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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

HORKELIA

Barbara Ertter

Perennial herb, generally ± glandular, generally resinous-smelling; caudex generally branched. Stem: generally ascending to erect. Leaf: generally basal, odd-1-pinnately compound, generally ± flat; cauline alternate, reduced upward; leaflets 2–15 per side, uppermost lateral generally ± fused with terminal. Inflorescence: cyme; pedicels generally straight, bractlets 0. Flower: hypanthium cup-like, ± flat-bottomed, width ± 2 × length, bractlets 5, generally 2/3 sepals; sepals often reflexed; petals generally ± = sepal, blunt, white; stamens 10, filaments ± flat, often forming a tube; pistils 2–many, ovary superior, style attached below fruit tip, ± thicker at base. Fruit: achene.
20 species: western North America. (J. Horkel, German plant physiologist, 1769–1846) [Ertter & Reveal 2007 Novon 17:315–325] Many attractive to bees; data apply to basal leaves, pressed hypanthia.

Key to Horkelia

H. fusca Lindl.
NATIVE
Plant generally tufted (± matted), green to ± gray. Stem: generally 10–60 cm. Leaf: stipules entire. Inflorescence: clusters 1–several, generally ± head-like; pedicels generally 1–3 mm. Flower: hypanthium width generally 2–3.5 mm, ± 1–2 × length, bractlets < 0.5 mm wide, linear; sepals generally 2–3 mm; petals ± wedge-shaped; filament base 0.2–1 mm wide; pistils generally 10–20. [Online Interchange]
Unabridged note: Other varieties in Oregon, Washington.

H. fusca var. parviflora (Hook. & Arn.) Wawra
NATIVE
Leaf: generally 4–15 cm; leaflets generally 4–8 per side, separated, generally 5–15 mm, wedge-shaped to round, ± 5-toothed 1/4–1/2 to base, hairs sparse to dense, green. Inflorescence: clusters generally 5–20-flowered. Flower: petals 2–4 mm; filaments 0.2–1 mm, generally longer than wide, anthers ± 0.4 mm; style ± 1 mm. Fruit: ± 1.2 mm.
n=14. Dry meadow edges, open forest, volcanic or granitic soils; 1400–3300 m. eastern Klamath Ranges, High Sierra Nevada, n East of Sierra Nevada; to Oregon, Wyoming. [Horkelia fusca subsp. parviflora (Hook. & Arn.) D.D. Keck] Plants in Klamath Ranges/Oregon, ID/Wyoming probably distinct. Jun–Sep [Online Interchange]
Unabridged synonyms: [Horkelia fusca subsp. parviflora (Nutt. ex Hook. & Arn.) D.D. Keck]
Unabridged note: Expanded author citation: Horkelia fusca var. parviflora (Nutt. ex Hook. & Arn.) Wawra

Previous taxon: Horkelia fusca var. brownii
Next taxon: Horkelia fusca var. pseudocapitata

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 24 2014
Citation for this treatment: [Author of taxon treatment] 2013. Horkelia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=60066, accessed on Nov 24 2014

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Geographic subdivisions indicated for the distribution of Horkelia fusca var. parviflora 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.