S = Spiraea subfamily, R = Rose subfamily, A = Peach subfamily, M = Apple subfamily
This lecture is about the Rose Family, Rosaceae, however it is important to know that the Grass Family (Poaceae) is the world's most important plant family in terms of humans. Over half the basic nutrition and calories for humans comes from the Grass Family. It is quite correct to say that the Grass Family makes life possible for humans.
Left photo by K. R. Robertson in the state of Parana, Brazil; right photo by K. R. Robertson & D. L. Nickrent from seeds in the herbarium of the Illinois Natural History Survey.
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