Isoëtes maritima
Bot. Gaz. 13: 94. 1888..
Common names: Maritime quillwort
Synonyms: Isoëtes beringgensis Komarov Isoëtes echinospora subsp. maritima (L. Underwood) A. Löve Isoëtes echinospora var. maritima (L. Underwood) A. A. Eaton Isoëtes macounii
Treatment appears in FNA Volume 2.
Revision as of 21:13, 27 May 2020 by imported>Volume Importer
Plant usually aquatic, occasionally emergent. Rootstock nearly globose, 2-lobed. Leaves ± deciduous, bright green, pale toward base, spirally arranged, to 12 cm, pliant, gradually tapering toward tip. Velum covering less than 1/2 of sporangium. Sporangium wall ± brown-streaked. Megaspores whtie, 380–600 μm diam., echinate to short-cristate with stout blunt spines and crests; girdle densely echinate. Microspores gray to brown in mass, 30–40 μm, papillose. 2n = 44.
Phenology: Spores mature late summer.
Habitat: Lakes and streams
Distribution
B.C., Alaska, Wash.
Discussion
Isoëtes maritima hybridizes with I. echinospora and I. occidentalis [ = I. truncata (A. A. Eaton) Clute].
Selected References
None.
Lower Taxa
None.