GENUS 4. 



SAXIFRAGE FAMILY 



4. Micranthes pennsylvanica (L.) 



Haw. Pennsylvania or Swamp 



Saxifrage. Fig. 2159. 



S. pennsylvanica L. Sp. PI. 399. 1753. 

 Saxifraga Forbesii Vasey, Am. Entom. & Bot. 



2: 288. 1870. 

 M. pennsylvanica Haw. Saxifr. Enum. 45. 1821. 



Scape stout, terete, viscid-pubescent, 

 l-3$ high, bracted at the inflorescence. 

 Leaves large, oval, ovate, obovate or ob- 

 lanceolate, pubescent or glabrate, 4'-io' 

 long, i $'-3' wide, obtuse at the apex, nar- 

 rowed at the base into a broad petiole, the 

 margins denticulate or repand ; cymes in an 

 elongated open panicle; flowers greenish, 

 regular, ij"-2i" broad; calyx-tube nearly 

 free from the ovary, its lobes ovate, ob- 

 tusish, reflexed, one-half shorter than the 

 lanceolate or linear-lanceolate petals ; fila- 

 ments subulate or filiform; follicles ovoid, 

 their tips divergent when mature. 



Swamps and wet banks, Maine to Ontario, 

 Minnesota, Virginia, Iowa and Missouri. May. 



5. Micranthes micranthidifolia (Haw.) 

 Small. Lettuce Saxifrage. Fig. 2160. 



Robertsonia micranthidifolia Haw. Syn. PI. Succ. 



322. 1812. 



Saxifraga erosa Pursh, Fl. Am. Sept. 311. 1814. 

 5 1 . micranthidifolia B.S.P. Prel. Cat. N. Y. 17. 1888. 

 M. micranthidifolia Small, Fl. SE. U. S. 501. 1903. 

 Scape rather slender, more or less viscid, 

 i-3 high, bracted above. Leaves oblanceo- 

 late or oval, sometimes i 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. 



In cold brooks, Bethlehem, Pa., south along the 

 mountains to North Carolina. May-June. 



6. Micranthes caroliniana (A. Gray) 

 Small. Gray's Saxifrage. Fig.2i6i. 



Saxifraga caroliniana A. Gray, Mem. Am. 



Acad. 3: 39. 1846. 

 Saxifraga Grayana Britton, Mem. Tprr. Club 



5: 178. 1894. 

 M. caroliniana Small, N. A. Flora 22 2 : 146. 1905. 



Glandular-pilose all over, scapose from 

 a corm-like rootstock, scape 6'-i8' tall. 

 Basal leaves clustered, oblong, oval or 

 nearly orbicular, i'-s' long, crenate-den- 

 tate, narrowed into margined petioles, 

 mostly shorter than the blade and dilated 

 at the base ; inflorescence cymose-panicu- 

 late, ample; bracts spatulate or lanceolate; 

 flowers white, 4"-$" broad ; calyx-tube 

 adnate to the ovary, its segments ovate- 

 oblong, reflexed, obtuse ; petals ovate or 

 oblong-ovate, obtuse, 2-spotted, narrowed 

 into a slender claw ; filaments club-shaped ; 

 follicles oblong, 2" -3" long, united only 

 at the base, diverging; styles subulate. 



In rocky situations, mountains of Virginia and North Carolina. 



June-July. 



