Flora of North America species comparison

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Botrychium oneidense

blunt-lobe grape-fern, blunt-lobed grapefern, botryche d'oneida, botryche du lac onéida
Pinnae

to 5 pairs, usually remote, horizontal to ascending, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, undivided except in proximal 2/3–3/4.
Trophophore

stalk 2–15 cm, 1.5–2.5 times length of blade rachis;

blade dull bluish green, ± plane, 2–3-pinnate, to 15 × 20 cm, ± leathery.
Pinnules

obliquely ovate, margins finely crenulate to denticulate, apex rounded to acute, venation pinnate.
Sporophores

2–3-pinnate, 1.5–2.5 times length of trophophore.
2n

=90.

Botrychium oneidense
Phenology Leaves green over winter, sporophores seasonal, new leaves appearing in spring.
Habitat In moist, shady, acidic woods and swamps
Elevation 0–1200 m (0–3900 ft)
Distribution
from FNA
CT; DC; DE; IN; KY; MA; MD; ME; MI; MN; NC; NH; NJ; NY; OH; PA; RI; VA; VT; WI; WV; NB; ON; QC
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Discussion

Botrychium oneidense commonly occurs with B. dissectum and B. multifidum. Young individuals of both may resemble B. oneidense (W.H. Wagner Jr. 1961b).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 2.
Parent taxa Ophioglossaceae > Botrychium > subg. Sceptridium > sect. Sceptridium
Sibling taxa
B. acuminatum, B. ascendens, B. biternatum, B. boreale, B. campestre, B. crenulatum, B. dissectum, B. echo, B. gallicomontanum, B. hesperium, B. jenmanii, B. lanceolatum, B. lunaria, B. lunarioides, B. matricariifolium, B. minganense, B. montanum, B. mormo, B. multifidum, B. pallidum, B. paradoxum, B. pedunculosum, B. pinnatum, B. pseudopinnatum, B. pumicola, B. rugulosum, B. simplex, B. spathulatum, B. virginianum
Synonyms B. ternatum var. oneidense, B. dissectum var. oneidense, B. multifidum var. oneidense
Name authority (Gilbert) House: Amer. Midl. Naturalist 7: 126. (1905)
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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