Describe, in order, how you would draw the floral diagram of a bracteate flower with four free…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Describe, in order, how you would draw the floral diagram of a bracteate flower with four free sepals, four free petals, four free stamens and two joined carpels.
Need a reminder? The key ideaShow
A floral formula is written in the order Br, symmetry sign, sex sign, K, C or P, A, G. A number gives how many parts there are. Brackets show that parts are fused, and a plus joins two groups. A line under G is a superior ovary, and a line over G is an inferior ovary. In a floral diagram, the mother axis is a dot at the top, the calyx is outermost and the gynoecium is at the centre.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The mother axis. Draw a dot at the top.
Step 2. The bract. Draw a small arc on the side away from the dot.
Step 3. The calyx. Draw four sepals in the outermost ring.
Step 4. The corolla. Draw four petals in the next ring.
Step 5. The androecium. Draw four stamens inside the petals.
Step 6. The gynoecium. Draw the two joined carpels as one ovary at the centre.
Answer: dot, bract, four sepals, four petals, four stamens, one two-carpel ovary at the centre.
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