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opposite-leaf lewisia

Stebbins' lewisia

Taproots

gradually ramified distally.

gradually ramified distally.

Stems

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

procumbent, 1.5–14 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 after anthesis, gradually tapered to broad petiole, blade oblanceolate, spatulate, or obovate, flattened, 2.5–8.5 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.

subumbellate cymes, 1–3-branched, 3–11-flowered;

bracts several, usually an opposite pair proximally, plus 2 at each flowering node distally, ovate to elliptical, 1.8–3 mm, margins glandular-toothed, 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.

pedicellate, not disarticulate in fruit;

sepals 2, broadly ovate, 3.5–7 mm, herbaceous at anthesis, margins glandular-toothed, apex rounded to truncate;

petals 7–10, magenta or carmine with whitish bases, veins darker, oblanceolate or obovate, 8–10 mm;

stamens 10–13;

stigmas 3–4;

pedicel 8–25 mm.

Capsules

5–6 mm.

5–7 mm.

Seeds

5–15, 1–1.8 mm, shiny, smooth.

20, 1.5–2 mm, shiny, smooth.

Lewisia oppositifolia

Lewisia stebbinsii

Phenology Flowering spring. Flowering late spring–early summer.
Habitat Decomposed serpentine substrates Open meadows in dryish, rocky or gravelly soils
Elevation 300-1300 m (1000-4300 ft) 1900 m (6200 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 stebbinsii is known only from the north Coast Ranges in Mendocino County

(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. triphylla
Synonyms Calandrinia oppositifolia, Oreobroma oppositifolium
Name authority (S. Watson) B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1: 268. (1897) Gankin & W. R. Hildreth: Four Seasons 2(4): 13, figs. a–c. (1968)
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