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Pacific mitrewort, threepart miterwort

creeping mitrewort, slightstem miterwort

Habit Plants not stoloniferous. Plants usually stoloniferous.
Flowering stems

12–45 cm.

13–45 cm.

Leaves

petiole 2.5–10 cm, subglabrous or short stipitate-glandular and long stipitate-glandular, longer hairs retrorse, white, tan, or brown;

blade cordate, cordate-ovate, or reniform, usually shorter than or sometimes ± as long as wide, 1.2–6 × 2–8 cm, margins shallowly 5- or 7-lobed, crenate, uniformly ciliate, apex of terminal lobe rounded to obtuse, surfaces short stipitate-glandular and sparsely long stipitate-glandular;

cauline leaves absent.

petiole 1.5–14 cm, short stipitate-glandular and, usually, long stipitate-glandular, longer hairs spreading to retrorse, white;

blade broadly cordate to broadly ovate, ± as long as wide, 1.2–6.5(–8.5) × 1.4–7(–8.2) cm, margins 3-, 5-, or 7-lobed, crenate-dentate, irregularly ciliate, apex of terminal lobe acute to obtuse, surfaces short stipitate-glandular and sparsely long stipitate-glandular;

cauline leaves 1–3, proximal or mid cauline, alternate, sessile or petiolate, blade 0.3–4.3(–6) × 0.4–4.4(–7) cm.

Inflorescences

1–3, closely 4–20-flowered, 1 flower per node, weakly secund or not secund, 12–45 cm, short stipitate-glandular and, sometimes, sparsely long stipitate-glandular proximally and distally.

1–2(–4), remotely 5–25-flowered, 1(–2) flowers per node, (anthesis basipetalous), not secund, 13–45 cm, short stipitate-glandular and sparsely long stipitate-glandular proximally, short stipitate-glandular distally.

Pedicels

0.3–1.5 mm, short stipitate-glandular.

2–8 mm, short stipitate-glandular.

Flowers

hypanthium campanulate, 1–1.5 × 1.5–2.5(–3) mm;

sepals erect or spreading, whitish or purple tinged, oblong to triangular-ovate, 0.8–1.5 × 1–1.3 mm;

petals white, sometimes pink or purple tinged, 3-lobed or, sometimes, unlobed, 1–3.5 mm, lobes lanceolate, lateral lobes ascending;

stamens 5, opposite sepals;

filaments white, 0.1–0.2 mm;

anthers 0.1–0.2 × 0.1–0.2 mm;

ovary ca. 1/2 inferior;

styles divergent, flattened, 0.1–0.2 mm;

stigmas unlobed.

hypanthium broadly campanulate, 1.5–2 × 3–5.5 mm;

sepals spreading or recurved, greenish, deltate-ovate, 0.9–1.5 × 1.4–2 mm;

petals whitish green or greenish, sometimes purple tinged proximally, 5–9-lobed, 3–4 mm, lobes linear, lateral lobes spreading;

stamens 5, opposite sepals;

filaments usually purple proximally and white distally, sometimes entirely white, 0.6–0.9 mm;

anthers 0.2–0.4 × 0.2–0.4 mm;

ovary 1/2 inferior;

styles erect or spreading, cylindric, 0.8–1.1 mm;

stigmas unlobed.

Seeds

dark reddish brown, 0.7–1 mm, pitted.

reddish purple or dark reddish brown, 0.7–1 mm, pitted.

2n

= 14.

= 14.

Mitella trifida

Mitella caulescens

Phenology Flowering May–Jul. Flowering Apr–Jul.
Habitat Deep forest, moist wooded and open slopes Deep woods, meadows, stream banks
Elevation 300-2000 m (1000-6600 ft) 0-2100 m (0-6900 ft)
Distribution
from FNA
AK; CA; ID; MT; OR; WA; AB; BC
from FNA
CA; ID; MT; OR; WA; BC
[WildflowerSearch map]
Discussion

Mitella trifida varies in flower size, petal-blade lobing, and pubescence. Plants with relatively small flowers and petal blades entire or shallowly trifid and often purplish have been named var. violacea. Plants matching this description occur in British Columbia, Montana, and Washington and appear to represent a minor morphological variant that does not warrant recognition.

The Gosiute Indians of Utah made an infusion from roots of Mitella trifida to treat colic (D. E. Moerman 1998).

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

Source FNA vol. 8, p. 114. FNA vol. 8, p. 112.
Parent taxa Saxifragaceae > Mitella Saxifragaceae > Mitella
Sibling taxa
M. breweri, M. caulescens, M. diphylla, M. diversifolia, M. nuda, M. ovalis, M. pentandra, M. stauropetala
M. breweri, M. diphylla, M. diversifolia, M. nuda, M. ovalis, M. pentandra, M. stauropetala, M. trifida
Synonyms M. trifida var. violacea, Ozomelis anomola, Ozomelis micrantha, Ozomelis trifida Mitellastra caulescens
Name authority Graham: Edinburgh New Philos. J. 7: 185. 1829 , Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 586. 1840 ,
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