The choice of botanical terms has been intentionally confined to those which long usage has so wrought into the common speech that they have practically ceased to belong to strictly scientific nomenclature. The floral families have been arranged in the order employed in Gray's Manual; the individual members of a genus, and of a family, have been placed in their usual sequence of bloom, that the flower-gatherer may know when to reasonably expect the successive blossoming of any special set of plants.

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