Plant families are groups of species closely related together. They are given latin names but most have a common name too. "Famous" plant families are the Palms (Arecaceae), the Cacti (Cactaceae), the Bromeliads (Bromeliaceae), the Cycads (Cycadaceae) and so on.
Different plants will bloom in different times of the year. Some species are very precise and will bloom each year in the same months. Other plants in turn, will bloom during a whole season or "througout the warm months".
This is a rough indication of the final size that a species can eventually attain. Of course, it will give you a general idea, but environmental conditions can change this datum. For example, the same plant species will grow much taller in an area with more rain and less wind and much shorter in harsher conditions.