Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Charles F. Quibell

Shrub, subshrub
Stem < 3 m, generally erect; bark generally peeling as thin sheets or narrow strips
Leaves 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; sepals 4–7, free, spreading or erect; petals 4–7, free, ± round to narrowly elliptic, generally white; stamens 10–12 in 2 whorls or many and clustered, filament base linear or wide and flat; pistil 1, ovary superior to 2/3 inferior, chambers 2–8, ovules 1–2 or many per chamber, placentas axile or parietal, styles 3–8, free or fused at base
Fruit: capsule, loculicidal or septicidal; styles persistent or not
Seeds generally many, small to minute
Genera in family: 7 genera, 130 species: temp, subtropical n hemisphere; some cultivated for ornamental (Carpenteria, Deutzia, Philadelphus)
Recent taxonomic note: Recently treated within Hydrangeaceae [Soltis et al. 1995 Amer J Bot 82: 504–514]



Shrub < 3 m
Stem: bark red-brown, aging gray, peeling as narrow strips or narrow rectangles; twigs glabrous to hairy
Leaves deciduous, petioled; blade 3-veined from base, ± glabrous to hairy, margin entire to toothed
Inflorescence: raceme, panicle, or flower one, terminal, ± open
Flower fragrant; sepals 4–5, glabrous to hairy; petals 4–5, white; stamens generally many, clustered, filaments linear, fused at base, ovary inferior to half-inferior, chambers 4–5, placentas axile, ovules many, style 1, branches generally 4 above middle, stigma linear along style branch
Fruit becoming woody, generally loculicidal
Seeds many, generally fusiform, generally brown
Species in genus: ± 65 species: temp Amer, Eurasia
Etymology: (Greek: for Ptolemy Philadelphus, Greek king of Egypt, 309–247 B.C.)
Reference: [Hu 1956 J Arnold Arbor 37:15–90]


P. microphyllus A. Gray


Leaf: petiole 5–18 mm; blade 8–25 mm, 3–8 mm wide, narrowly ovate to elliptic, margin entire, ± rolled under
Inflorescence: flowers 1–3
Flower 1–1.5 cm wide; sepals 3–5 mm, petals 6–8 mm, widely elliptic
Ecology: Rocky slopes, cliffs
Elevation: 1200–2750 m.
Bioregional distribution: e Peninsular Ranges (San Jacinto Mountains, Santa Rosa Mtns), White and Inyo Mountains, e Desert Mountains
Distribution outside California: to Texas, n Mexico
Flowering time: May–Jul
Synonyms: subsp. stramineus (Rydb.) C.L. Hitchc
Plants with leaf blades 8–12 mm, rough-hairy above have been called subsp. pumilus (Rydb.) C.L. Hitchc
Reference: [Hitchcock 1943 Madroño 7:35–56]
Horticultural information: DRN, IRR: 1, 2, 3, 7, 10, 14, 15, 16, 18.

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bioregional map for PHILADELPHUS%20microphyllus being generated
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Philadelphus microphyllus
Retrieve dichotomous key for Philadelphus
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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