Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Annual to tree
Leaves simple to pinnately to palmately compound, generally alternate; stipules free to fused, persistent to deciduous
Inflorescence: cyme, raceme, panicle, or flowers solitary
Flower generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, often with bractlets alternate with sepals; sepals generally 5; petals generally 5, free; stamens (0)5–many, pistils (0)1–many, simple or compound; ovary superior to inferior, styles 1–5
Fruit: achene, follicle, drupe, pome, or blackberry- to raspberry-like
Seeds generally 1–5
Genera in family: 110 genera, ± 3000 species: worldwide, especially temp. Many cultivated for ornamental and fruit, especially Cotoneaster , Fragaria , Malus , Prunus , Pyracantha, Rosa , and Rubus
Reference: [Robertson 1974 J Arnold Arbor 55:303–332,344–401,611–662]
Family description, key to genera by Barbara Ertter and Dieter H. Wilken.


Barbara Ertter

Perennial, generally ± glandular, generally resinous-smelling; caudex generally branched
Stem generally ascending to erect
Leaves generally basal, odd-1-pinnate, generally ± flat; cauline alternate, reduced upward; uppermost lateral leaflets generally ± fused with terminal
Inflorescence: cyme, open or of dense clusters; pedicels generally straight
Flower: hypanthium a ± flat-bottomed cup, width ± 2 X length; bractlets 5, generally 2/3 sepals; sepals 5, often reflexed; petals 5, generally ± = sepals, blunt, white; stamens 10, filaments flat, often forming a tube; pistils 2–many, ovaries superior, styles jointed below fruit tip, ± thicker at base
Fruit: achene
Species in genus: 19 species: w North America
Etymology: (J. Horkel, German plant physiologist, 1769–1846)
Data apply to basal leaves, pressed hypanthia.


H. fusca Lindl.

Plant generally tufted (± matted), green to grayish
Stem generally 10–60 cm
Leaf generally 4–15 cm; leaflets 3–15 per side, separated to ± crowded, generally 4–20 mm, narrowly wedge-shaped to ± round, ± 5–10-toothed to lobed, hairs sparse to dense
Inflorescence: clusters 1–several, generally ± head-like, generally 5–30-flowered; pedicels generally 1–3 mm
Flower: hypanthium width generally 2–3.5 mm, ± 1–2 X length; bractlets < 0.5 mm wide, linear; sepals generally 2–3 mm; petals 2–6 mm, ± wedge-shaped; filaments 0.1–1.5 mm, bases 0.2–1 mm wide, anthers generally ± 0.5 mm; pistils generally 10–20, styles 0.8–1.5 mm
Fruit 1–1.8 mm
Ecology: Dry meadow edges, open forest, volcanic or granitic soils
Elevation: 1000–3300 m.
Bioregional distribution: e Klamath Ranges, High Cascade Range, High Sierra Nevada, Modoc Plateau, n East of Sierra Nevada
Distribution outside California: to Washington, Wyoming, Nevada
Sspp. need study


subsp. parviflora (Nutt.) D.D. Keck

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
Inflorescence: clusters generally 5–20-flowered
Flower: petals 2–4 mm; filaments 0.2–1 mm, generally longer than wide, anthers ± 0.4 mm; styles ± 1 mm
Fruit ± 1.2 mm
Chromosomes: n=14
Ecology: Habitats of sp.
Elevation: 1000–3300 m.
Bioregional distribution: e Klamath Ranges, n High Cascade Range, High Sierra Nevada, Modoc Plateau (except Warner Mountains), n East of Sierra Nevada
Distribution outside California: to Oregon, Idaho, Nevada
Flowering time: Jul–Aug
Synonyms: subsp. pseudocapitata (Rydb.) D.D. Keck
Horticultural information: DRN, IRR: 1, 2, 3, 4, 5, 6, 7, 15, 16, 17, 18; DFCLT.

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bioregional map for HORKELIA%20fusca%20subsp.%20parviflora being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Horkelia fusca subsp. parviflora
Retrieve dichotomous key for Horkelia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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