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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

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
eFlora Treatment Author: Michael S. Park
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botanical illustration including Heuchera micrantha


Citation for this treatment: Michael S. Park 2016. Heuchera micrantha, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 05, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 05, 2016.

Heuchera micrantha
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© 2010 Barry Breckling
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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© 2010 George W. Hartwell
Heuchera micrantha
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© 2014 Julie Kierstead Nelson
Heuchera micrantha
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© 2008 Steve Matson

More photos of Heuchera micrantha in CalPhotos

Geographic subdivisions for Heuchera micrantha:
NW, CaRH, SNH, CW (exc SCoRI);
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.
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).

View elevation by latitude chart
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.