Botrychium hesperium

(Maxon & R. T. Clausen) W. H. Wagner & Lellinger

Amer. Fern J. 71: 92. 1981.

Common names: Western moonwort
Endemic
Basionym: Botrychium matricariifolium subsp. hesperium Maxon & R.T. Clausen Mem. Torrey Bot. Club 19(2): 88, fig. 15. 1938
Treatment appears in FNA Volume 2.

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. 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. Sporophores 1–3 pinnate, 2–3 times length of trophophore. 2n =180.


Phenology: Leaves appearing in midspring, dying in early fall.
Habitat: Grassy mountain slopes, snow fields, road ditches with willows, and sand dunes
Elevation: 200–2800 m

Distribution

V2 687-distribution-map.gif

Alta., B.C., Ont., Sask., Ariz., Colo., Idaho, Mich., Mont., Utah, Wyo.

Discussion

In the Rocky Mountains Botrychium hesperium grows often with B. echo, and in the Lake Superior region, with B. acuminatum and B. matricariifolium.

Selected References

None.

Lower Taxa

None.
... more about "Botrychium hesperium"
rounded +
Warren H. Wagner Jr. +  and Florence S. Wagner +
(Maxon & R. T. Clausen) W. H. Wagner & Lellinger +
than adjacent pair +
Botrychium matricariifolium subsp. hesperium +
simple +  and 5-pinnate +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
oblong-linear +  and deltate +
0 cm0 mm <br />0 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Western moonwort +
Alta. +, B.C. +, Ont. +, Sask. +, Ariz. +, Colo. +, Idaho +, Mich. +, Mont. +, Utah +  and Wyo. +
200–2800 m +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Grassy mountain slopes, snow fields, road ditches with willows, and sand dunes +
of widely scattered , long , uniseriate hairs +
Leaves appearing in midspring, dying in early fall. +
epiphytic +  and terrestrial +
spore-bearing +  and laminate +
photosynthetic +
with long , uniseriate hairs +  and glabrous +
Amer. Fern J. +
flattened +
not fleshy +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
with corky ridges +  and smooth +
list +  and count +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
not proliferous +
sessile +  and short-stalked +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
thick-walled +  and trilete +
2-3 times length of trophophore +
flattened +
not fleshy +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
unbranched +  and simple +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
tuberculate +  and rugate +
Botrychium hesperium +
Botrychium subg. Botrychium +
species +
sessile +  and short-stalked +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0 length of trophophore rachis +  and 1/4 length of trophophore rachis +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
anastomosing +
pinnate +  and fan +