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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


Alice Long Heikens & Barbara Ertter

Shrub, ± strigose. Leaf: deciduous; shallow-lobed, toothed; stipules linear. Inflorescence: umbel-like cluster; pedicel bractlets 0. Flower: hypanthium flat, bractlets 0; sepals 5–6, ± toothed; petals 0–2; stamens ± 50[100+], filaments showy, white, ± expanded; pistils 2–6, ovary superior, strigose, chamber 1, ovule 1. Fruit: achene, wall ± soft.
2 species: California, southeastern United States. (Reverend R.D. Nevius, 1827–1913)

N. cliftonii Shevock et al. SHASTA SNOW-WREATH
Plant 5–25 dm, erect. Stem: branches slender. Leaf: petiole generally 4–10 mm; blade 20–60 mm, ovate to cordate, sharp-toothed, sparsely strigose. Inflorescence: flowers generally 3–5; pedicels 1–3 cm. Flower: sepals 4–6 mm, ± obovate; petals 0–2, 4–6 mm, clawed, white; filaments 4–5 mm. Fruit: 3–4 mm.
Shaded, n-facing slopes; 300–600 m. Klamath Ranges (near Lake Shasta). Petal number uncertain. Apr–May [Online Interchange] {CNPS list}
Unabridged note: Expanded author citation: Neviusia cliftonii Shevock, Ertter & D.W. Taylor

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Mar 30 2015
Citation for this treatment: [Author of taxon treatment] 2013. Neviusia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Mar 30 2015

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click for enlargement Neviusia cliftonii
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1993 Dean Wm. Taylor

Geographic subdivisions indicated for the distribution of Neviusia cliftonii 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.