300 
A. S. HITCHCOCK 
Stuntz has shown that the name Panicum glaucum L. should be 
appHed to pearl millet, the grass that has been called Pennisetum 
americanum (L.) Schum. Chaetochloa glauca Scribn. is a typonym 
of this. The grass that has been called C. glauca by recent authors 
should be known as C. lutescens. 
Pennisetum glaucum (L.) R. Br. Prodr. Fl. Nov. Holl. 195. 1810. 
Panicum glaucum L. Sp. PL 56. 1753. 
As indicated above the name Panicum glaucum was applied by 
Linnaeus to the grass we call pearl millet, now referred to the genus 
Pennisetum as P. spicatum, P. typhoideum or more recently as P, 
americanum (L.) Schum. Robert Brown transferred Panicum glau- 
cum to Pennisetum as P. glaucum. The plant he described was the 
species we have been calling Chaetochloa glauca but under the system 
of nomenclatorial types Pennisetum glaucum is a typonym of Panicum 
glaucum and the application of the name rests upon the identity of 
the latter species, independent of the species described when the 
transfer is made. 
ToRRESiA Ruiz & Pav. Syst. Veg. Peruv. Chil. 251. 1798. Savastana 
Schrank, Baier. Fl. i: 100 & 337. 1789, not Savastania Scop. 
Introd. 213. 1777. Hierochloe R. Br. Prodr. Fl. Nov. Holl. 208. 
1810. 
Hierochloe R. Br. is conserved by the Vienna Code but the earlier 
name Savastana Schrank has been used for this genus by botanists 
working under the American Code. The latter name is, however, 
invalidated by the earlier homonym Savastania Scop. (Melastoma- 
ceae). Scopoli gives a generic description but mentions no species. 
However as he cites Tibouchina Aubl. the genus Savastania Scop, is 
properly published. The next name available is Torresia Ruiz & Pav. 
This name was first used in an earlier work,^ but no species were given, 
so the name must date from 1798 where it is properly published with 
the type species T. utriculata Ruiz & Pav. The North American 
species are: 
Torresia alpina (Swartz). Holcus alpinus Swartz; Willd. Sp. PI. 4. 
937. 1806. 
Torresia macrophylla (Thurb.). Hierochloe macrophylla Thurb.; 
Boland. Trans. Calif. Agr. Soc. 1864-65: 132. 1866. 
^ Ruiz & Pav. Fl. Peruv. Chil. Prodr. 125. 1794. 
