Common Name: SAXIFRAGE FAMILY 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.
Common Name: SAXIFRAGE Habit: 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. Etymology: (Latin: small flower) Note: Intermediates common between Micranthes integrifolia, Micranthes nidifica, Micranthes fragosa, Micranthes aprica; some may be vegetatively reproducing, sterile hybrids. Study needed. eFlora Treatment Author: Michael S. Park Reference: Elvander 1984 Syst Bot Monogr 3:1--44 Unabridged Reference: Small & Rydberg 1905 N Am Fl 22:132--150
Micranthes oregana (Howell) Small
NATIVE Habit: Plants 25--125 cm; caudex > 15 cm, thick, fleshy, sometimes branched; bulblets 0. Leaf: 7--25 cm; petiole +- indistinct; blade linear to oblanceolate, base tapered, entire or sharp-toothed. Inflorescence: dense toward tips of main axis and branches, otherwise open. Flower: sepals reflexed, generally < petals, ovate to triangular; petals 2--4 mm, linear to elliptic; filaments +- flat, narrowed at tip; nectaries disk-like, lobed; pistils 2, ovary > 1/2-inferior in flower. Fruit: 2 follicles. Chromosomes: 2n=38,76. Ecology: Bogs, marshes, lake margins; Elevation: 1000--2500 m. Bioregional Distribution: KR, CaRH, SN, MP; Distribution Outside California: to Washington, Idaho, Nevada. Flowering Time: Jun--Aug Note: Leaves and inflorescence variable, but habitat distinctive. Like Micranthes pensylvanica (L.) Haw. of eastern United States. Synonyms: Saxifraga oregana Howell Jepson eFlora Author: Michael S. Park Reference: Elvander 1984 Syst Bot Monogr 3:1--44 Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Previous taxon: Micranthes odontoloma Next taxon: Micranthes tolmiei
Citation for this treatment: Michael S. Park 2012, Micranthes oregana, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=33448, accessed on February 06, 2025.
Citation for the whole project: Jepson Flora Project (eds.) 2025, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on February 06, 2025.
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