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Mountain Pseudosaxifrage

Micranthes occidentalis (S. Wats.) Small

Comprehensive Description

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Micranthes occidentalis (S. Wats.) Small
Saxifraga occidentalis S. Wats. Proc. Am. Acad. 23 : 264. 1888.
Leaves spreading, 2-6.5 cm. long, the blades ovate to oblong or oval, dentate or crenate-dentate, abruptly narrowed and cuneate at the base, usually minutely pubescent beneath, sometimes closely so when young ; scapes 4-19 cm. tall, often purplish, copiously glandular-pubescent, very densely so above, narrowly paniculate, or somewhat corymbose at the top, the peduncles and pedicels relatively short during anthesis, somewhat elongated at maturity; sepals ovate, 1.5-2 mm. long, obtuse, occasionally sparingly ciliolate, reflexed; petals white, 2-3.5 mm. long, rounded at the apex, the blades oval to oval-ovate, rather abruptly narrowed into short claw-like bases ; filaments clavate ; follicles about 2 mm. high, purple, the short tips widely spreading.
Type locality : Rocky Mountains. Distribution : Alberta to Montana.
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bibliographic citation
John Kunkel SmaII, Per Axel Rydber, Nathaniel Lord Britton, Percy Wilson, Henry Hurd Rusby. 1905. ROSALES, PODOSTEMONACEAE, CRASSULACEAE, PENTHORACEAE and PARNASSIACEAE. North American flora. vol 22(2). New York Botanical Garden, New York, NY
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Comprehensive Description

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Micranthes lata Small, sp. nov
Leaves spreading, 3-5.5 cm. long, the blades ovate to oblong-ovate, ciliolate, crenate or crenate-dentate, finely pubescent on both sides, glabrate in age, narrowed into petioles that are usually shorter than the blades; scapes 14-23 cm. tall, glandular-pubescent especially above, paniculately branched, the peduncles and pedicels elongated ; cymules few-flowered, open; sepals ovate, about 1.5 mm. long, mainly glabrous, reflexed; petals white, orbicular or broader than long, rounded at the base with no indication of a claw; filaments clavate ; follicles 2-2.5 mm. high, purple, the stout tips spreading.
Type collected at Lytton, British Columbia, April 16, 1889, by John Macoun. Distribution : British Columbia to California.
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bibliographic citation
John Kunkel SmaII, Per Axel Rydber, Nathaniel Lord Britton, Percy Wilson, Henry Hurd Rusby. 1905. ROSALES, PODOSTEMONACEAE, CRASSULACEAE, PENTHORACEAE and PARNASSIACEAE. North American flora. vol 22(2). New York Botanical Garden, New York, NY
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Comprehensive Description

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Micranthes allenii Small, sp. nov
Leaves spreading or somewhat ascending, 1.5-7.5 cm. long, the blades typically ovate, sometimes broadly so or orbicular-ovate, occasionally oblong-ovate, crenate, sparingly lanuginous beneath, the hairs partially deciduous in age ; scapes 6-21 cm. tall, glandular-pubescent throughout but more densely so above, corymbosely paniculate, the cymules commonly few-flowered, the lower peduncles elongated in age ; sepals ovate, sometimes sparingly ciliolate, 1.5-3 mm. long, reflexed; petals white, 3-3.5 mm. long, notched at the apex, the blades oval to obovate, narrowed into broad claw-like bases ; filaments clavate ; follicles about 3 mm. high, purple, the rather long tips widely spreading.
Type collected on Goat Mountains, Washington, June 27, 1896, by O. D. Allen, no. 242. Distribution : Washington.
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bibliographic citation
John Kunkel SmaII, Per Axel Rydber, Nathaniel Lord Britton, Percy Wilson, Henry Hurd Rusby. 1905. ROSALES, PODOSTEMONACEAE, CRASSULACEAE, PENTHORACEAE and PARNASSIACEAE. North American flora. vol 22(2). New York Botanical Garden, New York, NY
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Comprehensive Description

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Micranthes saximontana (B. Nelson) Small
Saxifraga saximontana H. Nelson, Krythea 7 : 168. 1899. Saxifraga idahoensis Piper, Bull. Torrey Club 27 : 394. 1900.
Leaves spreading, 3-9 cm. long, the blades typically ovate, varying to oblong-ovate or occasionally oblong, dentate or crenate, sparingly pubescent, at least when young, commonly glabrous at maturity, except the margins, the petiole-like bases commonly about as long as the blades; scapes 9-19 cm. tall, glandular-pubescent throughout, commonly more densely so above, rather corymbosely branched, the peduncles and pedicels elongated; cymules fewflowered, lax; sepals ovate to oblong-ovate, 1.5-2 mm. long, sometimes ciliolate, reflexed; petals white, 2-3 mm. long, the blades oval to ovate or sometimes slightly broadest above the middle, rounded at the apex, narrowed into short claw-like bases; filaments clavate; follicles about 3 mm. high, the short slender tips ascending or spreading.
Type locality : Sundance, Wyoming. Distribution : Montana, Idaho and Wyoming.
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bibliographic citation
John Kunkel SmaII, Per Axel Rydber, Nathaniel Lord Britton, Percy Wilson, Henry Hurd Rusby. 1905. ROSALES, PODOSTEMONACEAE, CRASSULACEAE, PENTHORACEAE and PARNASSIACEAE. North American flora. vol 22(2). New York Botanical Garden, New York, NY
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Micranthes occidentalis

provided by wikipedia EN

Micranthes occidentalis, commonly known as western saxifrage, is a species of flowering plant native to North America..[1][2][3]

Description

Micranthes occidentalis is an herbaceous perennial, with three to five petoliate leaves in a rosette pattern at the base of the plant. Leaves are elliptic to oval, 3-8 cm long and 1-3 cm wide, with 15-30 teeth. Flowering stems, growing 10-25 cm tall, are leafless, glandular-hairy, and reddish in color[4]

In May through August, stems grow clusters of small white or pinkish flowers, which are calyx cup-shaped. Flowers are five-lobed, each petal about 5 mm long, and stamens 10 mm. The inflorescence is glandular and pyramidal. Mature fruits are green to reddish-purple capsules 3-6 mm long.

Like many saxifrages, M. occidentalis forms several short rhizomes, and roots may grow bulblets.

Micranthes occidentalis can be distinguished from the closely-related M. rufidula by its comparatively irregular tooth pattern, non-hairy leaves, and glandular (rather than flat) inflorescence.

Naming

Genus Micranthes was previously grouped under Saxifraga, and many sources still refer to Micranthes occidentalis as Saxifraga occidentalis.

Micranthes occidentalis is also known as mountain saxifrage and redwool saxifrage,[5] though the latter name is more commonly used for the closely-related M. rufidula.

Distribution

Occurring from New Mexico to as far north as Alaska and as far east as Montana,[6] M. occidentalis is common in a variety of ecological conditions, including rocky slopes, meadows, and mossy openings. While it can be found in altitudes ranging from valleys to alpine, some accounts consider M. occidentalis to prefer higher altitudes, contributing to the common name "mountain saxifrage".

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Micranthes occidentalis: Brief Summary

provided by wikipedia EN

Micranthes occidentalis, commonly known as western saxifrage, is a species of flowering plant native to North America..

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