A.Gray and A.Gray, ?Proc. Amer. Acad. Arts 10: 68. 1874?, 1874.

A.Gray and A.Gray, ?Proc. Amer. Acad. Arts 10: 65. 1874?, 1874.

A.Gray and ex A.Gray, (D. D. C. ), ?Proc. Amer. Acad. Arts 10: 66. 1874?, 1874.