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Volume II (1970) - Flora of New Zealand Indigenous Tracheophyta - Monocotyledons except Graminae
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Spirodela oligorrhiza (Kurz) Hegelm.

S. oligorrhiza (Kurz) Hegelm. Die Lemnaceen  1868,  147.

Lemna oligorrhiza Kurz in J. Linn. Soc. (Bot.)  9,  1867,  267.

Type locality: India. Also reported from Australia, Fiji, N. Caledonia, N. America, China.

Platelets to 5 × 3 mm., elliptic-obovate, slightly asymmetric; dorsal surface green, flat to convex; ventral surface convex, ± inflated, us. strong red-purple; nerves obscure. Roots 2–5. Spathe open along one side. Fr. ovoid, 1-seeded. Seed ribbed, reticulate; operculum prominent.

DIST.: N., S., Ch.

Still, fertile waters; in S. known only east of the main divide.

FL. 11–12–(3). FT. 1–3.

Apparently first recorded in N.Z. in 1930 by Lancaster (T.N.Z.I. 60, 563).

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