Trichomes of accession 602

A. Trichomes of the leaves, axes, and abaxial faces of the perianth are uniseriate, multicellular, unbranched, gradually taper to a point and appear to be nonliving.

B. Trichomes of the adaxial face of the corolla are living, only distal cells contain dense cytoplasm, and the terminal cell is rounded.

C. Trichomes of the abaxial face of the corolla (also found on leaves) are living and have a multicellular head borne on a unicellular stalk. The multicellular head stains densely with neutral red but the stalk cell does not absorb this stain.

Illustrations by Luis A. Serazo.