Saxifraga hirculus

Copyright: Flora of North America Association

Plants loosely tufted, not stoloniferous or sometimes shortly so, rhizomatous, caudex present or not. Leaves basal and cauline, (distal clasping); petiole absent on distal leaves, otherwise ± flattened, 3–20 (–35) mm; blade linear or linear-oblanceolate to spatulate, unlobed, (5–) 10–30 mm, thin to slightly fleshy, margins entire, eciliate or sparsely reddish brown-ciliate, (with apical nonsecreting hydathode), apex acuminate or acute, surfaces glabrous or sparsely reddish brown-villous. Inflorescences 2 (–4) -flowered cymes, sometimes solitary flowers, (flowers initially nodding), 4–30 (–35) cm, sparsely to ± densely reddish brown-villous; bracts sessile. Flowers: sepals ascending to spreading, reflexed in fruit, (sometimes purplish), triangular, margins reddish brown-ciliate, surfaces glabrous (rarely reddish brown-hairy); petals yellow, often drying cream, often proximally orange-spotted, elliptic to oblong or obovate, 6–18 mm, 2+ times longer than sepals; ovary superior. 2n = 16, 24, 32.

Phenology: Flowering summer.
Habitat: Wet, usually mossy, arctic or alpine tundra, wet alpine meadows
Elevation: 0-4000 m

Greenland, B.C., Man., N.W.T., Nunavut, Ont., Que., Yukon, Alaska, Colo., Mont., N.Mex., Utah, Eurasia, Atlantic Islands (Iceland), Atlantic Islands (Spitsbergen)

Discussion

On the basis of a morphologic and cytologic study, O. Hedberg (1992) recognized four subspecies in Saxifraga hirculus: subsp. propinqua (2n = 16, 24), nearctic (Labrador and northwestern Greenland to Alaska); subsp. coloradoensis (2n = 16), Colorado; subsp. hirculus (2n = 32), circumboreal (Ontario to Alaska in North America); and subsp. compacta (2n = 32), mostly Arctic Eurasia, Atlantic Islands (Iceland, Spitsbergen), eastern Greenland, and Alaska. Nonetheless, we are not recognizing subspecies (see also P. K. Holmgren and N. H. Holmgren 1997); further research is needed to determine their validity.

Selected References

None.

Lower Taxa