Fragaria vesca subsp. americana

(Porter) Staudt

Canad. J. Bot. 40: 872. 1962.

Common names: Fraisier américain
EndemicIllustrated
Basionym: Fragaria vesca var. americana Porter Bull. Torrey Bot. Club 17: 15. 1890
Synonyms: F. americana
Treatment appears in FNA Volume 9. Treatment on page 276. Mentioned on page 275.

Leaves green to bright green; terminal leaflet blade ovate or obovate to slightly rhombic, length/width 1.3–1.6, teeth: relative number 0.2–0.6, relative size 1.5–4, terminal tooth longer than adjacent teeth. Flowers bisexual, 12–14.6 mm diam.; hypanthium 11–16.5 mm diam.; petals white, obovate to widely obovate, margins distinct, sometimes distally crenate. Achenes superficial; bractlets and sepals spreading to strongly reflexed; torus carmine, shiny, elongate-conic (often somewhat pointed), easily separating from hypanthium. 2n = 14.


Phenology: Flowering spring.
Habitat: Open forests, forest edges, clearings, along trails and roadsides, open grasslands, often on steep, rocky slopes and outcrops
Elevation: 0–1900 m

Distribution

V9 441-distribution-map.jpg

Alta., B.C., Man., N.B., N.W.T., N.S., Ont., Que., Sask., Conn., Ill., Iowa, Maine, Mass., Mich., Minn., Miss., Nebr., N.H., N.Y., N.C., N.Dak., Ohio, Pa., S.Dak., Vt., Va., W.Va., Wis.

Discussion

It is assumed that after the maximum glaciation, this North American subspecies spread from an eastern refugium northeastward to the Gaspé and northwestward to the Mackenzie and Peace rivers (G. Staudt 1999).

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

yellowish green +  and reddish-brown +
superficial +
ovoid +  and ovate +
1mm +  and 1.5mm +
Günter Staudt† +
(Porter) Staudt +
Fragaria vesca var. americana +
ovate +, shallowly deltate +  and widely ovate or widely depressed +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
thin +  and thick +
spreading +  and strongly reflexed +
free +  and distinct +
Fraisier américain +
Alta. +, B.C. +, Man. +, N.B. +, N.W.T. +, N.S. +, Ont. +, Que. +, Sask. +, Conn. +, Ill. +, Iowa +, Maine +, Mass. +, Mich. +, Minn. +, Miss. +, Nebr. +, N.H. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Pa. +, S.Dak. +, Vt. +, Va. +, W.Va. +  and Wis. +
not +  and aggregated +
0–1900 m +
1.2 cm12 mm <br />0.012 m <br /> (1.46 cm14.6 mm <br />0.0146 m <br />) +
not +  and aggregated +
Open forests, forest edges, clearings, along trails and roadsides, open grasslands, often on steep, rocky slopes and outcrops +
1.1 cm11 mm <br />0.011 m <br /> (1.65 cm16.5 mm <br />0.0165 m <br />) +
crassinucellate +
opposite +  and alternate +
green +  and bright green +
deciduous +
not glaucous +
not leathery +
rhombic +  and roundish +
pinnate +  and entire +
inferior +  and superior +
clustered +, biseriate +  and superposed +
5 (?) +  and 9 (?) +
free +  and distinct +
Flowering spring. +
adnate +, free +, connate +  and distinct +
shallow +
Canad. J. Bot. +
not arillate +
persistent +
free +  and distinct +
spreading +  and strongly reflexed +
lanceolate +
Endemic +  and Illustrated +
free +  and distinct +
1 +  and 10 +
palmate +  and pinnate +
deciduous +
distinct +
not elongate +
F. americana +
Fragaria vesca subsp. americana +
Fragaria vesca +
subspecies +
1.5 +  and 4 +
adjacent +
2.4 cm24 mm <br />0.024 m <br /> (3.7 cm37 mm <br />0.037 m <br />) +
inconspicuous +
elongate-conic +
enlarged +
0.9 cm9 mm <br />0.009 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
stoloniferous +, short-rhizomatous +  and acaulescent +