The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

Idaho saxifrage, Marshall's saxifrage

storm 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 (leaves appearing sessile), flattened, 2–8+ mm;

blade oblanceolate to obovate, 4–10(–30) mm, fleshy, base cuneate to attenuate, margins entire or minutely denticulate, eciliate, (apex acute to obtuse or rounded), surfaces ± glabrous; (venation pinnate or palmate).

Inflorescences

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

5–15(–20)-flowered, congested thyrses, 3–10(–15) cm, glabrous or sparsely purple-tipped stipitate-glandular.

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 spreading, ovate;

petals white, not spotted, linear to obovate, clawed, to 1.5 mm, shorter than sepals;

filaments linear, flattened;

pistils connate to 1/2 their lengths;

ovary inferior.

Capsules

greenish to reddish purple, folliclelike.

reddish purple, valvate.

2n

= 20.

= 10.

Micranthes marshallii

Micranthes tempestiva

Phenology Flowering spring. Flowering summer.
Habitat Deeply shaded watercourses, stream banks, seeps Rocky ledges, slopes, or snow-bed meadows
Elevation 100-1000 m (300-3300 ft) 2400-3200 m (7900-10500 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
MT
[BONAP county map]
Discussion

Of conservation concern.

Micranthes tempestiva is known only from the Bitterroot Mountains and Anaconda Range.

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

Source FNA vol. 8, p. 63. FNA vol. 8, p. 69.
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. 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. tenuis, M. texana, M. tischii, M. tolmiei, M. unalaschcensis, M. virginiensis
Synonyms Saxifraga marshallii Saxifraga tempestiva
Name authority (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 145. 1905 , (Elvander & Denton) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1021. 2007 ,
Web links