88 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
nom. Panici pruinosi.)” ‘The type, in the Berlin Herbarium, is labeled by Bernhardi 
‘Panicum pruinosum mihi, Delaware, affine P. virgato.’”’ The spikelets are 4.5 mm. 
long. 
Panicum giganteum Scheele, Linnaea 22: 340. 1849. ‘‘Im trockenen felsigen 
Flussbett des Cibolo zwischen San Antonio und Neubraunfels: Lindheimer. August.’ 
We have not seen the type, but in the Engelmann Herbarium is a specimen of P. 
virgatum collected by Lindheimer, which appears to be a duplicate type. It is 
labeled ‘‘Auf felsigen Boden im Bett der Cibolo. Sept.’’ 
Panicum glaberrimum Steud. Syn. Pl. Glum. 1: 94. 1854. ‘‘Cultum ex°H. Berol. 
sem. 1840. sub Ichnanthus glaber. Link.Am.sptr.’’ The type, in the Steudel Herba- 
rium, is labeled ‘‘Panicwm glaberrimum Steud. Cultum in H. Berol. comun. Hohen- 
acker.”’ f 
Ichnanthus glaber Link; Steud. Syn. Pl. Glum. 1: 94. 1854. This name is men- 
tioned under Panicum glaberrimum. 
Panicum kunthu Fourn.; Hemsl. Biol. Centr. Amer. Bot. 3: 490. 1885, not Steud. 
1841. Based on ‘‘Panicum coloratum Kunth, Enum. * * * not L.’’ Kunth 
refers ‘‘P. virgatum Muhl.”’ to P. coloratum L. as a synonym, probably basing this 
reference upon a note which Muhlenberg @ appends to his description of P. virgatum, 
““‘Non virgatum sed coloratum L.’ Smith.’’ The species described by Muhlenberg 
under this name is true P. virgatum L., and the specimen so labeled in the Muhlenberg 
Herbarium must be taken as the type of P. kunthii Fourn. Fournier intended to 
change the name of P. coloratum Kunth, not L., which must refer to the Muhlenberg 
species, as the other references are to P. coloratum L. Fournier’s later description ® 
of P. kunthii and the specimens cited refer to P. elephantipes. A synonym cited, 
P. arenarium [Brot. misapplied by] Schlecht., is P. gouini. 
Panicum ichnanthoides Fourn. Mex. Pl. 2: 30. 1886. This name was earlier listed 
without description by Hemsley.¢ Fournier cites ‘‘ Orizaba (F. Mtui[ER] n. 2082 
in herb. Petrop.)” The specimen in the herbarium of the Botanical Garden in 
St. Petersburg labeled as above is Miller 2002, the number as printed being an error. 
The panicle is narrow, the spikelets 3.5 to 3.8 mm. long. 
Panicum virgatum confertum Vasey, Bull. Torrey Club 18: 26. 1886. Vasey gives 
no definite locality, merely stating that the variety grows, “‘particularly on the sea 
coast.’? The type, in the National Herbarium, is labeled ‘‘Seashore at Atlantic 
City, N. J., Geo. Vasey, 1884.’’ The panicles are narrow and compact, about 20 cm. 
long and 5 cm. wide. The spikelets are about 3.5 mm. long. 
Panicum virgatum elongatum Vasey, Bull. Torrey Club 138: 26. 1886. No defi- 
nite locality is given. The type, in the National Herbarium, was collected at White 
River, South Dakota, August, 1892, by E. N. Wilcox, no. 13. This isan immature 
specimen, the long narrow panicle and slender spikelets, as described, being due to 
immaturity. This name is not based on P. elongatum Pursh, since Vasey says, ‘‘per- 
haps this is the Panicum elongatum of Pursh.”’ 
Panicum virgatum diffusum Vasey, Bull. Torrey Club 18: 26. 1886. ‘‘Sandy prai- 
ries, Kansas, Colorado, etc.’? No specimen bearing this name can be found in the 
National Herbarium nor any from Kansas or Colorado collected before 1886. Palmer’s 
no. 376 from Indian Territory in 1868, with a very large and diffuse panicle and 
marked ‘‘P. virgatum?’’ by Vasey well answers his brief description. 
DESCRIPTION. 
Plants erect, usually 1 to 2 meters high, producing numerous scaly, creeping root- 
stocks, glabrous throughout except as noted, commonly purple tinged, often glaucous, 
especially on the internodes and upper surface of the blades; culms in large to small 
clumps or even solitary, simple, robust, tough and hard; sheaths longer than the rather 
short lower internodes, usually shorter than the upper ones, often ciliate, sometimes 
a2 Descr. Gram. 120. 1817. c Biol. Centr. Amer. Bot. 3: 490. 1885. 
6 Mex. Pl. Gram. 2: 29. 1886. 
