Isoetes howellii

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Isoetes howellii

Apparently Secure (NatureServe)
Scientific classification
Kingdom: Plantae
Division: Lycopodiophyta
Class: Isoetopsida
Order: Isoetales
Family: Isoetaceae
Genus: Isoetes
Species: I. howellii
Binomial name
Isoetes howellii
  • Isoetes melanopoda Gay & Dur. var. californica A.A. Eat.

Howell's quillwort (Isoetes howellii) is a species of quillwort, a type of lycopod. It is an aquatic plant native to western North America and grows in wet habitats such as vernal pools. It produces 5 to 28 pointed, cylindrical, bright green leaves that can reach 30 centimeters in length. The velum covers roughly one third of the spherical sporangia, which is 6 millimeters long. The ligule is in the shape of an elongated triangle. The megaspores are 420 to 610 micrometers in diameter. The coarse microspores are 25 to 30 micrometers long.[1] It is closely related to I. melanopoda and was first thought to be a variation of that species.


  1. ^ Cody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada. 

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