SAXIFRAGACE^. 77 



usually only one low down on the stalk. Flower an inch 

 across, the petals much longer than the calyx. Beaver 

 meadows and wet banks. 



2. P. palustris, L. Sterile filaments 9-15 in each set. 

 Scapes 3-10 inches high. Flower nearly an inch across, the 

 petals not much longer than the sepals. Leaves cordate. 

 Sandy banks. 



3. P. parviflO'ra, DC. Petals but little longer than the 

 sepals. Sterile filaments about 7 in each set. Leaves ovate 

 or oblong. Atl. Prov. and northward. 



3. SAXIF'KAGA, L. SAXIFRAGE. 



1. S. Vjrglnien'sis, Michx. (EARLY SAXIFRAGE.) Stem 

 4-9 inches high. Scape clammy. Leaves obovate, crenate- 

 ly toothed. Petals white, oblong, twice as long as the sepals. 

 Rocks and hillsides. 



2. S. trieuspida'ta, Retz. Stems tufted, 4-8 inches high. 

 Leaves alternate, oblong or spathulate, with 3 rigid sharp 

 teeth at the end. Petals yellow. Chiefly N. and N.W. 



3. S. Aizo'on, Jacq. Scape 5-10 inches high. Leaves 

 thick, spathulate, with white finely-toothed margins. Petals 

 cream-colour, obovate, often spotted at the base. Moist 

 rocks, Atl. sea-coast and northward. 



4. MITEL' LA, Tourn. MITRE-WORT. BISHOP'S-CAP. 



1. M. diphyl'la, L. (TWO-LEAVED MITRE-WORT.) Stem 

 hairy. Leaves cordate, 3-5-lobed, those on the scape 2, op- 

 posite, nearly sessile. Flowers white, oblong. --Rich woods. 



2. M. nuda, L. (NAKED-STALKED M.) Stem small and 

 delicate. Leaves kidney-shaped, doubly crenate. Scape 

 leafless, few-flowered. Flowers greenish. Deep woods, on 

 moss-covered logs, etc. 



5. TIAREL'LA, L. FALSE MITRE-WORT. 



T. COrdifo'lia, L. Scapes leafless, 5-12 inches high. 

 Leaves heart-shaped, sharply toothed, sparsely hairy above, 

 downy beneath. Petals white, oblong. Rich- woods. 



