Isoëtes maritima
Bot. Gaz. 13: 94. 1888..
Common names: Maritime quillwort
Synonyms: Isoëtes beringgensis KomarovIsoëtes echinospora subsp. maritima (L. Underwood) A. LöveIsoëtes echinospora var. maritima (L. Underwood) A. A. EatonIsoëtes macounii unknown
Treatment appears in FNA Volume 2.
Revision as of 19:10, 26 July 2019 by FNA>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.
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.