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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. aperta (J.T. Howell) Munz
NATIVE
Plant tufted, ± green or white-hairy; caudex 0–few-branched. Stem: 15–45 cm. Leaf: 10–20 cm; sheathing bases densely strigose; leaflets 20–35 per side, lobes < 5, 3–15 mm, elliptic to oblanceolate; cauline leaves 3–8. Inflorescence: open; clusters many, ± head-like, 10–20 mm wide; pedicels generally < 3 mm (except lowest), straight. Flower: 5–15 mm wide; hypanthium length <= width; petals < to > sepals, yellow; stamens generally 20; pistils 2–7. Fruit: 2–3 mm, smooth, brown. [Online Interchange]

I. aperta var. aperta SIERRA VALLEY IVESIA
NATIVE
Stem: generally ascending to erect. Inflorescence: clusters generally > 10-flowered. Flower: hypanthium 2–3 mm wide; petals 2–3 mm, oblanceolate; filaments 1–1.5 mm; style ± 2.5 mm.
Dry, rocky meadows, generally volcanic soils; 1500–2300 m. n High Sierra Nevada (except Dog Valley), s Modoc Plateau; western Nevada. Jun–Aug [Online Interchange] {CNPS list}
Unabridged note: With Ivesia sericoleuca near Beckwith, Sierra Valley.

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 2 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=60272, accessed on Sep 2 2014

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click for enlargement Ivesia aperta var. aperta
See CalPhotos for additional images
© 2001 Dean Wm. Taylor

Geographic subdivisions indicated for the distribution of Ivesia aperta var. aperta 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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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.