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Lewisiopsis tweedyi

Tweedy's bitterroot, Tweedy's lewisia, Tweedy's pussypaws

pygmy pussypaws

Habit Plants perennial, taprooted; caudex short-branching. Plants annual, taprooted or roots fibrous.
Stems

1 or more from each rosette, 10–20 cm, bracts scattered proximally, ovate-lanceolate, scarious.

2 or more from each rosette, spreading to erect, leafy, 0.5–8 cm.

Leaves

basal, in loose rosettes;

blade elliptic-lanceolate to ovate or oblanceolate, narrowing to broad petiole, 6–15 cm.

basal and cauline;

basal in single, prostrate rosette;

blade spatulate, 0.5–1.5 cm.

Inflorescences

racemose, 1–5(–8)-flowered.

paniculate or racemose, often secund, ± dense.

Flowers

pedicellate;

sepals broadly ovate, 9–10 mm, scarious;

petals 7–9(–12), salmon-pink to yellowish, rarely white, 25–40 mm;

stamens 10–23, anther yellow;

style present;

stigmas 3;

pedicel 20–60 mm.

pedicellate;

sepals ovate, 2–4 mm, fleshy, becoming membranaceous;

petals persistent in fruit, 4, white, 3 mm;

stamens 1(–3), anther yellow;

style absent;

stigmas 2;

pedicel 1–3 mm.

Capsules

ovoid, 7–10 mm, dehiscence circumscissile near base;

valves 3–4, splitting from base toward apex.

ovoid, 3–5 mm;

valves 2.

Seeds

12–35, dark brownish red, suborbicular to reniform, 2 mm, not shiny, warty, strophiolate.

5–9, black, orbicular, 0.3–0.7 mm, shiny.

2n

= 46, 92.

= 44.

Cistanthe tweedyi

Cistanthe pygmaea

Phenology Flowering May–Jul. Flowering Jun–Jul.
Habitat Well-drained granitic talus slopes and ledges, often in ponderosa pine duff Dry, less often moist, sandy or gravelly soils
Elevation 600-2200 m (2000-7200 ft) 1900-3500 m (6200-11500 ft)
Distribution
from FNA
WA; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
Discussion

Of conservation concern.

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

Source FNA vol. 4, p. 464. FNA vol. 4, p. 463.
Parent taxa Portulacaceae > Cistanthe Portulacaceae > Cistanthe
Sibling taxa
C. ambigua, C. maritima, C. monandra, C. monosperma, C. parryi, C. pulchella, C. pygmaea, C. quadripetala, C. rosea, C. tweedyi, C. umbellata
C. ambigua, C. maritima, C. monandra, C. monosperma, C. parryi, C. pulchella, C. quadripetala, C. rosea, C. tweedyi, C. umbellata
Synonyms Calandrinia tweedyi, Lewisia tweedyi, Lewisiopsis tweedyi Calyptridium pygmaeum
Name authority (A. Gray) Hershkovitz: Phytologia 68: 268. (1990) (Parish ex Rydberg) Hershkovitz: Phytologi a 68: 268. (1990)
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