I tried taking some pictures for this tutorial, but they didn't look very helpful to me. So, for now, here is the pattern minus photos.
Using a size H hook, chain 4. Join the end to the first chain with a slip stitch to form a ring.
Round 1: (single crochet in the ring, chain 3) 6 times. Again, join the last stitch to the first single crochet with a slip stitch.
Round 2: (single crochet, chain 1, 3 double crochets, chain 1, single crochet) in each space created by the chain 3.
Round 3: Now you begin working in the back of the flower you have started creating. (single crochet around the first spoke, then chain 4) 6 times. Join last stitch to first stitch with a slip stitch.
Round 4: (single crochet, chain 1, 5 double crochets, chain 1, single crochet) in each space created by the chain 4.
Round 5: Repeat round 3, but chain 5 instead of 4. Join last stitch to first with a slip stitch and weave in ends.
If you want to add another layer of petals, repeat Round 3, increasing the number of stitches in the chain by one, and Round 4, increasing the double crochets by two.