Frangula Mill.

Buckthorn (en), Bourdaine (fr)

Genus

Angiosperms > Rosales > Rhamnaceae

Characteristics

Shrubs or trees, unarmed; bud scales absent, buds hairy. Leaves usually deciduous, sometimes persistent, alternate [rarely opposite], rarely fascicled on short shoots; blade not gland-dotted; pinnately veined, secondary veins nearly straight, parallel. Inflorescences axillary, within foliage, umbels or fascicles, or flowers solitary; peduncles and pedicels not fleshy in fruit. Pedicels present. Flowers bisexual; hypanthium cup-shaped, 1–3 mm wide, usually circumscissile far below sepal bases, rarely not circumscissile; sepals (rarely 4–)5, usually ± erect, sometimes spreading, yellowish to green or white, ovate-triangular, fleshy, keeled adaxially; petals (rarely 4–)5, yellowish, hooded, broadly obovate to obcordate, clawed; nectary thin, lining hypanthium; stamens (rarely 4–)5; ovary superior, (2–)3-locular; style 1. Fruits drupes; stones 2–3(–4), indehiscent but open at base. Seeds obovoid to lenticular, with cartilaginous beak protruding through opening in stone, not furrowed. x = 20–26.
More
Shrubs or small trees, not armed, mostly deciduous; indumentum of simple hairs or 0. Winter buds naked. Lvs alternate, mostly large, with caducous, subulate stipules. Fls small, axillary, in sessile or pedunculate fascicles or umbel-like cymes, rarely solitary, usually ☿, usually 5-merous. Calyx lobes triangular. Petals with narrow claw, ± hooded. Stamens ± included. Ovary 3-celled, free from disc; style 1; stigma 3-lobed. Fr. a drupe with 2-4 nutlet-like pyrenes. Seed smooth; germination hypogeal.
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Sexuality hermaphrodite
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Hardiness (USDA) 4-9

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