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Lewisiopsis tweedyi

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

four-petal pussypaws

Habit Plants perennial, taprooted; caudex short-branching. Plants annual, 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, 1.5–13 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, 0.5–6 cm.

Inflorescences

racemose, 1–5(–8)-flowered.

racemose or paniculate scorpioid cymes, ± 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 orbiculate to reniform, unequal, 4–6 mm, margins scarious;

petals disarticulate in fruit, 4, pink to rose or white, 2–3 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, 3–4 mm;

valves 2.

Seeds

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

5–14, black, orbicular, 0.5–0.6 mm, shiny.

2n

= 46, 92.

= 44.

Cistanthe tweedyi

Cistanthe quadripetala

Phenology Flowering May–Jul. Flowering Apr–Jun.
Habitat Well-drained granitic talus slopes and ledges, often in ponderosa pine duff Open areas, usually on serpentine
Elevation 600-2200 m (2000-7200 ft) 500-2000 m (1600-6600 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. pygmaea, C. rosea, C. tweedyi, C. umbellata
Synonyms Calandrinia tweedyi, Lewisia tweedyi, Lewisiopsis tweedyi Calyptridium quadripetalum
Name authority (A. Gray) Hershkovitz: Phytologia 68: 268. (1990) (S. Watson) Hershkovitz: Phytologia 68: 268. (1990)
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