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Key to families | Table of families and genera

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ROSACEAE ROSE FAMILY

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

IVESIA

Barbara Ertter

Perennial herb, glandular; odor resinous. Leaf: generally basal, odd-1-pinnately compound, generally ± cylindric; cauline generally alternate, reduced; leaflets 4–80 per side, generally overlapped, generally divided ± to base. Inflorescence: cyme; pedicel bractlets 0. Flower: receptacle generally not stalked; hypanthium shallow or deep, bractlets (0)5, generally < sepals; petals generally 5, 1–5(7) mm, linear to obovate or round, acute to rounded; stamens 5–20(40), filaments generally thread-like; pistils 1–8(20), ovary superior, style attached below fruit tip, base ± rough-thickened. Fruit: achene.
30 species: western North America. (Eli Ives, Yale University, Connecticut pharmacologist, 1779–1861) [Ertter & Reveal 2007 Novon 17:315–325] Leaf, leaflet data for basal leaves.
Unabridged etymology: (Eli Ives, Yale University, Connecticut pharmacologist, participant in Pacific Railroad Survey, 1779–1861)
Unabridged references: [Ertter 1989 Syst Bot 14:231–244]

Key to Ivesia

I. pygmaea A. Gray
NATIVE
Plant ± matted, green; caudex branched. Stem: decumbent to erect, generally 3–15 cm. Leaf: 1–10 cm; sheathing bases generally ± strigose; leaflets generally 10–15 per side, lobes generally 5–8, generally 1–3 mm, ± widely oblanceolate; cauline leaf 1. Inflorescence: dense to ± open, 8–30 mm wide, generally 5–10-flowered; pedicels 2–10 mm, straight. Flower: 9–11 mm wide; hypanthium length ± < 1/2 width; petals 2–4 mm, <= sepals, widely oblanceolate, yellow; stamens 10; pistils 10–30. Fruit: 1–1.5 mm, smooth, pale.
Rocky (granitic) places; 2700–4000 m. c&s High Sierra Nevada. Jul–Sep [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 23 2014
Citation for this treatment: [Author of taxon treatment] 2012. Ivesia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=29458, accessed on Apr 23 2014

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Bioregions in which Ivesia pygmaea occurs 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.
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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.