160 SAXIFRAGACEAE 



Fam. 4. PAENASSIACEAE Dumort. Grass-of-Parnassus Family. 

 1. PARNASSIA L. 

 1. Parnassia Caroliniana :Michx. Caroi^ina Grass-of-Parnassus. 

 (Man. p. 476 ; I. F. f. iS^2.) In swamps and low meadows, N. B. to 

 Man., Va., 111. and Iowa. — Penfisylvania : Northampton; Bucks; 

 Erie, Presque Isle. 



Famii^y 5. SAXIFRAGACEAE Dumort. Saxifrage Famii^y. 



Capsules 2-celled : placentae axile. i. Saxifraga. 

 Capsules i-celled : placentae basal or parietal. 



Placentae basal. 2. Tiarella. 

 Placentae parietal. 



Petals present : terrestrial plants. 



Stamens 5 : petals entire. 3. Heuchera. 



Stamens 10 : petals pinnatifid. 4. Mitella. 



Petals wanting: aquatic plants. 5. Chrysosplenium. 



1. SAXIFRAGA L. 



Filaments clavate. i. S. micrayithidifolia. 



Filaments subulate. 

 Scapes less than 3.5 dm. tall : leaf-blades short : cymules becoming- raceme- 

 like. 2. .S. Virginiensis. 

 Scapes over 4 dm. tall : leaf-blades elongated : cymules compact. 



3. 5". Pennsylvanica. 



1. Saxifraga micranthidifolia (Haw.) B.S.P. LETTUCE Saxifrage. 

 (Man. p. 479; I. F. y. iSj2.) In cold brooks, Pa., and along the 

 mountains to N. C. — Pennsylvania : Northampton ; Somerset, Laurel 

 Hill. 



2. Sazliraga Virginiensis Michx. Eari.y Saxifrage. (Man. p. 479 ; 

 I. F. /. 1833.) In dry and rocky woodlands, N. B. to Minn., Ga. and 

 Tenn. — Pennsylvania : Northampton ; Monroe ; Bucks ; Chester ; 

 Lancaster ; Huntingdon ; Delaware ; Allegheny. 



3. Saxifraga Pennsylvanica L. Pennsylvania or Swamp Saxi- 

 frage. (Man. p. 479; I. F. _/. 1831.) In swamps and on wet banks, 

 Me. to Minn., Va. and Mo. — Pennsylvania : Northampton ; Monroe ; 

 Lancaster ; Bucks ; Chester ; Lebanon ; Franklin ; Huntingdon ; 

 Somerset ; Delaware ; Allegheny. 



2. TIARELLA L. 

 1. Tiarella cordifolia L. CooLWORT. False Mitrewort. (Man. 

 p. 480; I. F. f. JS42.) In rich, moist woods, N. S. to Ont,, Minn., and 

 especially along the mountains to Ga., Ind. and Mich. — Pennsylvania : 

 Delaware ; Monroe ; Wayne ; Tioga ; Sullivan ; Blair ; Arm- 

 strong ; Fayettej Somerset; Erie; Allegheny. 



3. HEUCHERA L. 



Flower-stalks leafless. i. H. Americana. 



Flower-stalks leafy. 

 a. Hypanthium turbinate : stamens slightly if at all surpassing the petals. 



2. H. pubescens. 



