Aligning toward the south from bud to day 15 in the bloom cycle of two C. texana heads (Feb. 24 — March 11, 2011).
(Place the cursor on the image to see the date, day into the bloom cycle, and time of day. Click on an image for a larger view.)
The well–developed buds (photo 1) are not aligned toward the sun — the upper head being directed toward the north, and these positions are held into day 1 of anthesis (#2). By day 5 (#3 & #4) the upper head has moved toward the southwest, even from early morning to midday. By day 9 both heads are ‘in sync’ and rise and lower together, pointing south.
