Euphorbia subgenus Chamaesyce in Canada and the United States exclusive of southern FloridaLouis C. Wheeler · First published 1941Open the Tome
Arizona plantsRobert H. Peebles, Louis C. Wheeler, Thomas H. Kearney · First published 1940Open the Tome
Some species of Notholaena, new and oldWilliam R. Maxon, Charles Alfred Weatherby, Lyman B. Smith, Robert C. Foster, Louis C. Wheeler · First published 1939Open the Tome
