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opposite-leaf lewisia

Yosemite lewisia

Taproots

gradually ramified distally.

gradually ramified distally.

Stems

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

erect, 0.5–3 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 at or soon after anthesis, sessile, blade linear to slightly clavate, terete, 0.8–2 cm, margins entire, apex obtuse;

cauline leaves absent.

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.

with flowers borne singly;

bracts 2–4, proximal in 1 pair, ovate to lanceolate, 2–3 mm, margins entire, apex acute.

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.

sessile to subsessile, disarticulate in fruit;

sepals 2, broadly obovate to broadly ovate, 7–8 mm, scarious at anthesis, margins entire, apex rounded or sometimes emarginate;

petals 5–8, pale rose-pink, oblanceolate to broadly obovate, 13–18 mm, apex obtuse;

stamens 1–15;

stigmas 4.

Capsules

5–6 mm.

Seeds

5–15, 1–1.8 mm, shiny, smooth.

11–15, 2.8–3.5 mm.

Lewisia oppositifolia

Lewisia disepala

Phenology Flowering spring. Flowering late winter-mid(-late) spring.
Habitat Decomposed serpentine substrates Granitic formations on rocky, gravelly, or sandy substrate
Elevation 300-1300 m (1000-4300 ft) 1900-2600 m (6200-8500 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[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.)

Of conservation concern.

Lewisia disepala is known only from scattered localities in the southern Sierra Nevada.

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

Source FNA vol. 4, p. 483. FNA vol. 4, p. 481.
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. kelloggii, L. leeana, L. longipetala, L. maguirei, L. nevadensis, L. oppositifolia, L. pygmaea, L. rediviva, L. stebbinsii, L. triphylla
Synonyms Calandrinia oppositifolia, Oreobroma oppositifolium L. rediviva var. yosemitana
Name authority (S. Watson) B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1: 268. (1897) Rydberg: in N. L. Britton et al., N. Amer. Fl. 21: 328. (1932)
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