Jepson eFlora
Key to families | Table of families and genera

Key to Isoetes

View taxon page for Isoetes

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

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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