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Key to families | Table of families and genera

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Daniel Potter & Barbara Ertter, family description, key to genera; treatment of genera by Daniel Potter, except as noted

Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0–3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0–5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5–many, anther pollen sacs generally 2; pistils (0)1–many, simple or compound, ovary superior to inferior, styles 1–5. Fruit: 1–many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1–5 stones. Seed: generally 1–5 (per fruit, not per flower).
110 genera, ± 3000 species: worldwide, especially temperate; many cultivated for ornamental, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. [Potter et al. 2007 Plant Syst Evol 266:5–43] Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis. —Scientific Editors: Daniel Potter, Thomas J. Rosatti.
Unabridged references: [Robertson 1974 J Arnold Arbor 55:303–332, 344–401, 611–662]

Key to Rosaceae


Steve Junak & Dieter H. Wilken

1 sp. (Greek: Lyon's shrub, for W.S. Lyon, early resident of Los Angeles)

L. floribundus A. Gray
Tree, evergreen. Stem: trunk bark gray to red-brown, peeling in strips. Leaf: opposite, simple or compound; stipules deciduous; petiole 1–3 cm; blade ± gray abaxially, dark shiny green adaxially. Inflorescence: panicle, generally flat-topped; pedicel bractlets 1–3, at top. Flower: hypanthium bell-shaped, tomentose, bractlets 0; sepals persistent; petals ± round, white; stamens ± 15; pistils 2, ovary superior, style stout, stigma ± head-like. Fruit: follicles 2, 3–4 mm, woody. Seed: 1–4, ± 2 mm, compressed, ± brown. Subspecies hybridize in cultivation; endemic to Channel Islands. [Online Interchange]

Key to Lyonothamnus floribundus

L. floribundus subsp. floribundus SANTA CATALINA ISLAND IRONWOOD
Plant 5–15 m. Leaf: 7–17 cm, linear to oblong, generally entire (crenate to irregularly lobed).
2n=±48. Rocky slopes, canyons, oak woodland, chaparral; 100–500 m. s Channel Islands (Santa Catalina Island). Threatened by feral animals. Seedling leaves often compound. May–Jun [Online Interchange] {CNPS list}

Previous taxon: Lyonothamnus floribundus subsp. aspleniifolius
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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Mar 26 2015
Citation for this treatment: [Author of taxon treatment] 2013. Lyonothamnus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Mar 26 2015

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Geographic subdivisions indicated for the distribution of Lyonothamnus floribundus subsp. floribundus 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.