Saxifraga sibirica L.

Saxifraga radiata Small
Saxifraga exilis Stephan ; Sternb. 1st Suppl. Rev. Saxifr. 8. 1822. Not 5". exilis Poll. 1816. Saxifraga elegans Sternb. Suppl. Rev. Saxifr. 2 : 34. 1831. Not 5". elegans Zeyh. 1824. Saxifraga sibirica Hook. Fl. Bor. Am. 1 : 246. 1832. Not S. sibirica I,. 1753,
Stems 18-28 cm. tall, sparingly glandular-pubescent, somewhat gregarious ; leaf -blades reniform or orbicular-reniform in outline, 11-22 mm. wide, those of the basal and lower cauline leaves long-petioled, 5-7-lobed, those of the upper cauline 3-5-lobed; flowers 2-7 together or solitary, none replaced by bulblets; hypanthium 3-3.5 mm. long at maturity; sepals oblong, 2-2.5 mm. long; petals oblong, 7-8 mm. long, clawless; follicles 7-8 mm. long.
Type locality : Siberia.
Distribution : Islands and mainland about Bering Sea.

Saxifraga laurentiana Seringe, in DC. Prodr. 4 : "6^. 1830
Saxifraga rivularis hyperborea Bugler, Monogr. Saxifr. 105. 1872.
Saxifraga rivularis pur pur ascens I^ange, Consp. Fl. Groenl. 62. 1880.
Stems 3-8.5 cm. tall, tufted, glabrous or finely glandular-pubescent ; leafblades reniform in outline, 3.5-12 mm. broad, thick, mainly 3-lobed, those of the stem-leaves sometimes entire, those of the basal and lower cauline long-petioled ; hypanthium 2-3.5 mm. long at maturity ; sepals ovate, 1.5-2.5 mm. long, obtuse ; petals oblong, sometimes broadly so, or oblong-cuneate, 'h-^ mm. long, clawless; follicles 6-6.5 mm. long.
Type locality : Lapland.
Distribution : Circumboreal, ranging southward in North America to the White Mountains, and in the Rocky Mountains to Montana.