Flora of North America species comparison

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Botrychium oneidense

Botrychium acuminatum

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

point moonwort, tail grapefern
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.

to 6 pairs, spreading to ascending, mostly separated by pinna width, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to next adjacent pair, narrowly oblanceolate to linear-lanceolate, simple to irregularly divided to tip, margins commonly ± entire and with 1–several shallow and irregular lobes, apex acuminate, venation pinnate.
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.

stalk 0–20 mm, 0.1–0.5 times length of trophophore rachis;

blade dull, glaucescent, ovate-oblong, 1-pinnate, to 6 × 5 cm, firm.
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.

1–2-pinnate, 1.4–2 times length of trophophore.
2n

=90.

=180.

Botrychium oneidense

Botrychium acuminatum
Phenology Leaves green over winter, sporophores seasonal, new leaves appearing in spring. Leaves appearing in midspring, dying in fall.
Habitat In moist, shady, acidic woods and swamps Lake Superior region in sand dunes in shade, old fields, grassy railroad sidings, and roadside ditches
Elevation 0–1200 m (0–3900 ft) 200–500 m (700–1600 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
[WildflowerSearch map]
from FNA
MI; ON
[BONAP county map]
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.)

Botrychium acuminatum grows with various other moonworts, particularly its nearest relatives, B. hesperium and B. matricariifolium.

Of conservation concern.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 2. FNA vol. 2.
Parent taxa Ophioglossaceae > Botrychium > subg. Sceptridium > sect. Sceptridium Ophioglossaceae > Botrychium > subg. Botrychium
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
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. oneidense, 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) W. H. Wagner: Contr. Univ. Michigan Herb. 17: 321. (1990)
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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