Isoetaceae
Quillwort Family
1 genera
8 species
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Isoetes bolanderiBolander's quillwort
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Shallow water of mountain pools, montane to subalpine.
Origin: Native
Growth Duration: Perennial
Isoetes howelliiHowell's quillwort
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California, east to Montana and Utah.
Habitat: In and around temporary lakes and pools, generally in lowlands and foothills.
Origin: Native
Growth Duration: Perennial
Isoetes maritimamaritime quillwort
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Washington, east to southwestern Alberta; circumboreal.
Habitat: Aquatic, sometimes in tidal habitats, lowland to middle elevations in the mountains.
Origin: Native
Growth Duration: Perennial
Isoetes minimasmall quillwort
Distribution: Currently known only east of the Cascades crest in Washington; south-central British Columbia to northeastern Washington and west-central Idaho.
Habitat: Seasonally moist swales and vernal pools at middle elevations among open conifer forest or sagebrush-steppe.
Origin: Native
Spores: June
Growth Duration: Perennial
Isoetes nuttalliiNuttall's quillwort
Distribution: Occurring on both sides of the Cascades crest in Washington; southwestern British Columbia to southern California,
Habitat: Terrestrial; wet prairies, balds, and open wet ground in the lowlands.
Origin: Native
Growth Duration: Perennial
Isoetes occidentaliswestern quillwort
Distribution: Occurring chiefly west of the Cascades crest; Alaska to California, east to the Rocky Mountains.
Habitat: Submerged in ponds and lakes, often in deep water, from the lowland to middle elevations in the mountains.
Origin: Native
Growth Duration: Perennial
Isoetes tenellabristle-like quillwort, spiny spored quillwort
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, also eastward to the Great Lakes region and northeastern North America; circumboreal.
Habitat: In shallow water or along shorelines of ponds and lakes, from the lowlands to middle elevations in the mountains.
Origin: Native
Growth Duration: Perennial
Isoetes ×truncata
Origin: Native