Botrychium hesperium |
Botrychium ascendens |
|
---|---|---|
western moonwort |
trianglelobe moonwort, upswept moonwort |
|
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 5 pairs, strongly ascending, well separated, 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 narrowly cuneate, undivided to tip, margins sharply denticulate and often shallowly incised, apex rounded, venation like ribs of fan, midrib absent. |
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 3–10 mm, 1/6 length of trophophore rachis; blade yellow-green, oblong to oblong-lanceolate, 1-pinnate, to 6 × 1.5 cm, thin but firm. |
Sporophores | 1–3 pinnate, 2–3 times length of trophophore. |
2-pinnate at base of sporangial cluster, 1.3–2 times length of trophophore. |
2n | =180. |
=180. |
Botrychium hesperium |
Botrychium ascendens |
|
Phenology | Leaves appearing in midspring, dying in early fall. | Leaves appearing in late spring to midsummer. |
Habitat | Grassy mountain slopes, snow fields, road ditches with willows, and sand dunes | In grassy fields, widely scattered |
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
|
AK; CA; MT; NV; OR; WY; BC; ON; YT
|
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 ascendens is a distinctive little moonwort that grows with B. crenulatum, B. lunaria, and B. minganense. This species and B. pedunculosum are the only grapeferns that often have extra sporangia on the proximal pinnae. (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 | |
Name authority | (Maxon & R. T. Clausen) W. H. Wagner & Lellinger: Amer. Fern J. 71: 92. (1981) | W. H. Wagner: Amer. Fern J. 76: 36, figs. 1, 2. (1986) |
Web links |
|