Thaddeus Monroe Howard

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Hymenocallis imperialis, common name Big Fatty, is a plant species native to the Mexican states of San Luis Potosí and Hidalgo. It is also cultivated in other regions as an ornamental.

Hymenocallis guerreroensis T.M.Howard is a bulb-forming herb native to the Mexican states of Guerrero and Morelos. Common name "Guerrero spider-lily." It is sometimes cultivated for its showy white flowers.

Hymenocallis durangoensis is a plant species endemic to the Mexican state of Durango. It is a bulb-forming herb with white flowers.

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