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Micranthes howellii
HOWELL'S SAXIFRAGE

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

Micranthes howellii (Greene) Small
NATIVE
Habit: Plant 5--20 cm; caudex slender, generally producing short rhizomes; bulblets 0. Leaf: 2--6 cm; petiole 1--4 cm; blade oblong to ovate, base tapered, teeth coarse, round or sharp. Inflorescence: open to dense; flowers 5--15. Flower: sepals reflexed, < petals, elliptic to ovate; petals 2.5--4.5 mm, +- obovate; filaments inflated proximally; pistils 2, ovary superior. Fruit: 2 follicles.
Ecology: Moist ledges, crevices; Elevation: < 900 m. Bioregional Distribution: KR; Distribution Outside California: southwestern Oregon. Flowering Time: Feb--Apr
Synonyms: Saxifraga howellii Greene
eFlora Treatment Author: Michael S. Park
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

Previous taxon: Micranthes fragosa
Next taxon: Micranthes integrifolia

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Citation for this treatment: Michael S. Park 2016. Micranthes howellii, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91946, accessed on May 01, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 01, 2016.


Micranthes howellii
click for enlargement
© 2013 Dana York
Micranthes howellii
click for enlargement
© 2013 Dana York
Micranthes howellii
click for enlargement
© 2013 Dana York
Micranthes howellii
click for enlargement
© 2013 Dana York
Micranthes howellii
click for enlargement
© 2013 Dana York

More photos of Micranthes howellii in CalPhotos


Geographic subdivisions for Micranthes howellii:
KR;
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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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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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.