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Photo is of parent taxon

fireweed

Stems

30–200 cm, sparsely strigillose, usually glabrous proximally.

Leaves

petioles 2–7 mm;

cauline blades oblong- to elliptic-lanceolate, (6–)9–23 × (0.7–)1.5–3.4 cm, base subcuneate to attenuate, margins ± denticulate, surface strigillose on adaxial side and on abaxial midrib, or, rarely, glabrous.

Inflorescences

strigillose;

bracts 7–25 mm.

Flowers

sepals 9–19 × 1.5–3 mm, acuminate;

petals obovate to suborbicular, 14–25 × 7–14 mm, entire or scarcely emarginate;

filaments 8–17 mm;

anthers 2.5–3 mm;

pollen mixed 3- and 4-porate (rarely 5-porate), 70–95 µm diam.;

ovaries 8–25 mm, style 9–18 mm.

Capsules

5–9.5 cm;

pedicels 1–3 cm.

Seeds

1–1.3 × 0.3–0.4 mm.

2n

= 72, 108.

Chamaenerion angustifolium subsp. circumvagum

Phenology Flowering Jun–Sep.
Habitat Moist, often disturbed places in montane and boreal forest regions, frequent after fires.
Elevation 0–3800 m. (0–12500 ft.)
Distribution
from FNA
AK; AR; AZ; CA; CO; CT; DE; IA; ID; IL; IN; MA; MD; ME; MI; MN; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OR; PA; RI; SD; TN; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; ON; PE; QC; SK; YT; SPM; Mexico (Coahuila, Nuevo León); Eurasia
[BONAP county map]
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Epilobieae > Chamaenerion > Chamaenerion angustifolium
Sibling taxa
C. angustifolium subsp. angustifolium
Synonyms Epilobium angustifolium subsp. circumvagum, C. angustifolium var. abbreviatum, C. angustifolium var. canescens, C. angustifolium subsp. macrophyllum, C. danielsii, C. exaltatum, Chamerion angustifolium var. canescens, C. angustifolium subsp. circumvagum, C. danielsii, C. platyphyllum, E. angustifolium var. abbreviatum, E. angustifolium var. canescens, E. angustifolium subsp. macrophyllum, E. angustifolium var. macrophyllum, E. angustifolium var. platyphyllum, E. danielsii, Pyrogennema angustifolium var. abbreviatum
Name authority (Mosquin) Moldenke: Phytologia 27: 289. (1973)
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