Published in Madroño, in 1949, in volume 10, issue 2, pages 47-51

Created: 2016-02-15, modified: 2016-07-07

Published in Madroño, in 1950, in volume 10, issue 6, pages 166-176

Created: 2016-02-15, modified: 2016-07-07

Published in Acta Botánica Mexicana, in 2005, in volume 72, pages 65-76

Created: 2018-05-21, modified: 2018-05-21