Comments
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The circumscription and diagnosis of Lewisia pygmaea is problematic because of morphologic variability, intermediacy, and/or hybridization with L. nevadensis (see L. T. Dempster 1990). In the range of typical forms of L. nevadensis (see discussion under 11. L. nevadensis), one or more forms of L. pygmaea will also occur, but at higher elevations. Segregates of L. pygmaea recognized elsewhere as species include L. glandulosa, which occurs in rocky substrates above 3000 m in the central and southern Sierra Nevada and is characterized by elongate, sinuous taproots (L. T. Dempster 1990); and L. sierrae, which occurs in moist flats above 2400 m in the central Sierra Nevada and includes diminutive plants with irregularly eglandular-toothed (occasionally entire) sepals (B. Mathew 1989b). Dempster postulated that the variable and widely distributed L. pygmaea represents a hybrid species derived from L. nevadensis and L. glandulosa.
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Description
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Taproots gradually ramified distally or shortly fusiform, rarely subnapiform. Stems ± prostrate or suberect, becoming reflexed in fruit, 1-6 cm. Leaves: basal leaves withering at or soon after anthesis, ± sessile or gradually tapered to long petiole, blade linear to linear-oblanceolate, ± flattened, 3-9 cm, margins entire, apex acute to obtuse; cauline leaves absent. Inflorescences 2-4(-7)-flowered in racemose cymes or with flowers borne singly; bracts 2, opposite, plus 1 subtending each successive flower if more than 1 flower, linear-oblong, linear-lanceolate, or lanceolate, (2-)4-10 mm, margins glandular-toothed, sometimes eglandular-toothed, apex acute. Flowers pedicellate, not disarticulate in fruit, 1.5-2 cm diam.; sepals 2, suborbiculate, broadly ovate, or obovate, 2-6 mm, herbaceous at anthesis, margins usually glandular-toothed, sometimes eglandular-toothed or rarely ± entire, apex usually truncate, sometimes rounded, obtuse, subacute, or apiculate; petals 5-9, white, pink, or magenta, sometimes green at base, narrowly oblong, elliptic, or oblanceolate, 4-10 mm; stamens (4-)5-8; stigmas 3-6; pedicel 2-5(-10) mm. Capsules 4-5 mm. Seeds 15-24, 1-2 mm, shiny, smooth. 2n = ca. 66.
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Distribution
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Alta., B.C., Yukon; Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.
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Flowering/Fruiting
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Flowering late spring-late summer.
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Habitat
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Open places in short turf or gravelly or rocky substrates; 2300-4200m.
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Synonym
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Talinum pygmaeum A. Gray, Amer. J. Sci. Arts, ser. 2, 33: 407. 1862 (as pygnaeum); Calandrinia grayi Britton; C. pygmaea (A. Gray)A. Gray 1873, not F. Mueller 1859; Lewisia exarticulata H. St. John; L. glandulosa (Rydberg) Clay; L. minima (A. Nelson) A. Nelson; L. pygmaea var. aridorum Bartlett; L. pygmaea subsp. glandulosa (Rydberg) Ferris; L. sierrae Ferris; Oreobroma aridorum (Bartlett) A. Heller; O. exarticulatum (H. St. John) Rydberg; O. glandulosum Rydberg; O. grayi (Britton) Rydberg; O. minimum A. Nelson; O. pygmaeum (A. Gray) Howell
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Comprehensive Description
provided by North American Flora
Oreobroma exarticulatum (St. John) Rydberg
Lewisia exarticulata St. John, Res. Stud. State Coll. Wash. 1: 59. 1929.
Perennial, with a thick fleshy root 1-2 cm. long; basal leaves fleshy, petioled, the petioles winged, 1-2 cm. long, the blade fleshy, linear-oblanceolate, obtuse, 2-3 cm. long, 1.5 cm. wide; scapes several, usually 1-flowered; bracts 2, opposite, 2-3 mm. below the flower, oblongoblanceolate, prominently veined, glandular-dentate, 2-4 mm. long; sepals orbicular, veiny, glandular-dentate; petals 8, greenish-white, 6-7 mm. long, oblanceolate; stamens 4; filaments hyaline, narrowly deltoid; stigmas 4; capsule ovoid, transparent; seeds about 24, chestnutbrown, about 1-3 mm. long.
Type locality: Panorama Point, Mount Rainier, Washington. Distribution: Mount Rainier.
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- Percy Wilson, Per Axel Rydberg. 1932. CHENOPODIALES. North American flora. vol 21(4). New York Botanical Garden, New York, NY
Comprehensive Description
provided by North American Flora
Oreobroma pygmaeum (A. Gray) Howell, Erythea 1: 32. 1893
Talinum pygmaeum A. Gray, Am. Jour. Sci. II. 33: 407. 1862.
Calandrinia pygmaea A. Gray, Proc. Am. Acad. 8: 623. 1873. Not C. pygmaea F. Muell. 1859.
Calandrinia Grayi Britton, Bull. Torrey Club 17: 312. 1890.
Lewisia pygmaea B. L. Robinson, in A. Gray, Syn. Fl. N. Am. I 1 : 268. 1897.
Oreobroma Grayi Rydb. Mem. N. Y. Bot. Gard. 1: 137. 1900.
Subacaulescent perennial, with a fusiform root up to 1 cm. thick; basal leaves numerous, linear or linear-oblanceolate, 3-7 cm. long, 1-3 mm. wide; scape 1-3-flowered, 2-6 cm. high; bracteate at or below the middle; bracts lance-linear, connate at the base, 5-10 mm. long; sepals suborbicular, rounded or truncate and glandular-dentate at the apex, 4—5 mm. long, strongly veined; petals 6-8, pink or white, 8-10 mm. long, unequal; stamens 5-8, stigmas 3-5; capsule ovoid, 4-5 mm. long; seeds 15-20, black, ovate, shining, muriculate, 1 mm. long.
Type locality: Bridger's Pass, Wyoming.
Distribution: Rocky crests, Montana to Colorado, California, and Washington.
- bibliographic citation
- Percy Wilson, Per Axel Rydberg. 1932. CHENOPODIALES. North American flora. vol 21(4). New York Botanical Garden, New York, NY
Comprehensive Description
provided by North American Flora
Oreobroma aridorum (Bartlett) A. Heller, Muhlenbergia 6: 83 1910.
Lewisia pygmaca aridorum Bartlett, Bot. Gaz. 44: 303. 1907.
Subacaulescent perennial, with a fusiform root ; basal leaves linear-oblanceolate, 3-6 cm. long, 2-4 mm. wide, acute; scape 1-5-flowered, 3-5 cm. high; bracteate above them iddle; bracts linear or oblong, connate at the base, about 5 mm. long, glandular-dentate; sepals 5 mm. long, suborbicular, rounded at the apex, strongly reticulate-veined, glandular-dentate at the apex, the glands black or dark-brown, distinctly stipitate; petals white, narrowly oblong, ..landular-dentate at the apex; capsule ovoid, dark-brown, 4.5 mm. long; seeds nearly black, shining, fully 1 mm. long.
Tvi-k locality: Bare places in the meadows, Mount Paddo Miami Adams i. Washington. Distribution: Known only from the type locality.
- bibliographic citation
- Percy Wilson, Per Axel Rydberg. 1932. CHENOPODIALES. North American flora. vol 21(4). New York Botanical Garden, New York, NY
Lewisia pygmaea
provided by wikipedia EN
Lewisia pygmaea is a species of flowering plant in the family Montiaceae known by the common name alpine lewisia and pygmy bitterroot. It is native to western North America from Alaska and Alberta to California and New Mexico, where it grows in many types of moist, rocky mountain habitat, such as gravel beds and sandy meadows.
Description
Lewisia pygmaea is a highly variable species with a wide distribution, and it often hybridizes with other Lewisia species, making identification difficult. In general, this is a petite perennial herb growing from a taproot and caudex unit, and producing a basal rosette of several leaves 2 to 8 centimeters long. The leaves are narrow but thick and fleshy, blunt-tipped, and linear to lance-shaped. The inflorescence is usually made up of a few very short stems each bearing one or more flowers which appear to be sitting on or within the basal leaf rosette. Each flower has 5 to 9 white, pink or red petals which may or may not have dark veining or striping. The petals are 4 millimeters to 1 centimeter long.
Habitat and Range
Lewisia pygmaea grows in open areas with short turf and in gravelly or rocky soils. It can be found naturally growing in Alta., B.C., Yukon; Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.[1]
References
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Lewisia pygmaea: Brief Summary
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Lewisia pygmaea is a species of flowering plant in the family Montiaceae known by the common name alpine lewisia and pygmy bitterroot. It is native to western North America from Alaska and Alberta to California and New Mexico, where it grows in many types of moist, rocky mountain habitat, such as gravel beds and sandy meadows.
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