Isoetes howellii
Introduction '''''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. It is closely related to ''I. melanopoda'' and was first thought to be a variation of that species.
References
External links * Jepson Manual Treatment* USDA Plants Profile* Photo gallery