Flora of North America species comparison

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Micranthes subapetala

Yellowstone saxifrage
Habit Plants solitary or in clumps, with bulbils on caudices.
Leaves

basal;

petiole usually indistinct, flattened, ca. 2 cm;

blade ovate or elliptic to oblanceolate, 3–15 cm, fleshy, base cuneate, margins entire or minutely denticulate, ciliate, surfaces hairy.
Inflorescences

30+-flowered, ± constricted (spikelike) to ± open thyrses, 20–75 cm, yellow- to pink- (rarely purplish-) tipped stipitate-glandular.
Flowers

sepals reflexed, ovate;

petals absent, sometimes 1–5, pink to purplish, not spotted, elliptic, clawed, 1–2 mm, shorter than sepals;

filaments linear, flattened;

pistils connate to 1/2 their lengths;

ovary inferior.
Capsules

dark purple, valvate.
2n

= 76.

Micranthes subapetala
Phenology Flowering summer.
Habitat Subalpine and alpine meadows, wet banks, ledges
Elevation 1200-3000 m (3900-9800 ft)
Distribution
from FNA
ID; MT; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Although the species is usually distinctive, some populations of Micranthes subapetala in northern Wyoming appear more similar to M. hieraciifolia than to typical M. subapetala and may need to be re-evaluated. The distributional disjunction between the two taxa is about 1600 kilometers.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 66.
Parent taxa 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. 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. tempestiva, M. tenuis, M. texana, M. tischii, M. tolmiei, M. unalaschcensis, M. virginiensis
Synonyms Saxifraga subapetala, Saxifraga oregana var. subapetala, Saxifraga rydbergii
Name authority (E. E. Nelson) Small: in N. L. Britton et al., N. Amer. Fl. 22: 139. 1905 ,
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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