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Lewisiopsis tweedyi

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

Mt. Hood pussypaws

Habit Plants perennial, taprooted; caudex short-branching. Plants perennial, taprooted; caudex branching.
Stems

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

1 from each rosette, ascending to erect, to 60 cm.

Leaves

basal, in loose rosettes;

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

basal in 2–many prostrate rosettes, blade spatulate, (0.5–)2–7(–15) cm;

cauline leaves usually absent.

Inflorescences

racemose, 1–5(–8)-flowered.

umbellate or subumbellate, dense, globose, 1–2 cm diam.

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.

subsessile;

sepals orbiculate, equal, 3–8 mm, scarious;

petals 4, white, 3–8 mm;

stamens 3, anther red or yellow;

style exserted, filiform;

stigmas 2.

Capsules

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

valves 3–4, splitting from base toward apex.

globose, 2–3 mm;

valves 2.

Seeds

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

1–8, black, orbicular-reniform, 0.7–1.2 mm, shiny.

2n

= 46, 92.

= 44.

Cistanthe tweedyi

Cistanthe umbellata

Phenology Flowering May–Jul. Flowering May–Oct.
Habitat Well-drained granitic talus slopes and ledges, often in ponderosa pine duff Dry sandy or gravelly soils
Elevation 600-2200 m (2000-7200 ft) 1500-4300 m (4900-14100 ft)
Distribution
from FNA
WA; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; ID; MT; NV; OR; UT; WA; WY; BC
[WildflowerSearch map]
Discussion

Of conservation concern.

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

Source FNA vol. 4, p. 464. FNA vol. 4, p. 464.
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. quadripetala, C. rosea, C. tweedyi
Synonyms Calandrinia tweedyi, Lewisia tweedyi, Lewisiopsis tweedyi Spraguea umbellata, Calyptridiumu mbellatum, Calyptridiumu umbellatum var. caudiciferum, Spraguea umbellata var. caudicifera
Name authority (A. Gray) Hershkovitz: Phytologia 68: 268. (1990) (Torrey) Hershkovitz: Phytologia 68: 268. (1990)
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