Niphotrichum canescens subsp. canescens
Plants mostly large. Leaves broadly ovate-lanceolate to ovate, often distinctly curved throughout the shoots, very broadly canaliculate distally, hyaline in the uppermost part and merging with the awn, making it very broad; awns not or weakly decurrent, distinctly denticulate and spinulose towards the apex.
Habitat: Sandy or gravelly soils and fine rock-debris, acidic or calcareous substrates in rather dry situations, soil or humus over rock ledges along roadsides, gritty soil at lake shores, grassland and heaths, exposed boulders along streams and creeks and on dunes
Elevation: low to high elevations (0-4200 m)
Distribution
Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., Ont., Que., Sask., Yukon, Alaska, Colo., Idaho, Maine, Mich., Mont., N.H., N.Y., Oreg., Utah, Vt., Wash., Wyo., Europe, Asia (Siberia).
Discussion
Subspecies canescens occurs across the continent from British Columbia, Washington, and Oregon to Newfoundland, with the southernmost extensions to the Rocky Mountains of Colorado and the northernmost station at Lake Iliamna in southern Alaska. It is highly variable; doubtless the differing phenotypes are reactions to varying environmental conditions. The most common phenotype comprises robust plants with broad and typically concave leaves that are falcate along the whole stem and are long-pilose with awns that merge with large hyaline apical parts of the leaves. The opposite extreme is plants with thin shoots and almost elliptical, non-falcate, spoon-shaped, and cucullate leaves that have a short and strait awn or are muticous.
Selected References
None.