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Isoetes howellii

From Wikipedia, the free encyclopedia

Isoetes howellii

Apparently Secure (NatureServe)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Lycophytes
Class: Lycopodiopsida
Order: Isoetales
Family: Isoetaceae
Genus: Isoetes
Species:
I. howellii
Binomial name
Isoetes howellii
Synonyms
  • Isoetes melanopoda Gay & Dur. var. californica A.A. Eat.

Isoetes howellii, or Howell's quillwort, is a species of quillwort, a type of lycophyte. It is an aquatic plant native to North America.

Distribution

Isotes howelii is found in western North America and grows in wet habitats such as vernal pools.

Description

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.

References

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

External links


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This page was last edited on 31 December 2023, at 23:21
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