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Parent: ISOETES L., 1753

1. I. kirkii A. Braun in Monatsb. Akad. Berl. July 1869.

Submerged, axis short, deeply 3-lobed; lvs up to 30, 5 cm. to 3 dm. long, filiform, pale green. Sporangia broadly oblong, c. 3 mm. long. Megaspores white, studded with minute, unequal tubercles; microspores very ∞, minute.

DIST.: N., Wairua R. (lat. 35° 40'), mid-Waikato basin, L. Rotokakahi, L. Taupo; S., L. Tekapo, and neighbouring tarns (lat. 44°).