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Rutaceae
See list of 5 genera in this family-
1a. Flowers weakly zygomorphic; petals 20–25 mm long; stamens declined and upwardly curved near apex
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1b. Flowers actinomorphic; petals up to 10 mm long; stamens ± straight
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2a. Herbaceous plants with bipinnatifid leaves; fruit a 4- or 5-lobed capsule; flowers all bisexual, with yellow petals 8–10 mm long
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2b. Shrubs or trees with pinnately compound leaves; fruit a samara, drupe, or follicle; some or all of the flowers on a given plant unisexual (the unisexual flowers in Ptelea by imperfect or abortive stamens), with green-white, yellow-white, or yellow-green petals up to 7 mm long
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3a. Leaves with 3 leaflets; fruit a ± orbicular samara; plants polygamous (i.e., some flowers bisexual, others unisexual, in the latter case the carpellate flowers functionally unisexual due to imperfect or abortive stamens)
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3b. Leaves with 5–13 leaflets; fruit a drupe or fleshy follicle; plants dioecious (i.e., all the flowers unisexual)
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4a. Leaves opposite; branches unarmed; fruit a drupe
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4b. Leaves alternate; branches armed with prickles; fruit a fleshy follicle
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Each photo represents one genus in this family.