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Claytonia megarhiza var. nivalis

alpine springbeauty

little spring beauty, pale claytonia, pale spring-beauty, pallid claytonia, serpentine springbeauty

Habit Plants perennial, with stout, woody caudices; periderm 5–12 mm. Plants annual, with minute, tuberous bodies; periderm absent.
Stems

5–25 cm.

5–10 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.

blades gray, beige, or pink, glaucous;

basal leaf blades linear or spatulate, 1–6 × 0.05–0.5 cm;

cauline leaves sessile, distinct or partially connate into horn shape, blade spatulate, 0.2–4.5 cm, or subperfoliate, blade 0.2–4.5 cm wide.

Inflorescences

multibracteate;

bracts subtending pedicels, apex obtuse.

1-bracteate;

bract leaflike, 0.5–15 mm.

Flowers

12–20 mm diam;

sepals 6–8 mm;

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

ovules 6.

3–5 mm diam.;

sepals 1.5–2.5 mm;

petals white or pinkish, 2–5 mm;

ovules 3.

Seeds

2–3 mm diam., shiny and smooth;

elaiosome 1 mm or less.

0.5–1 mm, tuberculate;

elaiosome inserted in wide notch of seed coat, 0.5–1 mm.

2n

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

= 16, 32, 48.

Claytonia megarhiza

Claytonia exigua

Phenology Flowering May–Aug.
Habitat Talus, scree, gravelly slopes
Elevation 2000-4000 m (6600-13100 ft)
Distribution
from FNA
CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; NT
from FNA
CA; NV; OR; WA; BC
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[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

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

Key
1. Cauline leaves distinct or partially connate into horn shape; petals 2-6 mm
subsp. exigua
1. Cauline leaves perfoliate; petals 2-3 mm
subsp. glauca
Source FNA vol. 4, p. 469. FNA vol. 4, p. 468.
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. 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
Subordinate taxa
C. exigua subsp. exigua, C. exigua subsp. glauca
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) Douglas ex Torrey & A. Gray: Fl. N. Amer. 1: 200. (1838)
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