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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Patrick E. Elvander

Perennial or subshrub from caudex or rhizome, generally ± hairy
Stem often ± leafy on lower half, rarely trailing and leafy throughout
Leaves generally simple, basal or sometimes cauline, generally alternate, generally petioled; veins ± palmate
Inflorescence: panicle, generally ± scapose
Flower generally bisexual, generally radial; hypanthium free to ± fused to ovary; calyx lobes generally 5; petals generally 5, free, generally clawed, generally white; stamens generally 5 or 10; pistils 2 and simple or 1 and compound (chambers 1–2, placentas 2–4, axile or parietal), ovary superior to inferior, sometimes more superior in fruit, styles generally 2
Fruit: 2 follicles or 2–4-valved capsule
Seeds generally many, small
Genera in family: 40 genera, 600 species: especially n temp, arctic, alpine; some cultivated (Bergenia , Darmera , Heuchera , Saxifraga , Tellima , Tolmiea )
Reference: [Soltis 1988 Syst Bot 13:64–72]



Plant hairy; glands few; rhizome scaly; bulblets 0
Leaves simple or compound, basal and cauline, reduced upward; stipules minute on cauline leaves, membranous, with marginal bristles; blade ovate, base cordate, lobes 3–5, ± deep, or leaflets 3, teeth sharp
Inflorescence generally raceme-like
Flower: hypanthium minute, free of ovary; petals thread-like; stamens 10; pistil 1, ovary superior, chamber 1 below, 2 above, placentas 2, parietal
Fruit: capsule; valves 2, unequal
Species in genus: 2 species: North America, Asia
Etymology: (Greek: small tiara)
Reference: [Kern 1966 Madroño 18:152–160]


T. trifoliata L.


Leaf 2–20 cm; stipules on basal leaves < 1 cm, on cauline leaves < 1 mm; petiole > blade; blade 3–12 cm wide, teeth sharp
Inflorescence 15–40 cm; glandular hairs dense
Flower: calyx lobes 1.5–2.5 mm; petals 3–4 mm
Ecology: UNCOMMON. Moist shady banks
Elevation: < 2500 m.
Bioregional distribution: Northwestern California, n Central Coast, San Francisco Bay Area
Distribution outside California: to Alaska, Montana
Varieties intergrade.


var. unifoliata (Hook.) Kurtz

Leaf generally 9–12 cm wide; lobes ± deep, teeth generally round, tips sharp
Chromosomes: 2n=14
Ecology: Habitat and range of sp
Bioregional distribution: Northwestern California, n Central Coast, San Francisco Bay Area
Synonyms: T. u. Hook
Horticultural information: IRR, DRN: 4, 5, 17 &SHD: 1, 2, 3, 6, 7, 14, 15, 16; GRCVR.

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bioregional map for TIARELLA%20trifoliata%20var.%20unifoliata 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 Tiarella trifoliata var. unifoliata
Retrieve dichotomous key for Tiarella
Overlay Consortium of California Herbaria specimen data by county on this map
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