HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 289 
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174. Panicum leibergii (Vasey) Scribn. ¢/-5, aAr. pga ky ww, 
Panicum scoparium liebergit Vasey, U. 8. Dept. Agr. Div. Bot. Bull. 8: 32. 1889. 
‘“‘P. liebergii Scribn.)” is given as synonym, and ‘‘Plymouth County, Iowa (John 
Lieberg)” [error for Leiberg]is cited. The type, consisting of two vernal culms, is in 
Hitchcock’s herbarium. The accompanying label reads: ‘‘Panicum Leibergii, 
Scribn. 1884. Plymouth Co., Iowa. 1878. Legit John Leiberg,’’ the specific 
name, author, and date being in Scribner’s writing. On the sheet is written in Vasey’s 
hand, ‘‘P. scoparium var. Leibergii V.”’ 
Panicum scribnerianum leibergii Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 6: 
32. 1897. Nosynonym is cited and ‘“‘South Dakota: Brookings (Wilcox 16)” is the 
only specimen mentioned. Thisname must however be considered a new combina- 
tion based on P. scoparium leibergui Vasey. The Wilcox specimen agrees with that 
of Leiberg. 
Panicum liebergia Scribn. in Britt. & Brown, Illust. Fl. 3: 497. 1898. Based on 
“Panicum scoparium Lam. var. Liebergii Vasey.’’ This name was first mentioned 
as a synonym under P. scoparium liebergu Vasey.4 
DESCRIPTION. 
Vernal form dull green, in clumps of few to several slender culms, 25 to 75 cm. 
high, erect from a more or less geniculate base, pilose to merely scabrous; sheaths 
shorter than the internodes, papillose-hispid with spreading hairs; ligules almost 
obsolete; blades ascending or erect, rather thin, 6 to 15 cm. long, 7 to 15 mm. wide, 
' narrowed toward the rounded base, acuminate, papillose-hispid on both surfaces, 
often sparsely so above, papillose-ciliate from one-third to half their length; 
panicles finally long-exserted, 8 to 15 cm. long, less than half as wide, the flexuous 
branches narrowly ascending or somewhat spreading at anthesis; spikelets 3.7 to 4 
Fig. 325.—P. leibergii. From type specimen. 
mm. long, 1.8 to 2 mm. wide, oblong-obovate, turgid, strongly papillose-hispid with 
spreading hairs; first glume more than half the length of the spikelet, pointed, second 
glume and sterile lemma subequal, covering the fruit at maturity or the lemma slightly 
exceeding it; fruit 3 mm. long, 1.7 to 1.8 mm. wide, obovate-oval. 
Autumnal form more or less leaning, sparingly branching from the middle and lower 
nodes late in summer, the branches mostly simple, erect, the blades scarcely reduced, 
usually exceeding the short-exserted panicles. 
aU.S8. Dept. Agr. Div. Bot. Bull. 8: 32. 1889. 
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