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Guide to Achnanthes tumescens

R.L.Lowe and A.R.Sherwood 2009

Achnanthes Tumescens Guide
Credit: Rex Lowe
  1. Valves linear-lanceolate
  2. Central valve gibbous
  3. Raphe valve with nearly rectangular central area
  4. Rapheless valve with eccentric axial area

Valves are linear-lanceolate, with a gibbous center and broadly rounded ends. The raphe valve has a nearly rectangular central area that extends to the valve margins. The axial on the rapheless valve is positioned near the valve margin.