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The terms listed here are just a drop in the bucket. See the links page for more info on botanical terms.
Regular flowers are generally round and have petal-like parts (what appears to be a petal isn't always a true petal) of similar size and shape radiating from the center. Icons show the most common number of petal-like parts for a species:
A cluster is a tightly formed group of flowers. 6 basic shapes are used on this site, though there are many variations of these that you would find in more technical references. For purposes of easy identification, go by what it looks like, even though that may not be technically correct.
Leaves are attached to the main stem in a number of different ways and some plants will have more than one type of attachment. For simplicity, I use just the following:
There are many leaf shapes, but only a few basic types used on this site: