Grasses are flowering plants, too. Where are the petals, the sepals and the reproductive parts? If you want to study grasses, you need a whole new vocabulary.
I have learned the names of a few common grasses: wild oats, purple needlegrass and Italian ryegrass. I mostly use the plant’s structure or branching patterns. For any further plant identification, you need a hand lens, a good key, a knowledge of the vocabulary and patience.
Grass flowers grow in spikelets composed of florets.