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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

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.
2 species: southwestern United States, northern Mexico. (Edwin P. James, naturalist, 1797–1861) [Holmgren & Holmgren 1989 Brittonia 41:335–350]

J. americana Torr. & A. Gray var. rosea C.K. Schneid. ROSY-PETALLED CLIFFBUSH
Shrub < 1 m. Stem: bark generally gray. Leaf: petiole 2–6 mm; blade 1.5–4 cm, 1–2 cm wide. Inflorescence: terminal cyme; flowers (1)3–11. Flower: 1.2–1.5 cm wide, ± fragrant; sepals 5, 3–4 mm, gray-strigose; petals 5, 5–8 mm, elliptic to obovate, generally pink; stamens 10; ovary 1/2-inferior, styles > sepals. Fruit: 1–1.3 cm, conic. Seed: fusiform, brown.
Rocky slopes, cliffs; 2070–3700 m. c&s High Sierra Nevada, White and Inyo Mountains, n Desert Mountains (Panamint Range, Grapevine Mtns); western Nevada (Sheep Range, Spring Mountains). Other varieties in Great Basin Floristic Province outside California, Rocky Mountains. Jul–Aug [Online Interchange] {CNPS list}
Unabridged synonyms: [Edwinia californica Small; Jamesia americana subsp. californica (Small) E. Murray; Jamesia americana var. californica (Small) Jeps.; Jamesia californica Fedde.]
Unabridged note: Expanded author citation: Jamesia americana Torr. & A. Gray var. rosea Purpus ex C.K. Schneid.

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Next taxon: Philadelphus


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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Dec 1 2015
Citation for this treatment: [Author of taxon treatment] 2013. Jamesia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Dec 1 2015

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click for enlargement Jamesia americana var. rosea
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© 2005 Steve Matson

Geographic subdivisions indicated for the distribution of Jamesia americana var. rosea Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.