Per Axel Rydberg

The section Tuberarium of the

The section Tuberarium of the genus Solanum in Mexico and Central America

1924

Notes on Fabaceae

Notes on Fabaceae

1923

Astragalus and its segregates

Astragalus and its segregates as represened in Colorado

1906

On the American black cottonwo

On the American black cottonwood

1893