blades deltate, 7.5–27 × 6–16 cm, bases cordate or hastate; petioles 10–27 cm; cauline blades 3–7.5 × 1.1–2.7 cm; petioles 0–8.5 cm.
Inflorescences	with 1 larger; terminal head and 0–2 smaller; axillary heads; peduncles 1–12 cm.
Involucres	terminal 10–15 × 20–33 mm; axillary 8–10 × 11–17 mm.
Ray florets	deciduous, 11–21 on large heads, 6–9 on small heads, yellow; rays 18–35 × 4–17 mm.
Disc florets	5–8 mm.
Phyllaries	ovate, 10–32 × 4–9 mm, villous; more densely so at bases; outer phyllaries often lanceolate; longer than inner.
Fruits	9 × 1.5 mm, glabrous.
Paleae	~7 mm.
2n	=38.

	Balsamorhiza deltoidea
Distribution	[WildflowerSearch map] [BONAP county map]
Discussion	Grasslands, pine or oak woodlands. Flowering Mar–Jul. 50–2200 m. Casc, ECas, Sisk, WV. CA, WA; north to British Columbia. Native. Balsamorhiza deltoidea grows west of the Cascade Range and intergrades with B. careyana in the Cascades and along the Columbia River. (See discussion under B. careyana.) It also hybridizes with B. sericea in Josephine County. Hybrids between Balsamorhiza deltoidea and B. hookeri have been given the name B. × terebinthacea but are not expected to be found in Oregon, given that the ranges of the parental species do not overlap here. The specific epithet refers to the deltoid shape of the leaves.
Source	Flora of Oregon, volume 2, page 199 Abigail (Abby) Moore
Sibling taxa	B. careyana, B. deltoidea x Balsamorhiza sericea, B. hispidula, B. hookeri, B. incana, B. lanata, B. macrophylla, B. rosea, B. sagittata, B. sericea, B. serrata
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Balsamorhiza deltoidea

deltoid balsamroot

Stems

forming clumps, 14–54 cm, green, villous-hirsute, with shorter, glandular hairs.

Leaves

simple;

margins entire to toothed;

teeth rounded and apiculate;

surfaces abaxially sparsely hirsute, adaxially sparsely hirsute, villous-hirsute on veins;

basal leaves in multiple rosettes;

blades deltate, 7.5–27 × 6–16 cm, bases cordate or hastate;

petioles 10–27 cm;

cauline blades 3–7.5 × 1.1–2.7 cm;

petioles 0–8.5 cm.

Inflorescences

with 1 larger; terminal head and 0–2 smaller; axillary heads;

peduncles 1–12 cm.

Involucres

terminal 10–15 × 20–33 mm; axillary 8–10 × 11–17 mm.

Ray florets

deciduous, 11–21 on large heads, 6–9 on small heads, yellow;

rays 18–35 × 4–17 mm.

Disc florets

5–8 mm.

Phyllaries

ovate, 10–32 × 4–9 mm, villous; more densely so at bases; outer phyllaries often lanceolate; longer than inner.

Fruits

9 × 1.5 mm, glabrous.

Paleae

~7 mm.

=38.

Balsamorhiza deltoidea

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

Grasslands, pine or oak woodlands. Flowering Mar–Jul. 50–2200 m. Casc, ECas, Sisk, WV. CA, WA; north to British Columbia. Native.

Balsamorhiza deltoidea grows west of the Cascade Range and intergrades with B. careyana in the Cascades and along the Columbia River. (See discussion under B. careyana.) It also hybridizes with B. sericea in Josephine County. Hybrids between Balsamorhiza deltoidea and B. hookeri have been given the name B. × terebinthacea but are not expected to be found in Oregon, given that the ranges of the parental species do not overlap here. The specific epithet refers to the deltoid shape of the leaves.