Geum vernum

(Rafinesque) Torrey & A. Gray

Fl. N. Amer. 1: 422. 1840.

Common names: Spring avens
EndemicIllustrated
Basionym: Stylypus vernus Rafinesque Neogenyton, 3. 1825
Treatment appears in FNA Volume 9. Treatment on page 70. Mentioned on page 61.

Plants leafy-stemmed. Stems 20–70 cm, pilose or sparsely pilose, hairs septate. Leaves: basal 4–27 cm, blade simple or pinnate, leaflets 3–11, terminal leaflet larger; cauline 2–7 cm, stipules ± free, 8–25 × 7–12 mm, blade pinnate to 3-foliolate. Inflorescences 3–13-flowered. Pedicels glandular-downy, becoming glabrate in fruit. Flowers erect; epicalyx bractlets absent; hypanthium green; sepals reflexed, 1–3 mm; petals spreading, yellow to cream, oblong to elliptic, sometimes obovate, 1–2 mm, equal to or shorter than sepals, apex rounded. Fruiting tori on 3–7 mm stipes, glabrous. Fruiting styles geniculate-jointed, proximal segment persistent, 1.5–3 mm, apex hooked, nearly glabrous except for few septate-glandular hairs, distal segment deciduous, 0.7–1 mm, nearly glabrous except for short hairs. 2n = 42.


Phenology: Flowering spring.
Habitat: Moist woods, disturbed moist areas, flood plains, openings
Elevation: 0–600 m

Distribution

V9 103-distribution-map.jpg

Ont., Ark., Del., D.C., Ga., Ill., Ind., Iowa, Kans., Ky., Md., Mass., Mich., Mo., Nebr., N.J., N.Y., N.C., Ohio, Okla., Pa., Tenn., Va., W.Va., Wis.

Discussion

Geum vernum is distinctive and is recognized by its early flowering, minute petals, lack of epicalyx bractlets, and heads of achenes soon elevated well beyond the recurved hypanthia and sepals. Recently, it has been expanding its range northward and has been collected with increasing frequency in southern Ontario, Massachusetts, Michigan, New York, and Wisconsin. No specimens could be located to confirm reports of G. vernum from Mississippi or Texas.

Selected References

None.

Lower Taxa

None.
... more about "Geum vernum"
Joseph R. Rohrer +
(Rafinesque) Torrey & A. Gray +
compound +  and simple +
opposite +  and alternate +
4 cm40 mm <br />0.04 m <br /> (27 cm270 mm <br />0.27 m <br />) +
Stylypus vernus +
pinnate +  and 3-foliolate +
orbiculate +, ovate +, elliptic +, obovate +  and oblanceolate +
free +  and distinct +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Spring avens +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Ont. +, Ark. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Md. +, Mass. +, Mich. +, Mo. +, Nebr. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, Tenn. +, Va. +, W.Va. +  and Wis. +
not +  and aggregated +
0–600 m +
0.4 cm4 mm <br />0.004 m <br /> (4.6 cm46 mm <br />0.046 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
tapered +, ovoid +  and fusiform +
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Moist woods, disturbed moist areas, flood plains, openings +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
odd-pinnate +, lyrate-pinnate +, 3-foliolate +  and simple +
opposite +  and alternate +
winter-persistent +
cauline +  and basal +
cordate +, reniform +, orbiculate +, oblanceolate +, obovate +, oblong +, elliptic +  and rhombic +
palmate +  and pinnate +
crenate +, dentate +, laciniate +, 2-7-lobed +, flat +, lobed +, toothed +  and entire +
inferior +  and superior +
clustered +, biseriate +  and superposed +
glabrate +  and glandular-downy +
purple-veined +
0 (?) +  and 4 (?) +
free +  and distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering spring. +
adnate +, free +, connate +  and distinct +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Fl. N. Amer. +
not arillate +
persistent +
free +  and distinct +
deltate-lanceolate +, deltate-ovate +  and deltate +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Endemic +  and Illustrated +
free +  and distinct +
1 +  and 5 +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
palmate +  and pinnate +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
geniculate-jointed +  and entire +
persistent +
distinct +
elongating +
basal +, lateral +, subterminal +  and terminal +
hairy +  and glabrous +
not hooked +  and hooked +
accrescent +
10 cm100 mm <br />0.1 m <br /> (?) +
Acomastylis +, Erythrocoma +, Novosieversia +  and Stylypus +
Geum vernum +
species +
inconspicuous +
hemispheric +  and cylindric +
enlarged +
geniculate-jointed +
hairy +  and glabrous +