SAXIFRAGACEAE. 169 



Family 4. PARNASSIACEAE Dumort. Grass of Parnassus Family. 



1. PARNASSIA L. 

 1, Parnassia Caroliniana Michx. Grass of Parn-assus. M. p. 476. Wet 

 banks. Summer. 

 Bucks— (P.). Lehigh— Black Eiver bog (Kr.). Northampton — lias- 

 ton, A. P. Garber (B. C). 

 Ocean— New Egypt (C). 



Family 5. SAXIFRAGACEAE Dumort. Saxifrage Family. 



Placentae axial. 1. Saxifraga. 



Placentae almost basal. 2. Tiarella. 

 Placentae parietal. 



Petals present ; terrestrial plants. 



Petals entire. 3. Heuchera. 



Petals lobed or pinnatifid. 4. Mitella. 



Petals none ; small aquatic plants. 5. Chrysosplenium. 



1. SAXIFRAGA L. Saxifrage. ^ d 



Plants large, 3-10 dm. tall, growing in wet places. 



Leaves merely denticulate or repand; follicles ovoid. 



1. S. Pennsylvanica. 

 Leaves coarsely and sharply dentate; follicles lanceolate. 



2. S. micranthidifolia. 

 Plants low, 5-45 cm. tall, growing in dry or rocky places. 



3. S. Virginiensis. 



1. Saxifraga Pennsylvanica L. Swamp Saxifrage. M. p. 479. Bogs. 



Spring. 



2. Saxifraga micranthidifolia (Haw.) B. S. P. Lettuce Saxifrage. M. p. 



479. Cold mountain brooks. Spring. 

 Lehigh— AUentowa, A. P. Garber (B. C), Idlewild, Lehigh Mountain 

 (Kr.). iV^orf /lampoon— Bethlehem, Dr. J. B. Brinton (He.). 



3. Saxifraga Virginiensis Michx. Early Saxifrage. M. p. 479. Exposed 



rocks and dry hillsides. Early spring. 



2. TIARELLA L. 

 1. Tiarella cordipolia L. False Mitrewort. M. p. 480. Moist woods. 

 Early spring. 

 Delaware — Crum Creek, James Howard (Fu.). 



3. HEUCHERA L. Alum-root. 



Stem with 1-3 leaves. 1. H. Curtisii. 



Stem strictly scapose. 2. H. Americana. 



1. Heuchera Curtisii T. & G. M. p. 481. Rich woods. Spring. 



Lancosfer — Lancaster, Mart. (B. C), Safe Harbor (Ca.), York Fur- 

 nace (Cr.). 



2. Heuchera Americana L. M. p. 482. Rocky woodlands. Summer. 



4. MITELLA L. 



1. Mitella diphylla L. Mitrewort, Bishop's-cap. M. p. 483. Rich 

 woods. Spring. 



