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Claytonia megarhiza var. nivalis

alpine springbeauty

Great Basin claytonia, Great Basin springbeauty, umbellate springbeauty

Habit Plants perennial, with stout, woody caudices; periderm 5–12 mm. Plants perennial, with globose tubers 10–50 mm diam., mature plants rhizomatous; periderm 5–20 mm.
Stems

5–25 cm.

2–25 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 somtimes absent, petiolate, 5–25 cm, blade elliptic to rhombic, 1–3 × 0.2–2 cm;

cauline leaves petiolate, blade elliptic to ovate 1.5–5 × 1–3 cm, abruptly tapered at base.

Inflorescences

multibracteate;

bracts subtending pedicels, apex obtuse.

ebracteate.

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 5–7 mm;

petals pink to magenta, 6–12 mm;

ovules 6.

Seeds

2–3 mm diam., shiny and smooth;

elaiosome 1 mm or less.

1–2 mm, smooth and shiny;

elaiosome 1 mm or less.

2n

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

= 16.

Claytonia megarhiza

Claytonia umbellata

Phenology Flowering May–Aug. Flowering May–Aug.
Habitat Talus, scree, gravelly slopes North- and east-facing talus and scree slopes of drier mountain areas, subalpine coniferous forests
Elevation 2000-4000 m (6600-13100 ft) 100-3000 m (300-9800 ft)
Distribution
from FNA
CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; NT
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

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

Source FNA vol. 4, p. 469. FNA vol. 4, p. 475.
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. 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. virginica, C. washingtoniana
Synonyms C. arctica var. megarhiza, C. megarhiza var. bellidifolia, C. megarhiza var. nivalis
Name authority (A. Gray) Parry ex S. Watson: Smithsonian Misc. Collect 258: 118. (1878) S. Watson: Botany (Fortieth Parallel), 43, plate 6, figs. 4, 5. (1871)
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