174 SAXIFRAGACEAE. [Vor.. Il. 
10. Saxifraga micranthidifolia 
(Haw.) B.S.P. Lettuce Saxi- 
frage. (Fig. 1832.) 
Robertsonia micranthidifolia Haw. Syn. Pl. 
Suce. 322. 1812. 
Saxifraga erosa Pursh, Fl. Am. Sept. 311. 1814. 
Saxtfraga micranthidifolia B.S.P. Pre. Cat. 
N. ¥Y. 17. 1888. 
Scape rather slender, more or less viscid, 
1°-3° high, bracted above. Leaves oblance- 
_olate or oval, sometimes 1° long, obtuse at 
the apex, tapering downward into a long 
margined petiole, coarsely and sharply den- 
tate; panicle loose, elongated; flowers white, 
regular, 2’’-3’’ broad; calyx-lobes reflexed, 
slightly shorter than the oval or oblong ob- 
tuse petals; calyx-tube free from the ovary; 
filaments club-shaped; follicles lanceolate, 
sharp-pointed, 2/’-3/’ long, their tips at 
length divergent. * A a 
In cold brooks, Bethlehem, Pa., south along 
the mountains to North Carolina. Ascends to 
5500 ft. in North Carolina, May-June. 
11. Saxifraga Virginiénsis Michx. Early Saxifrage. (Fig. 1833. ) 
Saxifraga Virginiensis Michx. Fl. Bor. Am.- 1: 
269. 1803. 
Scape viscid-pubescent, 4’—12’ high, naked, or 
with a few bracts at the base of the pedicels. 
Leaves obovate, or oval with a spatulate base, 
narrowed into a margined petiole, dentate or 
crenate, obtuse or acutish at the apex, 1/—3/ 
long or longer; inflorescence cymose, at length 
loose and paniculate with the lower peduncles 
elongated; flowers white, regular, 2’’—3/’ broad; 
calyx-lobes erect, triangular or triangular-ovate, 
much shorter than the oblong-spatulate, obtuse 
petals; ovary nearly free from the calyx; carpels 
nearly separate, the follicles at length widely 
divergent, often purplish. 
In dry or rocky woodlands, New Brunswick to 
Minnesota, south to Georgia and Tennessee. As- 
cends to 3500 ft. in Virginia. March-May. Forms 
with 15 stamens occur on New York Island, and 
with green petals in Essex Co., Mass. 
12. Saxifraga nivalis L. Clustered Alpine 
Saxifrage. (Fig. 1834.) 
Saxtfraga nivalis I. Sp. Pl. gol. 1753. 
Resembling the preceding species but commonly lower, 
seldom over 6’ high. Scape viscid, naked, or bracted at 
the base of the capitate sometimes branched inflorescence; 
leaves ovate or oval, narrowed into a margined petiole, 
thicker; flowers white, 3’’-5’’ broad, in a compact cluster; 
calyx-lobes ovate or oblong, spreading, obtuse, about one- 
half the length of the oblong or oblong-ovate petals; ovary 
half-inferior; follicles deep purple, divergent. 
Labrador and arctic America, south in the Rocky Moun- 
tains to Arizona. Also in northern and alpine Europe and 
Siberia. Summer. Said to flower heneath the snow. 
