Checklist of Plants of India

Achnanthidium exiguum (Grunow) Czarn., Proc. Int. Diatom Symp. 11 [Mem. Calif. Acad. Sci. 17]: 157. 1994.

var. exiguum
Achnanthes exigua  Grunow in Van Heurck, Syn. diatom. Belgique: expl. pl. 27: fig. 29. 1880.
Freshwater, terrestrial & thermal springs – Peninsular India (Karthick & al. 2013), Uttarakhand (Verma & Nautiyal 2009).

var. heterovalvum (Krasske) Czarn., Proc. Int. Diatom Symp. 11 [Mem. Calif. Acad. Sci. 17]: 157. 1994.
Achnanthes exigua  Grunow var. heterovalvata  Krasske, Bot. Arch. 3: 193, figs. 9a, 9b. 1923.
Freshwater