Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Microscopic examination of H. officinalis subsp. aristatus. (a) Diacitic stomata; (b) secretory hairs with an octocellular head; (c) secretory hairs with a bicellular head; (d) stubby, hook-shaped unicellular covering hairs; (e) pollen grains with slightly granular, six-slit exine.
