Achnanthes Inflata Guide
Credit: David Burge
  1. Valve margin triundulate
  2. Raphe valve with central fascia
  3. Areolae distinct
  4. Rapheless valve with eccentric axial area

Valves are broad, with triundulate margins. The raphe valve face has a broad, central fascia. The rapheless valve has a narrow, eccentric axial area that crosses one side of the central undulation. Areolae are uniseriate and distinctly punctate.