|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Isoetaceae||View Description||Dichotomous Key|
|Genus: Isoetes||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Isoetes howellii Engelm.
Habit: Plant becoming terrestrial. Leaf: deciduous, < 30 cm, rigid, not brittle, tapered to tip, bright green; base +- brown to black. Chromosomes: 2n=22.
Ecology: Vernal pools, lake margins; Elevation: generally < 1500(2900) m. Bioregional Distribution: KR, NCoR, CaR, SNF, n SNH, GV, CCo, SnFrB, SCoR, SCo, PR; Distribution Outside California: to Washington, Montana, Utah. Note: Small plants of SCo, Washington, Baja California (leaf < 10 cm, female spore < 0.42 mm) are assignable to Isoetes howellii var. minima (A.A. Eaton) N. Pfeiff., recognition of which remains questionable pending further research, although it is +- clear that it should not be treated as an infraspecific taxon of Isoetes howellii. Spores mature late spring, summer.
eFlora Treatment Author: W. Carl Taylor & Jon E. Keeley
Jepson Online Interchange
Previous taxon: Isoetes echinospora
Next taxon: Isoetes nuttallii
Citation for this treatment: W. Carl Taylor & Jon E. Keeley 2017. Isoetes howellii, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=29392, accessed on February 19, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 19, 2017.