Spoon-leaf Moonwort - Botrychium spathulatum
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One of the rarest moonwort species in Montana, currently reported from 2 sites in northwest Montana. Population levels at these sites are undocumented.
Spoon-leaf Moonwort produces a single erect frond, up to 12 cm high, that is divided into a trophophore and a sporophore. The trophophore has a stalk, less than 1 mm long, and a narrowly triangular blade that is pinnately divided into 2-8 pairs of spoon-shaped, widely spaced, entire to lobed pinnae. The sporophore is 1-2 times the length of the trophophore and 1-2 times pinnately divided into linear segments that bear the spores.
Leaves appearing in late spring-early summer.
Botrychium subgenus Botrychium is a large group of very similar species in our area, many of which are newly described. A technical manual should be consulted for positive identification. This species is similar to B. minganense, B. ascendens, and B. crenulatum, but the latter three have oval to fan-shaped pinnae. Botrychium lunaria is also similar but has pinnae that are closely adjacent.
In MT in Glacier and Lake counties; in western North America from AK tand NT south through BC and AB to northwestern MT, in eastern North America WI and MI east through ON, QC and NB (Donald Farrar, Iowa State University, unpublished ms.).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Meadows and open forests, often in areas of moderate disturbance or sparsely vegetated soil in the valley and montane zones.
- Additional ReferencesLegend: View Online Publication
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- Farrar, Donald. 2011. Moonwort (Botrychium) Systematics. Ada Hayden Herbarium. Iowa State University.
- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- Mantas, M. and R.S. Wirt. 1995. Moonworts of western Montana (Botrychium subgenus Botrychium). Flathead National Forest. 103 pp.
- Wagner, W. H. and F. S. Wagner. 1993. Ophioglossaceae. In: Flora of North America Editorial Committee, eds. 1993. Flora of North America North of Mexico. 3+ vols. New York and Oxford. Vol. 2, pp. 85-106.
- Wagner, W. H., Jr. and F. S. Wagner. 1990. Notes on the fan-leaflet group of moonworts in North America with descriptions of two new members. American Fern Journal 80:73-81.