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opposite-leaf lewisia

three leaf bitterroot, three-leaf lewisia

Taproots

gradually ramified distally.

cormlike, globose.

Stems

erect, basal nodes underground, 10–20(–25) cm.

lax to erect, 3–11 cm.

Leaves

basal leaves withering at or soon after anthesis, abruptly narrowed into broad petiole, blade linear-spatulate to linear-oblanceolate, flattened, 4–11 cm, margins entire, apex obtuse to subacute;

cauline leaves opposite, in 1–3 pairs near stem base, smaller than and similar to basal leaves.

basal leaves withering before anthesis, ± sessile, blade narrowly linear to filiform, subcylindric, 1–6 cm, margins entire, apex obtuse to subacute;

cauline leaves 2–3(–5), paired or whorled, blade similar to basal leaves, 10–50 mm.

Inflorescences

racemose to subumbellate cymes, (1–)2–5(–6)-flowered;

bracts alternate proximally, 1–many at each flowering node distally, lanceolate, 4–8 mm, margins entire or toothed at apex, apex acute to acuminate.

usually subumbellate to paniculate cymes, (1–)3–25-flowered;

bracts 2 per flower, ovate to lanceolate, 1–5 mm, margins entire, apex obtuse to subacute.

Flowers

pedicellate, not disarticulate in fruit;

sepals 2, suborbiculate, 4–8(–10) mm, herbaceous at anthesis, margins coarsely toothed but not glandular, apex obtuse to rounded;

petals 8–11, pink fading to white, oblanceolate to obovate, 9–15 mm;

stamens 8–18;

stigmas 3–5;

pedicel 20–75 mm.

pedicellate, not disarticulate in fruit;

sepals 2, ovate, 2–4 mm, herbaceous, margins entire, apex rounded to obtuse;

petals 5–9, white or pinkish with darker veins, elliptic-obovate to elliptic-ovate, 4–7 mm;

stamens (3–)4(–5);

stigmas 3–5;

pedicel 5–15(–25) mm.

Capsules

5–6 mm.

3–4 mm.

Seeds

5–15, 1–1.8 mm, shiny, smooth.

8–25, 1 mm, shiny, shallowly tuberculate.

Lewisia oppositifolia

Lewisia triphylla

Phenology Flowering spring. Flowering late spring–summer.
Habitat Decomposed serpentine substrates Open places, sandy to gravelly soils, sometimes alpine meadows, usually near melting snow
Elevation 300-1300 m (1000-4300 ft) 1500-3300 m (4900-10800 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; CO; ID; MT; NV; OR; UT; WA; WY; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Lewisia oppositifolia is known only from Del Norte County, California, and Josephine County, Oregon.

The floral symmetry of Lewisia oppositifolia may be somewhat elliptical, the outer two petals alternating with the sepals and the remaining petals imbricate and opposite the sepals, giving the flowers a pinched appearance, a feature also reported for L. nevadensis. The more diminutive, higher-elevation plants of L. oppositifolia possibly represent a distinct taxon that has been informally recognized as “Lewisia richeyi” (B. Mathew 1989b).

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

Source FNA vol. 4, p. 483. FNA vol. 4, p. 484.
Parent taxa Portulacaceae > Lewisia Portulacaceae > Lewisia
Sibling taxa
L. brachycalyx, L. cantelovii, L. columbiana, L. congdonii, L. cotyledon, L. disepala, L. kelloggii, L. leeana, L. longipetala, L. maguirei, L. nevadensis, L. pygmaea, L. rediviva, L. stebbinsii, L. triphylla
L. brachycalyx, L. cantelovii, L. columbiana, L. congdonii, L. cotyledon, L. disepala, L. kelloggii, L. leeana, L. longipetala, L. maguirei, L. nevadensis, L. oppositifolia, L. pygmaea, L. rediviva, L. stebbinsii
Synonyms Calandrinia oppositifolia, Oreobroma oppositifolium Claytonia triphylla, Erocallis triphylla, Oreobroma triphyllum
Name authority (S. Watson) B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1: 268. (1897) (S. Watson) B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1: 269. (1897)
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