Palmer — Flora of the Grand Falls Chert Barrens. 109 



PORTULACACEAE. 



Claytonia virginica L. Common in dry soil. 



Talinum parviflorum Nutt.* Very local, but not uncommon in thin 

 soil, early wet but soon dry- 



Talinum calycinum, Engelm.* Common with last and somewhat more 

 widely distributed. 



Portulaca pilosa L.* Common in thin soil, early wet but soon dry. 



Ranunculaceae. 



Ranunculus micranthus Nutt. Common in dry soil. 

 Ranunculus fascicularis Muhl. Common throughout in dry soil. 



Lauraceae. 

 Sassafras variifolium (Salisb.) Ktze. Occasional on knolls. 



Cruciferae. 



Draba brachycarpa Nutt. Common in dry soil. 

 Selenia aurea Nutt.* Common in thin dry soil throughout. 

 Arabis laevigata (Muhl.) Poir. Frequent on cliffs and ledges. 

 Arabis canadensis L. Occasional with last. 



Crassulaceae. 



Sedum Nuttallianum Kaf.* Common in thin soil, early wet but 

 soon dry. 



Sedum pulchellum Michx. Not so common as last, in similar situ- 

 ations. 



Saxifragaceae. 



Saxifraga texana Buckley.* Frequent in dry soil. April. 

 Heuchera hirsuticaulis (Wheelock) Rydb. Uncommon on cliffs and 

 ledges. 



Ribes missouriensis Nutt. Frequent along shelves and ledges. 



ROSACEAE. 



Amelanchier canadensis (L.) Medic. Frequent on knolls and along 

 edges of cliffs. 



Crataegus macropoda Sarg. Frequent on knolls and in dry soil. 



Crataegus furcata Sarg. Common with last. 



Crataegus magnifolia Sarg. Uncommon along ledges. 



Rubus villosus Ait. Frequent in dry soil and on knolls. 



Rubus nigrobaccus Bailey. Frequent on cliffs and ledges. 



Rosa setigera Michx. Frequent on knolls. 



Prunus serotina Ehrh. Occasional on knolls and ledges. 



Prunus americana mollis T. & G. This or another species, perhaps 

 more than one, occurs along ledges. 



