26 JOURNAL OF THE ARNOLD ARBORETUM [vol. iv. 



low swampy woods, perhaps being more abundant here than anywhere 



else in its range. 



Robinia Pseudoacacia L. Found in thickets along the escarpment and 

 on bluffs and ridges near McNab, where it is certainly native. 



Sophora affinis T. & G. This interesting southern tree is growing 

 sparingly along gravelly ridges above the sandstone in the hills near 

 McNab. The trees flower and fruit freely and some of them attain nearly 



the maximum size for the species. 



Amorpha fruticosa L. Growing in open situations in low woods and 



along the margins of swamps and bogs. 



Amorpha paniculata T. & G. A species of eastern Texas that has been 

 found growing in sandy bogs near McNab. 



Wisteria macrostachya Nutt. A high climbing vine of sandy bogs and 



low sandy woods. 



Acacia angustissima (Mill.) Ktze. This little shrub, of which the base 



only is usually woody, has been found in thickets and barrens. 



RUTACEAE 



Zanthoxylum Clava-IIerculis L. Rather infrequent in thickets and open 

 woods, on eroded hillsides along the escarpment and in the sand hills. 

 Ptelea trlfoliata L. Thickets and open hillsides along the escarpment. 



ANACARDIACEAE 



Rhus Toxicodendron L. Common everywhere in woods and thickets. 

 Rhus quercifolia (Michx.) Steud. A low shrub, usually not more than 

 half a meter tall, growing in sandy soil of the Cretaceous area. 

 Rhus glabra L. Occasionally found in thickets and open woods. 

 Rhus copallina L. On the bluff at McNab and sometimes found else 



where in flat open woods. 



AQUIFOLIACEAE 



Ilex opaca Ait. Sandy woods and banks of small streams in the Cre- 

 taceous area. 



Ilex decidua Walt. A common species, sometimes becoming a small 

 tree, growing in low woods and also in openings and thickets in the uplands. 



Ilex caroliniana (Walt.) Trel. This species has been found growing 

 along the north side of the bluff at McNab. 



CELASTRACEAE 



Evonym us atropurpurcus Jacq. Rarely found in open woods and thickets 



in the uplands. 



Evonym us americana L. On moist sandy banks and in woods along 



small creeks in the Cretaceous area. 



ACERACEAE 



Acer saccharum var. glaucum Sarg. A common tree in the sand hills 

 section, especially on hillsides and along small streams. 



Acer floridanum Pax. Abundant in low sandy woods in the Cretaceou 



area. 



