Fig. 1.
(A) The achene wall often covers the cotyledons of young (7 d old in the figure) sunflower (Helianthus annuus) seedlings. (B) After removing the achene wall, the yellowish, pale colour of the covered cotyledon part can be seen.
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.