19312 Hubbard,— Nomenclatorial Changes in Gramineae. 171 
Art. 50) P. minutulum Gaud. does not invalidate P. minutulum Desv., 
which consequently replaces P. Wrightianum Scribn. 
PANICUM MINUTULUM Desv. Opusc. 87 (1831) not Gaud. l. c. (1826). 
Synonymy in part: P. Wrightianum Scribn. U. S. Div. Agrost. Bull. 
11:44, fig. 4 (1898) & Hitche. & Chase Contr. Nat. Herb. 15 : 207 
(1910); Sinnott in Ruopora 14 : 29 (1912). 
For complete synonymy cf. Hitche. & Chase I. c. 
PANICUM HUACHUCAE Ashe Var. siLvicoLA Hitche. & Chase. 
According to the American Code this name is correct, but by the 
* Vienna Code” (Sect. 6, Art. 48) the varietal name fasciculatum (P. 
dichotomum L. var. fasciculatum 'Torr.) must be retained, as the fact 
that there is a species of the same name (P. fasciculatum Sw.) does not 
make the use of fasciculatum as a varietal name invalid. The valid 
name, consequently, becomes 
PANICUM HUACHUCAE Ashe var. fasciculatum (Torr.) comb. nov. 
Synonymy in part: P. dichotomum L. var. fasciculatum 'Torr. Fl. No. 
& Mid. U. S. 145 (1824). P. huachucae Ashe var. silvicola Hitche. & 
Chase in Robinson in Ruopona 10 : 64 (1908); Hitchc. in Gray Man. 
ed. 7, 109 (1908); Hitche. & Chase Contr. Nat. Herb. 15 : 216 (1910). 
For complete synonymy cf. Hitche. & Chase l. c. 
PANICUM COLUMBIANUM Scribn. 
The oldest name of this species is P. heterophyllum Bose in Nees 
Agrost. Bras. 227 (1829). "This is the first synonym given by Hitch- 
cock and Chase, Contr. Nat. Herb. 15:247 (1910). The specific 
name Aeterophyllum is invalid, according to the American Code, as 
there are older usages of heterophyllum, but these usages do not invali- 
date its use, according to the * Vienna Code" (Sect. 7, Art. 50) since 
two are reduced to synonymy and the third is a nomen nudum (Sect. 
4, Art. 37). 
P. heterophyllum Spreng. Neue Entdeck. 3:13 (1822) equals P. 
pilosum Sw. Prodr. 22 (1788) [cf. Ind. Kew 2 pt. 1:414 (1895)]. 
Steudel Nom. Bot. ed. 2, 2:261 (1841) under P. pilosum Sw. gives 
Setaria pilosa Kunth as a synonym and Kunth Rev. Gram. 1 : 47 
(1829) under Setaria pilosa gives P. pilosum Sw: and P. heterophyllum 
Spreng. as synonyms. I cannot find that, at any time since Kunth, 
anyone has used P. heterophyllum Spreng. otherwise than as a synonym 
