Bibliografía (7 obras)
Botanical exploration of the trans-Mississippi west, 1790-1850
1956
Yuccas of the southwestern United States
1938
The Arnold Arboretum
1936
A verification of the occurrence of Yucca Whipplei in Arizona
1934
Taxonomic and cytological relationships of Yucca and Agave
1933
The lilac
1928
Syringa rugulosa, a new species from western China
1925
