HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 18] 
Spikelets 2.2 mm. or more long, pointed; 
sheaths bearing pale glandular 
SOS eg ANE Ae Se ADR SN pe OO lll. P. yadkinense. 
Spikelets not over 2 mm. long, not 
pointed. 
Autumnal form erect, branched 
like a little tree; primary 
blades rarely over 5mm. wide; 
second glume shorter than 
fruit and sterile lemma....-. 109. P. dichotomum. 
Autumnal form topheavy-reclining; 
primary blades 6 to 10 mm. 
wide; second glume equaling 
fruit and sterile lemma...... 110. P. barbulatum. 
V102. Panicum microcarpon Muhl. 
Panicum microcarpon Muhl.; Ell. Bot. S. C. & Ga. 1: 127. 1816. No locality is 
cited. The type, in the Elliott Herbarium, consists of a single culm, lacking the 
base, with five leaves and an immature panicle, slightly included at the base. The 
accompanying label reads: ‘‘Panicum microcarpon. barbulat: var.? Hab. Georg: 
Dr. Baldwin.’’ As shown by his description and the above-mentioned type, Elliott 
misunderstood Muhlenberg’s application of this name and attached it to a different 
species, though giving Muhlenberg as author. Muhlenberg’s later publication of the 
name @ for a different species ® is thus invalidated. 
Panicum nitidum ramulosum Torr. Fl. North. & Mid. U.S. 146. 1824. ‘‘Near 
Quaker-Bridge, New-Jersey.’’ The type, in the Torrey Herbarium, is a sparingly 
branched, vernal culm, with nearly mature terminal panicle. The label reads: 
“Panicum nitidum # var. [8 is ramulosum] collected in swamps in the pine barrens 
of New Jersey, near Quaker Bridge, June, 1818.” 
2Panicum nitidum barbatum ‘Torr. Fl. North. & Mid. U. 8. 146. 1824. ‘‘In 
woods and meadows.’’ The type could not be found in the Torrey Herbarium. The , 
description seems to apply to the vernal form of P. microcarpon, or possibly to P. 
barbulatum. 
This species is the one described by Muhlenberg ¢ under the name of P. discolor 
Spreng., as shown by a specimen so labeled in the Muhlenberg Herbarium. Panicum 
heterophyllum Schreb. is here cited as a synonym, erroneously, as Schreber did not 
publish this name. JP. heterophyllum Muhl.4 is a nomen nudum. 
Panicum microcarpon Muhl. is the species described as P. barbulatum by American 
authors, which proves to be not P. barbulatum Michx. 
DESCRIPTION. 
Vernal form cespitose; culms erect, or sometimes geniculate at base, 30 or usually 
60 to 100 cm. high, the nodes densely bearded with reflexed hairs; sheaths glabrous, 
or the lowermost pubescent, often mottled with white spots between the nerves, 
ciliate on the margin; blades thin, spreading, the upper often reflexed, 10 to 12 cm. 
long, 8 to 15 mm. wide, narrowed toward the base, glabrous, more or less papillose- 
ciliate at base; panicles finally long-exserted, many-flowered, ovate in outline, 8 to 
12 cm. long, the branches ascending; spikelets 1.6 mm. long, 0.7 mm. wide, elliptic, 
@ Descr, Gram. 111. 1817. 
56 See P. microcarpon Muhl. under P. polyanthes, page 255. 
¢ Descr. Gram. 114. 1817. 
@ Trans. Amer. Phil. Soc. 3:160. 1793. 
