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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
Plant generally ± hairy, often glandular; caudex or rhizome generally not woody, generally scaly. Leaf: basal (cauline); blade linear to (ob)ovate or ± round, base tapered to reniform, margin entire or toothed. Inflorescence: flowers few to many; bracts scale-like. Flower: generally radial; hypanthium free or ± fused to ovary; petals 5, white, sometimes with yellow spots at base; stamens 10, filaments flat or variously inflated; pistils 1 (chambers 2, placentas 2, axile or occasionally proximally axile and distally marginal) or 2, ovary superior to ± inferior (sometimes more superior in fruit), styles free throughout. Fruit: capsule or 2 follicles.Key to Micranthes
± 80 species: North America, Eurasia, South America, especially cool temperate northern hemisphere. (Latin: small flower) [Elvander 1984 Syst Bot Monogr 3:1–44] Intermediates common between Micranthes integrifolia, Micranthes nidifica, Micranthes fragosa, Micranthes aprica; some may be vegetatively reproducing, sterile hybrids. Study needed.
Unabridged references: [Small & Rydberg 1905 N Am Fl 22:132–150]
Plant 10–50 cm; caudex with rhizomes and generally bulblets. Leaf: 3–10 cm; petiole 1.5–5 cm; blade ovate, base generally tapered, entire or minutely toothed. Inflorescence: generally open between ± head-like clusters. Flower: sepals ± reflexed, <= petals, triangular to ovate; petals 1–2 mm, narrowly elliptic to round; filaments ± flat, narrowed near tip; nectaries disk-like, lobed; pistils 2, ovary > 1/2-inferior in flower. Fruit: 2 follicles.
2n=38. Open wet meadows, slopes; (1000)1800–3500 m. Klamath Ranges, Outer North Coast Ranges (Buck Mtn, Humboldt Co.), High Sierra Nevada, Modoc Plateau; to British Columbia, Montana, Nevada. [Saxifraga nidifica Greene var. nidifica] Variable. Intergrades with Micranthes integrifolia and Micranthes fragosa in Klamath Ranges, Cascade Range, Modoc Plateau. Plants in High Sierra Nevada with open inflorescence that are similar to Micranthes californica and Micranthes fragosa may be distinct (Micranthes montana Small). May–Aug [Online Interchange]
Previous taxon: Micranthes marshallii
Next taxon: Micranthes odontoloma
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 24 2015
Citation for this treatment: [Author of taxon treatment] 2013. Micranthes, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91948, accessed on Nov 24 2015
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|Geographic subdivisions indicated for the distribution of Micranthes nidifica|| 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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