By Williams, Louis Otho, 1908- . Genre Scrophylariaceae . Names scrophulariaceae / s f / verbenaceae / schlegelia / bignoniaceae and 102 more

By Williams, Louis Otho, 1908- . Genre nc----- / Botany / Central America / Tropical plants / Central America . Names leaves / type / corolla / flowers / mexico and 945 more

By Williams, Louis Otho, 1908- . Genre n-mx--- / nc----- / Hoffmannia / Botany / Mexico and 2 more . Names corolla / hoffmannia / type / calyx / molina and 250 more

By Williams, Louis Otho, 1908- . Genre nc----- / Botany / Central America . Names plants / american / flowers / corolla / leaves and 597 more

By Williams, Louis Otho, 1908- / Standley, Paul Carpenter, 1884-1963 . Genre Standley, Paul Carpenter1884-1963 . Names la / plants / costa / una / america and 949 more

By Williams, Louis Otho, 1908- . Genre Botany / Neotropics . Names america / mexico / type / american / plants and 1700 more

By Standley, Paul Carpenter, 1884-1963 / Williams, Louis Otho, 1908- / Nash, Dorothy L. . Genre ncgt--- / Botany / Guatemala . Names calyx / corolla / leaves / seeds / flowers and 9412 more

By Williams, Louis Otho, 1908- . Genre nc----- / Botany / Central America . Names leaves / mexico / american / america / flowers and 971 more

By Standley, Paul Carpenter, 1884-1963 / Williams, Louis Otho, 1908- . Genre ncgt--- / Botany / Guatemala . Names flowers / plants / leaves / fruit / america and 4166 more

By Standley, Paul Carpenter, 1884-1963 / Williams, Louis Otho, 1908- . Genre ncgt--- / Rubiaceae / Guatemala / Botany / Guatemala . Names leaves / corolla / calyx / flowers / mexico and 16991 more