BioStor
 | Noteworthy grasses from Mexico V Alan Beetle (1977) Phytologia 37: 317-407 |
 | Noteworthy grasses from Mexico XIII Alan Beetle (1988) Phytologia 63: 209-297 |
 | Taxonomy of Erigeron sect. Polyactis (Compositae: Astereae) G L Nesom (1989) Phytologia 66: 415-455 |