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Idaho saxifrage, Marshall's saxifrage

branch-lettuce, lettuceleaf saxifrage

Habit Plants in groups or sometimes mat-forming, rhizomatous. Plants solitary or in groups, with bulbils on caudices.
Leaves

basal;

petiole flattened, 3–15 cm;

blade ovate, 1–5 cm, ± fleshy, base attenuate, margins shallowly crenate-serrate (teeth ca. 2 mm), eciliate, surfaces sparsely tangled, reddish brown-hairy abaxially, glabrate adaxially.

basal;

petiole ± indistinct, (broad), flattened, 3–15 cm;

blade lanceolate to oblanceolate, 4–35 cm, thin, base attenuate, margins irregularly serrate to dentate, ciliate, surfaces sparsely hairy.

Inflorescences

15–50+-flowered, open, lax thyrses, 20–40 cm, purple-tipped stipitate-glandular.

(30–)50+–flowered, very open, lax thyrses, 30–75 cm, pink- to purplish-tipped stipitate-glandular; (bracts gradually smaller distally).

Flowers

sepals reflexed, lanceolate to oblong;

petals white, with 2 basal yellow spots (often faded when dried), ovate, clawed, 1.5–4.5 mm, longer than sepals;

filaments strongly club-shaped, sometimes petaloid (short-clawed, equaling petals);

pistils distinct almost to base;

ovary superior, (to 1/3 adnate to hypanthium).

sepals strongly reflexed, oblong;

petals white, with 2 basal yellow spots that sometimes appear as 1 (sometimes faded in dried material), ± elliptic to spatulate, clawed, 2–3 mm, longer than sepals;

filaments strongly club-shaped;

pistils distinct almost to base;

ovary superior, (to 1/3 adnate to hypanthium).

Capsules

greenish to reddish purple, folliclelike.

green, sometimes purplish, folliclelike.

2n

= 20.

= 22.

Micranthes marshallii

Micranthes micranthidifolia

Phenology Flowering spring. Flowering spring.
Habitat Deeply shaded watercourses, stream banks, seeps Rocky seepage slopes, stream banks
Elevation 100-1000 m (300-3300 ft) 400-2100 m (1300-6900 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
GA; KY; MD; NC; PA; SC; VA; WV
[WildflowerSearch map]
[BONAP county map]
Discussion

Micranthes micranthidifolia was formerly gathered by local people in the southern Appalachians as a spring “green” (hence the common name, “branch” being dialect for a small stream); it is still occasionally seen in local grocery stores.

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

Source FNA vol. 8, p. 63. FNA vol. 8, p. 60.
Parent taxa Saxifragaceae > Micranthes Saxifragaceae > Micranthes
Sibling taxa
M. apetala, M. aprica, M. bryophora, M. californica, M. calycina, M. careyana, M. caroliniana, M. eriophora, M. ferruginea, M. foliolosa, M. fragosa, M. gaspensis, M. gormanii, M. hieraciifolia, M. hitchcockiana, M. howellii, M. idahoensis, M. integrifolia, M. lyallii, M. micranthidifolia, M. nelsoniana, M. nidifica, M. nivalis, M. nudicaulis, M. occidentalis, M. odontoloma, M. oregana, M. palmeri, M. pensylvanica, M. petiolaris, M. razshivinii, M. reflexa, M. rhomboidea, M. rufidula, M. spicata, M. stellaris, M. subapetala, M. tempestiva, M. tenuis, M. texana, M. tischii, M. tolmiei, M. unalaschcensis, M. virginiensis
M. apetala, M. aprica, M. bryophora, M. californica, M. calycina, M. careyana, M. caroliniana, M. eriophora, M. ferruginea, M. foliolosa, M. fragosa, M. gaspensis, M. gormanii, M. hieraciifolia, M. hitchcockiana, M. howellii, M. idahoensis, M. integrifolia, M. lyallii, M. marshallii, M. nelsoniana, M. nidifica, M. nivalis, M. nudicaulis, M. occidentalis, M. odontoloma, M. oregana, M. palmeri, M. pensylvanica, M. petiolaris, M. razshivinii, M. reflexa, M. rhomboidea, M. rufidula, M. spicata, M. stellaris, M. subapetala, M. tempestiva, M. tenuis, M. texana, M. tischii, M. tolmiei, M. unalaschcensis, M. virginiensis
Synonyms Saxifraga marshallii Robertsonia micranthidifolia, Aulaxis micranthidifolia, Saxifraga micranthidifolia
Name authority (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 145. 1905 , (Haworth) Small: Fl. S.E. U.S., 501, 1331. 1903 ,
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