Isoetes nuttallii

Calamaria nuttallii (A.Braun) Kuntze Calamaria suksdorfii (Baker) Kuntze Isoetes opaca Nutt.

Isoetes suksdorfii Baker Isoetes nuttallii, or Nuttall's quillwort, is a species of quillwort, a type of lycopod.

It is native to shallow waters and other wet habitats of western North America from British Columbia to California.

It produces up to 60 pointed, cylindrical, green to gray-green leaves, each 7 to 17 centimeters long.

The microspores, which are spiny and covered in tubercles, are 28 to 31 micrometers long.