HITCHCOCK AND CHASE—TROPICAL NORTH AMERICAN PANICUM. 525 
108. Panicum albomaculatum Scribn. 
Panicum albomaculatum Scribn. U. 8. Dept. Agr. Div. Agrost. Cire. 19: 2. 1900; 
Contr. U. 8. Nat. Herb. 15: 311. 1910. 
Autumnal form leaning or ascending, with geniculate nodes, branching from the 
lower and middle nodes, the branches nearly as long as the primary culm, erect, 
simple or sparingly branching, the sheaths overlapping, the blades scarcely reduced, 
the panicles short-exserted; apparently no winter rosette developed. 
One specimen, Hitchcock 6979, has harshly pilose foliage, but in all other respects its 
characters are those of P. albomaculatum. 
DISTRIBUTION. 
Shady banks and wooded slopes, 
Mexico and Guatemala. The type 
specimen from Patzcuaro. 
Jauisco: Zapotlan, Hitchcock 7170, 
Amer. Gr. Nat. Herb. 193. 
MicHoacdn: Patzcuaro, Pringle 
5203. Urudpan, Hitchcock 
6979. Jorullo, Humboldt 
(Willd. Herb.). 
GuATEMALA: Antigua, Hitchcock 9139. 
Fig. 134.—Distribution of P. albomaculatum. 
CORDOVENSIA. 
Plants perennial, straggling, the culms decumbent at base, rooting at the nodes; 
ligules membranaceous, minute; spikelets elliptical, the first glume two-thirds the 
length of the spikelet or more; fruit smooth and shining, apiculate. 
This group, to which are apparently allied the South American Panicum phragmites 
Nees (P. discolor Trin., not Spreng.) and P. ovuliferum Trin., appears to be inter- 
mediate between true Panicum and the subgenus Dichanthelium, having the sterile 
primary panicles and secondary panicles with fruitful, probably cleistogamous, 
spikelets, but not forming a winter rosette. 
lants glabrous or the leaves sparsely pilose .......----------- 109. P. cordovense. 
Piaitemelyety pubescent, eee ee eee ee ea 110. P. chiriquiense. 
109. Panicum cordovense Fourn. 
Panicum cordovense Fourn. Mex. Pl. 2: 26. 1886. ‘‘Cordova (Schaffn. n. 293 in 
herb. Franq.).’’ The type specimen in the herbarium of Drake de Castillo, now a 
part of the herbarium of the Jardin des Plantes, Paris, has glabrous spikelets (like 
that shown in Fig. 135). This in the Revision was listed among the doubtful species. 
Panicum expansum Fourn. Mex. Pl. 2: 26. 1886 (following P. cordovense). ‘‘Huita- 
malco (Liebm. n. 426).’’ The type specimen, in the Copenhagen Herbarium, has a 
large immature primary panicle, the spikelets glabrous. In the Revision ? it was 
suggested that this unknown species was related to P. costaricense. 
Ichnanthus apiculatus Scribn. U. S.- Dept. Agr. Div. Agrost. Cire. 80: 1. 1901. 
““T'ype specimen from near Jalapa, State of Vera Cruz. C.G. Pringle, no. 9208.’’ In 
the type specimen, in the United States National Herbarium, the spikelets are 
glabrous. 
Panicum missionum Ekman, Ark. for Bot. 114: 19. pl. 3. f.1. 1912. ‘‘Bonpland, ~ 
ad rivulum prope praedium ‘Almacén finlandesa,’ 26. 12. 07. N. 632.’’, collected by 
E. L. Ekman, in the State of Misiones, Argentina. An immature specimen of the 
type collection is in the U. 8. National Herbarium, received from Dr. Ekman. The 
1 Contr. U. S. Nat. Herb. 15: 329. 1910. 
2 Contr. U. 8S. Nat. Herb. 15: 134. 1910. 
