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Each genus has representative species illustrated with a line drawing that, in combination with keys and descriptions, will facilitate identifications of these groups of plants. One of the most genera treated on this volume with essentially the most species in the flora area include: Boechera, Cardamine, Draba, Lepidium, Physaria, and Streptanthus (Brassicaceae) with 109, 39, 121, 42, 88, and 35 species, respectively; plus Salix and Populus (Salicaceae) with 113 and 8 species, respectively. Three families are represented in the flora each and every with a single introduced species: Caricaceae (Papaya circle of relatives), Moringaceae (Drumstick tree circle of relatives), and Tropaeolaceae (Nasturtium circle of relatives).
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