Jepson eFlora: Taxon page
Vascular Plants of California
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Higher Taxonomy
Family: HydrangeaceaeView DescriptionDichotomous Key

Habit: 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.
Genera In Family: 18 genera, +- 250 species: generally temperate, subtropical northern hemisphere; some cultivated for ornamental (Carpenteria, Hydrangea, Philadelphus). Note: Philadelphaceae in TJM (1993).
eFlora Treatment Author: Robert E. Preston & Charles F. Quibell
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Habit: Shrub < 2 m; herbage generally densely hairy. Stem: bark gray to +- red-brown, peeling as narrow strips. Leaf: deciduous, widely ovate to +- round, pinnately veined, margin toothed, sparsely hairy to +- glabrous above, canescent below. Inflorescence: terminal, flowers 1 or in cymes. Flower: sepals 4 or 5, lanceolate to narrowly ovate; petals 4 or 5, obovate or oblanceolate; stamens [8]10, alternating long and short, filament base wide and flat; chambers 3--5, 1 in fruit, placentas parietal, ovules many, styles 3--5, free, stigma terminal. Fruit: conic to ovoid, septicidal, styles persistent, spreading in fruit. Seed: many, with net-like ridges.
Species In Genus: 2 species: southwestern United States, northern Mexico. Etymology: (Edwin P. James, naturalist, 1797--1861)
Jepson eFlora Author: Robert E. Preston & Charles F. Quibell
Reference: Holmgren & Holmgren 1989 Brittonia 41:335--350
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Citation for this treatment: Robert E. Preston & Charles F. Quibell 2012, Jamesia, in Jepson Flora Project (eds.) Jepson eFlora, /eflora/eflora_display.php?tid=9630, accessed on February 22, 2020.

Citation for the whole project: Jepson Flora Project (eds.) 2020, Jepson eFlora,, accessed on February 22, 2020.