E-Flora BC: Electronic Atlas of the Flora of British Columbia

Isoetes howellii Engelm.
Howell's quillwort
Isoetaceae (Quillwort family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #11050)

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Distribution of Isoetes howellii
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Midget quillwort is found in North America only in Washington State and British Columbia ({ah}//plants.usda.gov/java/profile?symbol=ISMI4USDA 2010{/a}). In British Columbia, it is reported from Castlegar and Salmo, where it was collected by Adolf Ceska. Ceska and Ceska (2001) provide the following information for this species: “Isoetes minima differs from I. howellii by having small, spiny megaspores and by sporangia that completely lack velum. Megaspores of Isoetes howellii have low ridges and its sporangia have partial velum.....Isoetes minima was described from a single collection made by Wilhelm Suksdorf from Spangle near Spokane, WA, and until recently, the only authentic material of this taxon has been the type specimen."

Species Information

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Perennial semiterrestrial or terrestrial plants from a short 2-lobed rootstock.
Deciduous, flaccid, 5-25 cm long, with long transparent lower parts and black-tinged bases.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lake margins exposed in summer, in the steppe and montane zones; rare in SC and SE BC; S to MT and CA, disjunct in N UT.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

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General References