1912.] NATURAL SCIENCES OF PHILADELPHIA. 529 



J79. Gyrostachys gracilis (Bigel.) Kuntze. Add: 

 Delaware. — Wawa. 

 Chester. — Sugartown Barrens. 



Insert : 

 79a. Leptorchis liliifolia (L.) Kuntze. 

 Occasional on moist shaded banks. 

 Chester. — Cedar Barrens; Unionville. 



80. Leptorchis loeselii (L.) MacM. Add: 

 Chester. — Nottingham Barrens. 



*90. Quercus marylandica Muench. 

 Hybridizes freely with other species. 

 Q. marylandica x velutina t 

 Delaware. — Middletown Barrens. 

 Q. marylandica x stellata ? 

 Delaware. — Williamson. 

 Chester. — Nottingham Barrens (B. Long). 



|92. Quercus stellata Wang. Add: 

 Newcastle.— Centerville (A. Commons) . 



f94. Quercus prinoides Willd. Add: 

 Newcastle. — Centerville (A. Commons) . 

 Q. prinoides x alba f 

 Chester. — Unionville. 



|95. COMANDRA UMBELLATA (L.) Nutt. Add: 



Delaware. — Mineral Hill; Wawa. 

 Chester. — Paoli. 



*97. Talinum teretifolium Pursh. Add: 

 Chester. — Unionville. 



Newcastle. — Centerville (A. Commons). 



*99. Cerastium oblongifolium Torr. Add: 

 Chester. — Marshallton (B. Long). 

 Newcastle. — Centerville; Mt. Cuba (A. Commons). 



*100. Arenaria stricta Michx. Add: 



Newcastle. — Centerville (A. Commons). 



102. Thalictrum revolutum D. C. Add: 

 Delaware. — Wawa (leaves glandular-puberulent beneath). 



