and to indicate a few changes in the citation of authori- 
ties as well. No attempt will be made to reconcile all 
the kinds of sorghum grown in this country with one or 
another of Snowden’s species or varieties; nor to discuss 
the several nomenclatorial changes which he proposes. 
For the sake of clarity all the larger groups of Ameri- 
can Sorghums will be listed below, irrespective of whether 
or not any nomenclatorial changes are herein indicated. 
With the exception of the grass sorghums, they will be 
treated as varieties of Sorghum vulgare Pers., following 
the custom usual in this country. The several grass sor- 
ghums, on the other hand, will be considered as distinct 
species, a practice rather generally adopted in the United 
States as well as in Europe. 
THE CULTIVATED SORGHUMS IN THE UNITED STATES. 
1. Sorghum halepense / L. ) Persoon Syn. PI. 1 (1805) 
101. Johnson grass. 
Holcus halepensis Linnaeus Sp. Pl. (1758) 1047. 
2. Sorghum sudanensis ( Piper) Stapf in Prain FI. 
Trop. Afr. 9 (1917) 118. Sudan grass. 
Andropogon Sorghum Brot. var. sudanensis Piper 
in Proce. Biol. Soc. Wash. 28 (1915) 33. 
Holcus sudanensis L. H. Bailey Gentes Herb. 1 
(1923) 182. 
Sorghum vulgare Pers. var. sudanense (Piper) Hitch- 
cock in Journ. Wash. Acad. Sci. 17 (1917) 147. 
3. Sorghum virgatum ( Hack.) Stapf in Prain FI. 
Trop. Afr. 9 (1917) 111. Tunis grass. 
Andropogon Sorghum Brot. subsp. halepensis Hack. 
var. virgatus Hackel in DC. Monogr. Phan. 6 
(1889) 504. 
Holeus virgatus L.H. Bailey Gentes Herb. 1 (1923) 
182. 
