SAXIFRAGES 507 



Saxifraga rotundifolia, L. 



Primary root as in last species. 



Hypocotyl subterranean, very short. 



Cotyledons minute, oblong-spathulate, obtuse, 2 mm. long, 1mm. 

 wide. 



Stem herbaceous with undeveloped internodes, throwing up 

 annual leafy flowering stems. 



Leaves simple, radical and cauline, alternate, exstipulate, petio- 

 late, hairy on both surfaces, pale green, paler beneath, often suffused 

 with red ; petioles terete, very hairy, dilated and sheathing at the 

 base. 



No. 1. Rotund, cuneate at the base, 2 mm. long, 2-25 mm. wide, 

 entire. 



Nos. 2 and 3. Rotund, subcuneate at the base, slightly longer 

 than broad, entire. 



No. 3. Rotund, subcuneate at the base, with a tooth on one side. 

 Other and numerous intermediate forms are reniform, entire or 

 triangled or trinerved at the base and crenate with three to five 

 rounded, broad teeth . 



Ultimate leaves reniform or rotund, deeply cordate at the base, 

 with rounded, more or less overlapping auricles, hairy on both sur- 

 faces, crenate-dentate, with broad, shallow, deltoid, obtuse, mucro- 

 nate crenatures or teeth, and broad, radiating, entire or forked 

 nerves. 



Mitella Breweri, A. Gray. 



Primary root slender, flexuose, giving off flexuose, branching 

 lateral rootlets. 



Hypocotyl terete, glabrous, reddish, about 3 mm. long. 



Cotyledons minute, ovate or oval, obtuse, subsessile, 2-25 mm. 

 long, 1-5 mm. wide. 



Stem herbaceous, very short, with stoloniferous branches. 



Leaves simple, radical, alternate, stipulate, petiolate, coarsely 

 hairy and glandular-pubescent, radiately nerved from the base, pale 

 green above, paler beneath ; petioles subterete, slightly channelled 

 above, coarsely hairy and pubescent. 



Nos. 1-3. Spathulate-rotund, or rotund with a cuneate base, 

 coarsely hairy and glandular-ciliate. 



First one 3 mm. long including the petiole, 2 mm. wide. Sue - 

 ceeding forms are small, reniform, entire or tridentate and tri- 

 nerved ; then five- to seven-nerved, and crenate, with obtuse 

 mucronate teeth. 



