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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.
Shrub < 3 m. Stem: bark red-brown, aging gray, peeling as narrow rectangles or strips; twigs glabrous to hairy. Leaf: deciduous, petioled; blade 3-veined from base, ± glabrous to hairy, margin entire to toothed. Inflorescence: flower 1, or raceme to panicle, terminal, ± open. Flower: fragrant; sepals 4–5, glabrous to hairy; petals 4–5, white; stamens generally many, clustered, filaments linear, fused at base; ovary 1/2 to completely inferior, chambers 4–5, placentas axile, ovules many, style 1, branches generally 4, stigmas linear along style branches. Fruit: becoming woody, generally loculicidal. Seed: many, generally fusiform, generally brown.
± 65 species: temperate America, Eurasia. (Greek: for Ptolemy Philadelphus, Greek king of Egypt, 309–247 BC) [Frazier 1999 New Mexico Botanist 13:1–6] Many intergrading infraspecific taxa described; more study needed to determine which warrant recognition.
Unabridged references: [Hitchcock 1943 Madroño 7:35–56; Hu 1956 J Arnold Arbor 37:15–90]
1. Flower 2–3 cm wide; inflorescence raceme, flowers 6+; leaf blade 25–75 mm, sparsely strigose beneath ..... P. lewisii
1' Flower 1–1.5 cm wide; inflorescence not raceme, flowers 1–3; leaf blade 8–25 mm, densely strigose beneath ..... P. microphyllus
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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