Flora of North America species comparison

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Chamaenerion angustifolium subsp. angustifolium
Photo is of parent taxon
Stems

20–130 cm, subglabrous.
Leaves

subsessile;

cauline blades linear-lanceolate to narrowly lanceolate, (3–)7–14(–18.5) × (0.3–)0.7–1.3(–2.5) cm, base rounded to cuneate, margins usually entire, rarely low-denticulate, surfaces and veins glabrous.
Inflorescences

subglabrous;

bracts 5–20 mm.
Flowers

sepals 6–15 × 1.5–2.5 mm, acute or acuminate;

petals obovate to narrowly obovate, 9–15(–19) × 3–9(–11) mm, entire or scarcely emarginate;

filaments 7–14 mm;

anthers 2–2.5 mm;

pollen 3-porate (rarely 4-porate), 60–75 µm diam.;

ovaries 6–20 mm, style 8–14 mm.
Capsules

4–8 cm;

pedicels 0.5–2 cm.
Seeds

0.9–1 × 0.3–0.4 mm.
2n

= 36.

Chamaenerion angustifolium subsp. angustifolium
Phenology Flowering Jun–Sep.
Habitat Moist, often disturbed, places in mountains or in lower areas, frequent especially after fires.
Elevation 0–3800 m. (0–12500 ft.)
Distribution
from FNA
AK; ID; MN; MT; PA; UT; WA; WY; AB; BC; MB; NL; NS; NT; NU; ON; QC; SK; YT; Greenland; Eurasia
[BONAP county map]
Discussion

Plants with white corollas, only a minor variant, sometimes occur. Because of reduced competition in Arctic regions after fires, large populations of subsp. angustifolium may persist for many years.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Epilobieae > Chamaenerion > Chamaenerion angustifolium
Sibling taxa
C. angustifolium subsp. circumvagum
Synonyms C. angustifolium var. spectabile, C. spicatum, Epilobium angustifolium var. albiflorum, E. angustifolium var. album, E. angustifolium var. pygmaeum, E. spicatum, E. spicatum var. leucanthum
Name authority unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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