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blue windflower, bog anemone, Oregon anemone, Oregon windflower, western wood anemone, western wood anenome

tenpetal anemone, tenpetal thimbleweed

Aerial shoots

5-30(-35) cm, from rhizomes, rhizomes horizontal.

(10-)30-50 cm, from tubers, rarely also from rhizomes, tubers vertical, rarely ascending.

Basal leaves

0-1, ternate;

petiole 4-20 cm;

terminal leaflet sessile to petiolulate, oblanceolate to rhombic, oblong, or ovate, 1-5(-6) × 0.7-2.5(-3.5) cm, base narrowly cuneate, margins sharply serrate on distal 1/2(-2/3), apex acuminate to acute, surfaces strigose to nearly glabrous;

lateral leaflets unlobed or 1x-lobed; ultimate lobes 0.4-10 mm wide.

(1-)3-6(-9), 1-(nearly 2)-ternate;

petiole 3-20 cm;

terminal leaflet sessile, rarely petiolulate, ovate to obovate, 1-3(-6) × (0.4-)0.7-3(-4) cm, base broadly cuneate, margins crenate to serrate on distal 1/2, rarely on distal 2/3, apex obtuse to broadly acute, surfaces pubescent;

lateral leaflets unlobed or 1x-lobed or -parted; ultimate lobes (6-)8-12 mm wide.

Inflorescences

1-flowered;

peduncle proximally glabrous, distally villous to pilose;

involucral bracts 3, 1-tiered, ternate, ±similar to basal leaves, bases distinct;

terminal leaflet sessile to petiolulate, oblanceolate to rhombic, oblong, or ovate, 1-8 × 0.8-3(-3.5) cm, bases narrowly cuneate to cuneate, margins crenate to serrate on distal 1/2(-2/3), apex acuminate to acute, surfaces abaxially glabrous or strigose, adaxially nearly glabrous to strigose;

lateral leaflets unlobed or 1x-lobed; ultimate lobes 0.5-10 mm wide.

1-flowered;

peduncle villous;

involucral bracts 3, borne above middle of scape at anthesis, 1-tiered, simple, dissimilar to basal leaves, obtriangular, 3-cleft, (1-)1.5-4(-5) cm, bases clasping, ±connate, margins incised throughout, apex narrowly acute to acuminate, surfaces pilose;

segments primarily 3, broadly linear;

lateral segments unlobed or occasionally 1x-lobed; ultimate lobes 1.5-2.5 mm wide.

Flowers

sepals 5-7(-8), blue to purple, reddish, or purple to pink (rarely nearly white or abaxially reddish, violet, or marginally purple, adaxially white), ovate, oblong, or elliptic, 10-20 × 5-8(-10) mm, glabrous;

stamens 30-75.

sepals (7-)10-17(-25), abaxially blue to violet, adaxially white, linear-oblong, rarely narrowly elliptic, (10-)15-20 × 2-3(-4) mm, abaxially hairy, especially toward base, adaxially glabrous or hairy toward base;

stamens 60-70.

Achenes

body oblong to ellipsoid, 4-5 × 1.5-2 mm, not winged, puberulous to pilose, rarely glabrous;

beak ±straight, (0.5-)1-1.5 mm, glabrous.

body elliptic, flat, 2.7-3.5 × 2.2-2.5 mm, not winged, densely white-woolly;

beak subulate, curved, 1-2.3 mm, hidden in achene indument, white tomentose, not plumose.

Heads of achenes

nearly spheric;

pedicel (1.5-)2-5(-7) cm.

cylindric;

pedicel (7-)9-15(-28) cm.

2n

=16.

Anemone oregana

Anemone berlandieri

Phenology Flowering winter–spring (Feb–Apr).
Habitat Open grasslands, prairies, hillsides, often limy substrate, also woods over thin shale
Elevation 60-1100m (200-3600ft)
Distribution
from FNA
CA; OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; FL; KS; LA; MS; NC; OK; SC; TX; VA; n Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Stamens 30–60; abaxial color of sepals same as adaxial color; margins of involucral bracts similar to those of basal leaves.
var. oregana
1. Stamens 60–75; abaxial color of sepals different from adaxial color; margins of involucral bracts more coarsely serrate than those of basal leaves.
var. felix
Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Anemone Ranunculaceae > Anemone
Sibling taxa
A. acutiloba, A. americana, A. berlandieri, A. canadensis, A. caroliniana, A. cylindrica, A. deltoidea, A. drummondii, A. edwardsiana, A. grayi, A. lancifolia, A. lyallii, A. multiceps, A. multifida, A. narcissiflora, A. occidentalis, A. okennonii, A. parviflora, A. patens, A. piperi, A. quinquefolia, A. richardsonii, A. tuberosa, A. virginiana
A. acutiloba, A. americana, A. canadensis, A. caroliniana, A. cylindrica, A. deltoidea, A. drummondii, A. edwardsiana, A. grayi, A. lancifolia, A. lyallii, A. multiceps, A. multifida, A. narcissiflora, A. occidentalis, A. okennonii, A. oregana, A. parviflora, A. patens, A. piperi, A. quinquefolia, A. richardsonii, A. tuberosa, A. virginiana
Subordinate taxa
A. oregana var. felix, A. oregana var. oregana
Synonyms A. heterophylla
Name authority A. Gray: Proc. Amer. Acad. Arts 22: 308. (1887) Pritzel: Linnaea 15: 628. (1841)
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