The side edges of the stem are incurvate and usually ground.
The blade is usually straight; rarely, incurvate or excurvate.
The base is incurvate and usually thinned with some fine retouch.
The blade is usually straight; rarely, excurvate or incurvate.
The stem base is thinned and may be incurvate, straight or excurvate.
The blade is incurvate, beveled on each side ...