Jepson eFlora: Taxon page
Vascular Plants of California
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Heuchera micrantha

Higher Taxonomy
Family: SaxifragaceaeView DescriptionDichotomous Key
Habit: Perennial herb from caudex or rhizome, generally +- hairy. Stem: often +- leafy on proximal 1/2, rarely trailing and leafy throughout. Leaf: generally simple, basal and/or cauline, generally alternate, generally petioled; veins +- palmate. Inflorescence: raceme or 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 3, [4], 5, 8, or 10; pistils 1 (carpels +- fused, ovary lobed, chambers 1 or 2, placentas generally 2(3), axile or parietal or occasionally proximally axile and distally marginal in ovary lobes) or 2 (carpels free, placentas marginal), ovary nearly superior to inferior, occasionally more superior in fruit, styles generally 2(3). Fruit: capsule (generally 2(3)-beaked, valves generally 2(3), generally equal) or 2 follicles. Seed: generally many, small.
Genera In Family: +- 30 genera, 600 species: especially northern temperate, arctic, alpine; some cultivated (Bergenia, Darmera, Heuchera, Saxifraga, Tellima, Tolmiea). Note: California Mitella moved to Mitellastra, Ozomelis, Pectiantia; Suksdorfia ranunculifolia to Hemieva. Parnassia moved to Parnassiaceae.
eFlora Treatment Author: Michael S. Park & Patrick E. Elvander, except as noted
Scientific Editor: Bruce G. Baldwin.
Genus: HeucheraView DescriptionDichotomous Key

Common Name: ALUMROOT
Habit: Rhizome scaly; bulblets 0. Leaf: basal, sometimes a few cauline; blade ovate, base cordate to reniform, lobes and teeth generally shallow, irregular. Inflorescence: panicle, often spike- or raceme-like; bracts generally scale-like. Flower: radial or +- bilateral; hypanthium partly fused to ovary; calyx lobes equal or not; petals 0 or 5, generally equal, clawed, generally white; stamens 5, generally equal; pistil 1, ovary > 1/2-inferior, chamber 1, placentas 2, parietal. Fruit: capsule. Seed: red-brown, minutely spiny.
Species In Genus: 50 species: North America. Etymology: (J.H. von Heucher, German professor of medicine, 1677--1747) Note: Highly variable; needs study.
eFlora Treatment Author: Michael S. Park
Unabridged Reference: Rosendahl et al. 1936 Minnesota Stud Pl Sci 2:1--180
Heuchera micrantha Douglas ex Lindl.
Habit: Plant 10--100 cm. Leaf: petiole 3--30 cm, generally glandular; blade 2--12 cm, broadly ovate to oblong, 5--7-lobed, generally hairy. Inflorescence: wide to narrow, open, glandular; bracts on peduncle few, small, leaf-like. Flower: radial; hypanthium + calyx 1.5--3(5) mm; part of hypanthium fused to ovary 0.5--2.5 mm, generally > free part; calyx lobes 0.5--1.5 mm, tips green to red; petals 2--3 mm, oblanceolate, claw < blade, sometimes +- pink; stamens > calyx lobes, exserted; mature styles 2--4 mm, exserted. Chromosomes: 2n=14,28.
Ecology: Moist, rocky banks and cliffs; Elevation: < 2500 m. Bioregional Distribution: NW, CaRH, SNH, CW (exc SCoRI); Distribution Outside California: to British Columbia, Idaho. Flowering Time: Apr--Jul Note: Highly variable; many intergrading varieties historically recognized. Intergrades with Heuchera pilosissima.
Synonyms: Heuchera micrantha var. diversifolia (Rydb.) Rosend. et al.; Heuchera micrantha var. erubescens (A. Braun & Bouché) Rosend.; Heuchera micrantha var. hartwegii (Wheelock) Rosend.; Heuchera micrantha var. macropetala Shipes & E.F. Wells
Jepson eFlora Author: Michael S. Park
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Botanical illustration including Heuchera micrantha

botanical illustration including Heuchera micrantha


Citation for this treatment: Michael S. Park 2012, Heuchera micrantha, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 23, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora,, accessed on October 23, 2019.

Heuchera micrantha
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© 2010 George W. Hartwell
Heuchera micrantha
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© 2006 George W. Hartwell
Heuchera micrantha
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© 2014 Julie Kierstead Nelson
Heuchera micrantha
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© 2014 Julie Kierstead Nelson
Heuchera micrantha
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© 2009 Keir Morse
Heuchera micrantha
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© 2014 Julie Kierstead Nelson

More photos of Heuchera micrantha in CalPhotos

Geographic subdivisions for Heuchera micrantha:
NW, CaRH, SNH, CW (exc SCoRI)
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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.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.