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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, , 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.
± 30 genera, 600 species: especially northern temperate, arctic, alpine; some cultivated (Bergenia, Darmera, Heuchera, Saxifraga, Tellima, Tolmiea). [Soltis et al. 2001 Ann Missouri Bot Gard 88:669–693; Okuyama et al. 2008 Molec Phylogen Evol 46:560–575] California Mitella moved to Mitellastra, Ozomelis, Pectiantia; Suksdorfia ranunculifolia to Hemieva. Parnassia moved to Parnassiaceae. —Scientific Editor: Bruce G. Baldwin.
Unabridged references: [Soltis 1988 Syst Bot 13:64–72]
Key to Saxifragaceae
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.Key to Heuchera
50 species: North America. (J.H. von Heucher, German professor of medicine, 1677–1747) Highly variable; needs study.
Unabridged references: [Rosendahl et al. 1936 Minnesota Stud Plant Sci 2:1–180]
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.
2n=14,28. Moist, rocky banks and cliffs; < 2500 m. Northwestern California, High Cascade Range, High Sierra Nevada, Central Western California (except Inner South Coast Ranges); to British Columbia, Idaho. [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] Highly variable; many intergrading varieties historically recognized. Intergrades with Heuchera pilosissima. Apr–Jul [Online Interchange]
Unabridged note: Expanded author citation: Heuchera micrantha Douglas ex Lindl.
Previous taxon: Heuchera merriamii
Next taxon: Heuchera parishii
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 28 2015
Citation for this treatment: [Author of taxon treatment] 2013. Heuchera, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=28126, accessed on May 28 2015
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|Geographic subdivisions indicated for the distribution of Heuchera micrantha|| 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.
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(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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