Template:Howe and Underwood, 1903

• Howe, M. A. & Underwood, L. M. (1903) The Genus Riella, with Descriptions of New Species from North America and the Canary Islands. Bulletin of the Torrey Botanical Club 30 (4): 214–224, pls. xi-xii.  
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  • The Genus Riella, with Descriptions of New Species from North America and the Canary Islands (Q56249661)