Botrychium virginianum
Botrychium biternatum
botryche de virginie, common grapefern, rattlesnake fern
southern grapefern, sparse-lobed grapefern, sparselobe grapefern
to 12 pairs, usually approximate to overlapping, slightly ascending, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, lanceolate, divided to tip.
to 7 pairs, usually remote, horizontal, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, undivided except in proximal 2/3–1/2.
sessile;
blade pale green, 3–4-pinnate, to 25 × 33 cm, thin, herbaceous.
stalk 4–20 cm, 2–2.5 times length of trophophore rachis;
blade green to dark green, plane, 2–3-pinnate, to 18 × 28 cm, herbaceous.
lanceolate and deeply lobed, lobes linear, serrate, apex pointed, venation pinnate, midrib present.
elongate, obliquely lanceolate to narrowly lanceolate, margins nearly parallel and finely denticulate, apex short-acuminate, venation pinnate.
2-pinnate, 0.5–1.5(–2) times length of trophophore.
1–2-pinnate, 2–3 times length of trophophore.
=184.
=90.
Botrychium virginianum
Botrychium biternatum
Botrychium virginianum is the most widespread Botrychium in North America.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Botrychium biternatum often grows with B. dissectum and B. jenmanii. The name B. biternatum was misapplied by L.Underwood to B. lunarioides (W.H. Wagner Jr. 1961).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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