A double dose of four and nerves
The last post might have left you wondering how a four-sided bud of Tetragonotheca texana opens into a flower head. The post before that one showed two fully open flower heads stuck together, but you saw only glimpses of green representing the four bracts that had surrounded each developing flower head. Today’s picture should make clear how the bracts separate and fold down as the flower head opens.
If you’re also wondering about the title of this post, the first nerve is the one in nerve-ray, a colloquial name for this wildflower. The other nerve comes from the Tetraneuris linearifolia, or four-nerve daisies, that were in the background and account for the yellow haze across the bottom of the photograph. The two fours are the tetras at the beginning of the genus names Tetragonotheca and Tetraneuris.
© 2012 Steven Schwartzman