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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. gordonii (Hook.) Torr. & A. Gray
NATIVE
Plant tufted, green; caudex ± branched. Stem: 5–20 cm. Leaf: generally 3–8 cm; sheathing bases ± glandular; leaflets generally 10–16 per side, overlapped but distinct, lobes 4–8, generally 2–5 mm, oblanceolate to obovate; cauline leaf generally 1. Inflorescence: cluster generally 1, generally head-like, 10–30 mm wide, 10–20-flowered; pedicels generally < 3 mm, straight. Flower: 5–9 mm wide; hypanthium length >= width; petals 2–3 mm, <= sepals, narrow-oblanceolate, yellow; stamens 5; pistils generally 2–4. Fruit: ± 2 mm, ± smooth, mottled brown. Varieties tentatively distinct in California. [Online Interchange]
Unabridged note: Other varieties from eastern Idaho and Utah to Montana, Wyoming, Colorado.

I. gordonii var. ursinorum (Jeps.) Ertter & Reveal
NATIVE
Stem: prostrate to ascending, dark ± red. Flower: anthers red-margined.
Open, dry, rocky ridges, slopes; 1800–3500 m. Klamath Ranges (Scott Mtns, Mount Eddy), n&c High Sierra Nevada (Sonora Pass, Alpine, Tuolumne cos.), Warner Mountains, East of Sierra Nevada (Sweetwater Mtns); to Idaho, Nevada. Jun–Aug [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 Jul 31 2014
Citation for this treatment: [Author of taxon treatment] 2013. Ivesia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=81852, accessed on Jul 31 2014

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Bioregions in which Ivesia gordonii var. ursinorum 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.