Published in Annals of the Missouri Botanical Garden, in 1973, in volume 60, pages 478-563
Created: 2010-01-08, modified: 2015-12-16![](https://www.biodiversitylibrary.org/pagethumb/16159521,60,60)
Published in Annals of the Missouri Botanical Garden, in 1972, in volume 59, pages 279-281
Created: 2010-01-08, modified: 2015-12-16![](https://www.biodiversitylibrary.org/pagethumb/628818,60,60)
Published in Rhodora, in 1964, in volume 66, issue 765, pages 32-46
Created: 2014-06-16, modified: 2016-07-26