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FNA | Family List | FNA Vol. 8 | Saxifragaceae | Saxifraga

21. Saxifraga rivularis Linnaeus, Sp. Pl. 1: 404. 1753.

Plants (delicate), loosely tufted or matted, (green to purple), stoloniferous, weakly rhizomatous, (with bulbils in axils of basal leaves). Leaves basal and cauline; petiole ± flattened, 2-30(-50) mm; blade reniform, 3-5(-7)-lobed (lobes rounded, sometimes ± obtuse, distalmost unlobed), (2.6-)3.7-5.2(-7.4) mm, slightly fleshy, margins entire, eciliate or sparsely glandular-ciliate, without lime-secreting hydathodes (with nonsecreting hydathodes at lobe apices), apex acute, surfaces glabrous. Inflorescences 2-3(-5)-flowered cymes, sometimes solitary flowers, (flowers pedicellate), 1.7-7 cm, glabrous or sparsely to ± densely tangled, pink-tipped stipitate-glandular; bracts (2-3), petiolate, (unlobed or 1-3-lobed, reduced). Flowers (hypanthium U-shaped in longisection); sepals erect, (sometimes rusty brown), elliptic to ovate, margins eciliate or sparsely glandular-ciliate, glabrous or sparsely to densely stipitate-glandular; petals white, sometimes pink tinged, not spotted, oblong to elliptic, 2-6 mm, to 2-3 times length of sepals; ovary 1/2 inferior.

Subspecies 2 (2 in the flora): n North America, n Eurasia.

Some reports of Saxifraga sibirica Linnaeus from Canada are misidentifications of this species.

1 Plants wholly green or purple only in inflorescences; hair crosswalls usually without color, rarely pale purple; inflorescences 2.7-7 cm, glabrous or sparsely stipitate-glandular; hypanthia sparsely short stipitate-glandular, hairs 0.1-0.3(-0.4) mm.   21a Saxifraga rivularis subsp. rivularis
+ Plants mostly purple (at least inflorescences); hair crosswalls purple; inflorescences 1.7-3 cm, sparsely to densely stipitate-glandular; hypanthia sparsely to densely long stipitate-glandular, hairs (0.2-)0.3-0.6(-1.1) mm.   21b Saxifraga rivularis subsp. arctolitoralis

Lower Taxa


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