RUTACEAE

LXXXVIII. RUTACEAE View in CoL *

Herbs, shrubs or trees. Leaves alternate or opposite, simple or compound, dotted with translucent glands, exstipulate, sometimes reduced to spines. Flowers usually hermaphrodite and actinomorphic. Sepals 4-5, free or connate below. Petals 4-5. Disc present. Stamens as many or twice as many as the petals, rarely more, free or rarely monadelphous. Ovary superior, usually syncarpous and often 4- to 5-locular, but carpels occasionally united at the base only or rarely free. Styles as many as the carpels, free or connate. 1 Trees or large shrubs; fruit either fleshy or a samara

2 Leaves simple 4. Citrus

2 Leaves compound

3 Leaflets 5-13; fruit a black, fleshy drupe 5. Phellodendron

3 Leaflets 3(—5); fruit a flat, broadly winged samara 6. Ptelea

1 Herbs or dwarf shrubs; fruit a capsule

4 Leaves imparipinnate; leaflets 2*5-7*5 cm, distinctly serrulate; flowers zygomorphic, never yellow 3. Dictamnus

4 Leaves simple, 3(-5)-sect or 2- to 3-pinnatisect; lobes less than

2-5 cm, entire or obscurely crenate-serrate; flowers actinomorphic, yellow

5 Leaves 2- to 3-pinnatisect; petals 4, except in the central flower, dentate or fimbriate, rarely entire; filaments glabrous below 1. Ruta

5 Leaves simple or 3-sect, very rarely 5-sect; petals 5, entire; filaments hairy below on inner surface 2. Haplophyllum

Subfam. Rutoideae

Fruit a capsule, usually 4- to 5-valved. Seeds with endosperm.