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; glands inconspicuous
Stem ascending to erect
Leaves generally basal, odd-1-pinnate; leaflets lobed, unevenly toothed, often alternately large and small
Inflorescence: generally cyme, open
Flower: hypanthium shallow; bractlets generally 5; sepals 5; petals 5; stamens > 20; pistils many, ovaries superior, continuous to style at top
Fruit: achene ± flat; style long, persistent
Species in genus: 40–50 species: generally n temp, arctic
Etymology: (Latin: ancient name)


G. triflorum Pursh


Plant in patches, rhizomed, ± gray-green
Stem generally 20–50 cm
Leaf generally 5–20 cm; leaflets wedge-shaped, generally 2–3-lobed ± 1/2 to base, lobes deeply few-toothed, main leaflets 3–6 per side, largest 1–3 cm, ± = terminal leaflet
Inflorescence 1–3-flowered; pedicels curved (straight in fruit)
Flower ± cup-shaped; bractlets 5–14 mm, linear-oblanceolate; sepals erect, 6–12 mm; petals 7–13 mm, ± elliptic, outcurved, cream or pink-tinged, persistent
Fruit: achene body 2.5–5 mm; style < 35 mm including generally persistent tip, not hooked, plumose
Chromosomes: n=21
Ecology: Dry meadow edges, sagebrush scrub, open yellow-pine forest
Elevation: 1300–3200 m.
Bioregional distribution: c Klamath Ranges (Marble Mtns), High Cascade Range, n&c High Sierra Nevada, Great Basin Floristic Province
Distribution outside California: to n&e N.America
Flowering time: May–Jul
Synonyms: G. canescens (Greene) Munz; G. ciliatum Pursh
Varieties indistinct in CA
Horticultural information: 1, 2, 6 IRR: 3, 7, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24; GRCVR.

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bioregional map for GEUM%20triflorum 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 Geum triflorum
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