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Vascular Plants of California
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Micranthes fragosa


Higher Taxonomy
Family: SaxifragaceaeView DescriptionDichotomous Key
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.
Genus: MicranthesView DescriptionDichotomous Key


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.
Species In Genus: +- 80 species: North America, Eurasia, South America, especially cool temperate northern hemisphere. 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 fragosa (Suksd. ex Small) Small
NATIVE
Habit: Plant 15--35 cm; caudex generally with rhizomes and bulblets. Leaf: 4--11 cm; petiole 2--5 cm; blade triangular to ovate, base tapered, entire to minutely toothed. Inflorescence: open to +- congested at tips, branches spreading to ascending; pedicel densely glandular. Flower: sepals +- reflexed to spreading, < petals; petals 2--3 mm, obovate; filaments +- flat, narrowed near tip; nectaries disk-like, lobed; pistils 2, ovary >> 1/2-inferior in flower. Fruit: 2 follicles. Chromosomes: 2n=20,38.
Ecology: Moist, rocky slopes and outcrops; Elevation: 500--2000 m. Bioregional Distribution: KR, CaR, MP (exc Wrn). Flowering Time: Mar--Jun Note: Intermediate between Micranthes californica and Micranthes integrifolia. Plants with 2n=38 chromosomes possibly best treated as variant of Micranthes integrifolia.
Synonyms: Saxifraga nidifica Greene var. claytoniifolia (Canby ex Small) Elvander
Jepson eFlora Author: Michael S. Park
Reference: Elvander 1984 Syst Bot Monogr 3:1--44
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Citation for this treatment: Michael S. Park 2012, Micranthes fragosa, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=91945, accessed on October 19, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on October 19, 2019.

Micranthes fragosa
click for enlargement
© 2019 Dana York
Micranthes fragosa
click for enlargement
© 2019 Dana York
Micranthes fragosa
click for enlargement
© 2019 Dana York
Micranthes fragosa
click for enlargement
© 2019 Dana York
Micranthes fragosa
click for enlargement
© 2019 Dana York

More photos of Micranthes fragosa in CalPhotos



Geographic subdivisions for Micranthes fragosa:
KR, CaR, MP (exc Wrn).
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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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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.