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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

HYDRANGEACEAE HYDRANGEA FAMILY

Robert E. Preston & Charles F. Quibell


Perennial herb to small tree or vine. Stem: < 3 m, generally erect; bark generally peeling as thin sheets or narrow strips. Leaf: generally simple, opposite, deciduous or not, ± hairy; stipules 0; blade ± round to narrowly elliptic, entire or toothed. Inflorescence: cyme, raceme, panicle, or flower 1, terminal or axillary, generally bracted. Flower: bisexual, radial, flowers on inflorescence margins occasionally sterile and enlarged; sepals 4–10, free or fused at base, spreading or erect; petals 4–7, free, ± round to narrowly elliptic; stamens 8–12 in 2 whorls or many and clustered, filament base linear or wide and flat; pistil 1, ovary superior to inferior, chambers 2–8, ovules 1–2 or many per chamber, placentas axile or parietal, styles 1–8, free or fused at base. Fruit: capsule, loculicidal or septicidal; styles persistent or not. Seed: generally many, small to minute, oblong to fusiform, winged or not.
18 genera, ± 250 species: generally temperate, subtropical northern hemisphere; some cultivated for ornamental (Carpenteria, Hydrangea, Philadelphus). [Hufford et al. 2001 Int J Plant Sci 162:835–846] Philadelphaceae in TJM (1993). —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.
Unabridged references: [Hufford 1997 Int J Plant Sci 158:652–672; Soltis et al. 1995 Amer J Bot 82:504–514]

Key to Hydrangeaceae

1. Flowers < 8 mm wide, odorless; sepals 1.5–2 mm, ± deciduous; petals 3–6 mm

2. Leaf blade 8–16 mm, 3–6 mm wide; fruit ± cylindric, styles persistent; trunk or main stem erect; White and Inyo Mountains, Desert Mountains ..... FENDLERELLA

2' Leaf blade 15–40 mm, 10–30 mm wide; fruit spheric, styles deciduous; main stem prostrate; coastal mtns ..... WHIPPLEA

1' Flowers >= 10 mm wide, fragrant; sepals 3–10 mm, persistent; petals 5–25 mm

3. Stamens 10, alternating long and short; filament base wide, flat; stigma terminal, < 0.5 mm ..... JAMESIA

3' Stamens > 20, ± equal, filament base ± linear; stigma linear along style branches, > 1 mm

4. Flowers 3–6 cm wide; leaves 1-veined from base, persistent, leathery; ovary ± superior; petals ± round; c&s Sierra Nevada Foothills (Fresno Co.) ..... CARPENTERIA

4' Flowers 1–3 cm wide; leaves 3-veined from base, deciduous; ovary 1/2 to completely inferior; petals oblong to elliptic ..... PHILADELPHUS

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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