137 



26,. Bouteloua curtipendula. Gray, is B. racemosa^ Lagasca. 



27. Dactylocte?iium Aegyptiacicm, AVilld., is now Eteiisine Aegyptiaca, 



Pers. 



28. Leptochloa^ P, B., in North America is limited to Z. inncronata, 



Kunth, 



29. Triodia, Br., includes Uralepis and Windsoria of Nuttall and 



Tricuspis of Beauvois. 



30. Dtplachne^ Beauv., is separated from Leptochloa^ and includes our 

 L. fascicularis^ Gray, Z. duhia^ Nees., etc- 



31. Uralepis cornuta^ EIL, and Uralepis purpurea^ Nutt., are now 



32. 



species of Triplasis^ P- B. 

 Stenochloa of Nutall is Dtssanfhelium of Trinius. 



33. Catabrosa^ Beauv., is limited to C, aqnatica^ Beauv. 



34. Lophochlaena, Nees,, is made a synonym of Pleiiropogon^ Br. 



35. Brizopyrtan^ Link, is now restricted to a few African species. 



The American grasses which have been included in this genus 

 are now separated under Distichlis^ Rafinesque. 

 -Tfi. Airopis, Rupr,, raised to the rank of a genus in the Botany of 

 California, forms a section under Glyceria. 



37. Cerafochloa^ DC, separated from Bromus in the Botany of Cali- 

 fornia, is again referred to that genus, forming the fourth section, 



38. Agropyrum^ Gaertn., includes A. repens, A. junceum^ A. canim/m, 

 etc., the genus Triticiim being restricted to the cultivated wheats, 

 on the one hand, but made to embrace the species of Aegilops on 

 the other. 



39. Elymus Europaeus^ Lin., is Ilordeum sylvaticuniy Huds. 



40. Asprella^ Willd., has precedence, from priority, over Gymnosii- 

 chum. 



Girard College, Philadelphia. F. Lamson Scribner. 



Some Phenomena connected with the Cambium-Layer.— TJie 



accompanying cut, which we borrow from our French contemporary 



young wood- 



Nature 



cells constituting the cambium-layer are capable of accomplishing 

 when a foreign organism chances to be introduced into their midst. 



The object represented is a small Brazilian reptile — the jaracaca 

 which was found within the trunk of an ip^-mirim, a tree of common 

 occurrence in the province of Matto Grosso, to the north of the 



