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Key to families | Table of families and genera
This text currently parallels The Jepson Manual: Vascular Plants of California, Second Edition that is now available at the University of California Press.
Text appearing in blue on this page will not appear in the printed book; it will be displayed only on the Web. 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.
Leaf: simple, alternate or clustered on short- shoots, entire to serrate, generally glabrous, generally glandular on teeth and at blade-petiole junction, veins pinnate; stipules deciduous.
Inflorescence: raceme, cluster, or flowers 1; pedicel bractlets 0.
Flower: hypanthium cup- to urn-shaped, deciduous in fruit, bractlets 0; sepals erect to reflexed; stamens generally 10–30, generally in 2+ whorls; pistil 1, ovary superior, chamber 1, ovules 2, style 1, stigma ± spheric or disk-like.
Fruit: drupe, generally ovoid to spheric.
200+ species: worldwide, especially n temperate. (Greek: plum, prune) Seeds of many species ± TOXIC from production of hydrocyanic acid. Many cultivated for wood, ornamental, edible fruit; some persisting near human habitations, some possibly naturalized (e.g., Prunus laurocerasus L.).
Unabridged note: Many cult for wood, ornamental, edible fruit; some persisting near human habitation (Prunus armeniaca L., apricot; Prunus avium (L.) L., sweet cherry; Prunus caroliniana (Mill.) Aiton; Prunus cerasus L., sour cherry; Prunus domestica L., plum; Prunus laurocerasus L., laurel cherry; Prunus lusitanica L., Portugal laurel; Prunus mahaleb L.; Prunus munsoniana W. Wight & Hedrick; Prunus speciosa (Koidz.) Nakai; Prunus yedoensis Matsum.).
1. Infl an elongate raceme, flowers 15–many
2. Lvs deciduous, finely serrate; inflorescence leafy at base; fruit 6–14 mm ..... P. virginiana var. demissa
2' Lvs evergreen, entire or spiny-serrate; inflorescence leafless at base; fruit 12–25 mm ..... P. ilicifolia
3. Lf margin spiny-serrate, ± wavy, blade widely ovate to round; petiole 3–10 mm; s NCoR, CW, SW (except ChI) ..... subsp. ilicifolia
3' Lf margin generally entire, flat, blade generally ovate; petiole 8–25 mm; ChI ..... subsp. lyonii
1' Infl a short, ± flat-topped raceme or umbel-like to subsessile cluster, flowers 1–12
4. Ovary, fruit generally glabrous
5. Infl raceme; sepal entire; fruit 7–14 mm; twigs with true terminal bud ..... P. emarginata
5' Infl umbel-like; sepal gland-toothed to nearly entire; fruit 15–30 mm; twigs with false terminal bud
6. Lf blade elliptic to (ob)ovate, base obtuse; flowers 1(2), appearing before leaves; tree, roadsides, streambanks, chaparral as waif ..... P. cerasifera
6' Lf blade oblong-ovate to ± round, base rounded to subcordate; flowers 2–5, appearing with leaves; shrub, mixed-evergreen or conifer forest ..... P. subcordata
4' Ovary, fruit densely puberulent or velvety
7. Tree 3–10 m, not thorny; leaf blade 25–150 mm; fruit 25–80 mm; petals 10–25 mm
8. Petiole (8)10–25 mm; leaf blade 25–100 mm; petals pink to nearly white; fruit pulp leathery ..... P. dulcis
8' Petiole 5–10(15) mm; leaf blade (50)70–150 mm; petals dark pink; fruit pulp fleshy ..... P. persica
7' Shrub < 4 m, often thorny; leaf blade 5–30 mm; fruit 7–18 mm; petals 1.4–12 mm
9. Lf blade < 2 × longer than wide, base wedge-shaped to rounded or subcordate
10. Lf blade ovate to obovate, ± hairy, base wedge-shaped to obtuse; flowers generally unisexual; hypanthium, sepals densely puberulent abaxially ..... P. eremophila
10' Lf blade ovate to round, glabrous, base obtuse to rounded or subcordate; flowers bisexual; hypanthium, sepals glabrous abaxially ..... P. fremontii
9' Lf blade >= 2 × longer than wide, base long-tapered
11. Petals (5)8–11 mm, dark pink to nearly white; pedicel (1)4–12 mm; leaf blade 2–6 mm wide, finely serrate ..... P. andersonii
11' Petals 1.4–4 mm, white to ± yellow; pedicel 0–4 mm; leaf blade 1–2(4) mm wide, generally entire ..... P. fasciculata
12. Lf puberulent; s SNF, Teh, s SCoRI, n TR, e PR, D ..... var. fasciculata
12' Lf glabrous to low-papillate; s CCo, s SCoRO ..... var. punctata
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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