

THE IDENTIFICATION OF WALTER S GRASSES. 



53 



No specimen in the herbarium. Probably Trisetum 

 Pennsylvanicum B.S.P. (Avena Pennsylvanica L.). 

 Pursh refers it to Avena palustris Michx., which is the 

 same as A. Pennsylvanica L. Walter has cut out of 

 Linnaeus' description of A. Pennsylvanica all after 

 attenuata. 



48. Arundo. Cal. 2-valvis, brevis, inaequalis. Cor. 2- 



valvis : valvis basi ventricosis, apice acutis 

 (Jlosculis nee I ana cinctis). 



gigantea 1. calycibus 5 ad 10-floris, panicula laxa; fol. 



f auce setosis ; stipulis internodiis dimidio 

 brevioribus, marcescentibus. 



There is a specimen in the herbarium consisting of a 

 shoot with two mature leaves, the sheaths bearded at 

 the throat. It is Arundinaria gigantea Nutt. 





tecta 2. 



cidmis tectis stipulis internodios superantibus, 

 foliis fauce setosis. 



No specimen in the herbarium. Is Arundinaria tecta 



Muhl. 



49. Hordeum. Cal. 2-valvis, lateralis, uniflorus, ternus. [P. 82] 



nodosum? 

 1. 



flosculis lateralibus masculis setts brevibus, 

 involucellis setaceis laevibus. Setis longi- 

 tudine florum. 



The specimen in the herbarium is Elymus Virginicus 

 L., the long-awned form with somewhat hairy flowering 

 glume. Linnaeus' description of H. nodosum has been 

 altered. 



50. Cynosurus. Cal. 2-valvis, floribus variis. Receptac- 



ulum proprium unilaterale. 



