Jepson eFlora
Key to families | Table of families and genera

Key to Isoetes

View taxon page for Isoetes

1. Plant terrestrial (or becoming so), of seasonally wet soil, lake margins, temporary streams, vernal pools; generally < 1500 m

2. Translucent membrane covering < 75% of sporangium ..... I. howellii

2' Translucent membrane covering > 75% of sporangium

3. Plant of wet soil; leaf generally > 8 cm, > 1 mm wide at middle, rigid, ± brittle ..... I. nuttallii

3' Plant of vernal pools; leaf generally < 8 cm, < 1 mm wide at middle, soft, flexible ..... I. orcuttii

1' Plant underwater in persistent lakes or pools; generally > 1500 m

4. Female spores prickly ..... I. echinospora

4' Female spores ridged or tubercled

5. Leaf abruptly tapered to tip; female spore 0.3–0.5 mm diam ..... I. bolanderi

5' Leaf gradually tapered to tip; female spore 0.5–0.7 mm diam ..... I. occidentalis

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Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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