Botrychium hesperium |
Botrychium pinnatum |
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western moonwort |
northern moonwort, northwestern moonwort, St. John |
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Pinnae | to 6 pairs, ascending, usually approximate or overlapping except in shade forms, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair commonly much larger and more divided than adjacent pair, lobed to tip, basal pair oblong to oblong-lanceolate with lobed margins, remainder broadly spatulate with entire margins or 1 or more shallow lobes, apex rounded, venation pinnate. |
to 7 pairs, only slightly ascending, approximate to overlapping, 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 adjacent pair, obliquely ovate to lanceolate-oblong, to spatulate, deeply and regularly lobed or pinnulate, lobed to tip, margins entire to very shallowly crenate, apex truncate to somewhat acute, venation pinnate. |
Trophophore | stalk 0–3(–10) mm, to 1/4 length of trophophore rachis; blade ± gray-green, dull, oblong-linear to deltate, 1–2-pinnate, to 6 × 5 cm, firm. |
stalk 0–2 mm, 0 to 0.1 times length of trophophore rachis; blade bright shiny green, oblong-deltate, 1–2-pinnate, to 8 × 5 cm, papery. |
Sporophores | 1–3 pinnate, 2–3 times length of trophophore. |
2-pinnate, 1–2 times length of trophophore. |
2n | =180. |
=180. |
Botrychium hesperium |
Botrychium pinnatum |
|
Phenology | Leaves appearing in midspring, dying in early fall. | Leaves appearing in June to August. |
Habitat | Grassy mountain slopes, snow fields, road ditches with willows, and sand dunes | Grassy slopes, streambanks, woods |
Elevation | 200–2800 m (700–9200 ft) | 0–2500 m (0–8200 ft) |
Distribution |
AZ; CO; ID; MI; MT; UT; WY; AB; BC; ON; SK
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AK; CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; NT; YT
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Discussion | In the Rocky Mountains Botrychium hesperium grows often with B. echo, and in the Lake Superior region, with B. acuminatum and B. matricariifolium. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Botrychium pinnatum is most commonly associated with B. lanceolatum and B. lunaria. Specimens of B. pinnatum have been misidentified as Botrychium boreale. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 2. | FNA vol. 2. |
Parent taxa | Ophioglossaceae > Botrychium > subg. Botrychium | Ophioglossaceae > Botrychium > subg. Botrychium |
Sibling taxa | ||
Synonyms | B. matricariifolium subsp. hesperium | B. boreale subsp. obtusilobum |
Name authority | (Maxon & R. T. Clausen) W. H. Wagner & Lellinger: Amer. Fern J. 71: 92. (1981) | H. St. John: Amer. Fern J. 19: 11. (1929) |
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