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Claytonia megarhiza var. nivalis

alpine springbeauty

lanceleaf springbeauty, Rydberg's spring-beauty

Habit Plants perennial, with stout, woody caudices; periderm 5–12 mm. Plants perennial, with globose tubers 10–30 mm diam.; periderm 1–5 mm.
Stems

5–25 cm.

10–30 cm.

Leaves

basal leaves sessile, dilated at base into broad, succulent sheath, blade rhombic to oblanceolate, 2–10 × 0.4–2.8 cm, apex obtuse;

cauline leaves sessile, blade oblanceolate, 2–10 × 2–5 mm.

basal leaves sometimes absent, petiolate, blades linear to narrowly lanceolate, 1–8 × 0.2–1.3 cm, apex acute;

cauline leaves sessile, blade linear or linear-lanceolate, 2–10 cm, distinctly tapered.

Inflorescences

multibracteate;

bracts subtending pedicels, apex obtuse.

multibracteate;

proximalmost bracts leaflike, inserted proximal to pedicels of proximalmost cluster of flowers, distal bracts reduced to membranous scales, rarely with 1 bract.

Flowers

12–20 mm diam;

sepals 6–8 mm;

petals white, pink, or rose, 5–20 × 3–8 mm;

ovules 6.

8–14 mm diam.;

sepals 3–5 mm;

petals white with yellow spots at base, creamy white, or rich yellow to yellow-orange, 8–10 mm;

ovules 6.

Seeds

2–3 mm diam., shiny and smooth;

elaiosome 1 mm or less.

1–2 mm diam., shiny and smooth to minutely tuberculate;

elaiosome 1 mm or less.

2n

= 12, 16, 24, 32, 34, 36.

= 16.

Claytonia megarhiza

Claytonia multiscapa

Phenology Flowering May–Aug. Flowering May–Aug.
Habitat Talus, scree, gravelly slopes Moist to dry grasslands and montane coniferous forests, often in swales with heavy, poorly drained clay soils in the south to wet, rocky tundra in the north
Elevation 2000-4000 m (6600-13100 ft) 0-2000 m (0-6600 ft)
Distribution
from FNA
CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; NT
from FNA
AK; ID; MT; WA; WY; BC; Eurasia (Russia)
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Discussion

Claytonia multiscapa has been the source of taxonomic differences of opinion. Local floras have treated the synonymous C. flava as a distinct species (e.g., R. D. Dorn 1977) while one regional flora (C. L. Hitchcock et al. 1955–1969, vol. 2) united it with C. lanceolata. It is treated here as a distinct species based on the electrophoretic and field work of J. S. Shelly (1998) and the author’s examination of type material.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 4, p. 469. FNA vol. 4, p. 470.
Parent taxa Portulacaceae > Claytonia Portulacaceae > Claytonia
Sibling taxa
C. acutifolia, C. arctica, C. arenicola, C. caroliniana, C. cordifolia, C. exigua, C. gypsophiloides, C. lanceolata, C. megarhiza, C. multiscapa, C. nevadensis, C. ogilviensis, C. palustris, C. parviflora, C. perfoliata, C. rosea, C. rubra, C. sarmentosa, C. saxosa, C. scammaniana, C. sibirica, C. tuberosa, C. umbellata, C. virginica, C. washingtoniana
C. acutifolia, C. arctica, C. arenicola, C. caroliniana, C. cordifolia, C. exigua, C. gypsophiloides, C. lanceolata, C. megarhiza, C. nevadensis, C. ogilviensis, C. palustris, C. parviflora, C. perfoliata, C. rosea, C. rubra, C. sarmentosa, C. saxosa, C. scammaniana, C. sibirica, C. tuberosa, C. umbellata, C. virginica, C. washingtoniana
Synonyms C. arctica var. megarhiza, C. megarhiza var. bellidifolia, C. megarhiza var. nivalis C. czukczorum, C. lanceolata var. flava, C. lanceolata var. multiscapa, C. lanceolata var. pacifica, C. tuberosa var. czukczorum
Name authority (A. Gray) Parry ex S. Watson: Smithsonian Misc. Collect 258: 118. (1878) Rydberg: Fl. Rocky Mts., 263, 1061. (1917)
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