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Family Hydrangeaceae

Synonyms: Philadelphaceae APNI*

Description: Evergreen or deciduous shrubs or herbs, rarely lianas.

Leaves alternate or opposite, simple, usually entire, petiolate, epulvinate, exstipulate.

Plants hermaphrodite. Inflorescences cymose or corymbose, sometimes capitate, sometimes racemose by reduction. Flowers regular, 4–10 merous. Calyx 4–5(-10)-lobed, usually fused, imbricate or valvate. Corolla 4–5(-10) lobed, imbricate, contorted or valvate, regular. Stamens 4 or 8, or numerous, all fertile. Carpels (2-)3–5. Ovary 1–3(-5) locular, partly inferior to inferior. Epigynous disk usually present. Styles (2-)3–5, free to partially joined, apical. Placentation parietal or axile. Ovules numerous, anatropous.

Fruit usually a loculicidal capsule, rarely indehiscent or a berry, many seeded.


Distribution and occurrence: 17 genera and about 170 species, Holarctic and Neotropical. Temperate to sub-tropical. Widespread North temperate and subtropical, and Andes from Mexico to Chile.

External links:
Angiosperm Phylogeny Website (Family: Hydrangeaceae, Order: Cornales)
Wikipedia

Text by K.D. Hill
Taxon concept:

Taxa not yet included in identification key
Deutzia,    Hydrangea


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