312 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
DISTRIBUTION. 
Known only from type locality. 
Mexico: Patzcuaro, State of Michoacan, Pringle 5203. 
Latifolia.—Culms rather stout, usually more than 50 cm. high; ligules not over 1 mm. 
long; blades ample, usually more than 1.5 cm. wide, cordate; spikelets 2.7 to 4.5 
mm. long, rather turgid, pubescent, 7 to 9-nerved. Autumnal form not very 
freely branching. 
Sheaths strongly papillose-hispid, at least the lower and those 
olethe branches 72/1 Ni pee ier a area yates ire pees ea 189. P.clandestinum. 
Sheaths glabrous or softly villous. 
Nodes glabrous; spikelets 3.4 to 3.7 mm. long ....--..-.---- 190. P. latifolium. 
Nodes bearded; spikelets 4 to 4.5 mm. long. 
Blades glabrous or nearly so on both surfaces........--- 191. P. boscii. 
Blades welvety beneath ys -50 9 12 oe ee eee 19la. P. boscii molle, 
Vi 189. Panicum clandestinum L. 
Panicum clandestinum L. Sp. Pl. 58. 1753. ‘‘ Habitat in Jamaica, Pensylvania. 
Kalm.’’? In the Linnean Herbarium is a specimen marked ‘‘clandestinum K” 
[Kalm]in Linnezeus’s writing, which is taken as the type since it is the only specimen 
so marked by Linneeus, and since it agrees with his description. The Jamaica locality 
is evidently based upon the Sloane phrase name and figure cited as synonym. ‘This 
figure represents Hackelochloa granularis (L.) Kuntze, a species to which Linnzus’s 
description does not at all apply, for which reason the Jamaica locality is rejected. 
The Kalm specimen is the autumnal form, the secondary panicles inclosed in the 
sheaths, which are crowded at the summit. 
Milium clandestinum Moench, Meth. Pl. 204. 1794. Based on Panicum clandes- 
tinum L. 
Panicum latifolium clandestinum Pursh, Fl. Amer. Sept. 1: 68. 1814. Based on 
P. clandestinum ‘‘Willd. sp. pl. 1. p. 351.’’ In Willdenow’s Species Plantarum the 
original Linnzean diagnosis, citations, and description are given, with reference to 
“Sp. Pl. 86.’’¢4 
Panicam pedunculatum Torr. Fl. North. & Mid. U. 8. 141. 1823. ‘‘On the 
Island of New-York.’’ The type, in Columbia University Herbarium, is a vernal 
specimen 80 cm. high, beginning to branch, with an over-mature, long-exserted, 
primary panicle, the spikelets 2.8 mm. long. The accompanying label, in Torrey’s 
hand, reads ‘‘ Panicum PECTCULAe LT [followed by a brief diagnosis] ‘‘In wet 
meadows, among thickets. Aug.” 
Panicum clandestinum pedunculatum Tae. Fl. N. Y. 2: 426. 1843. Based on P. 
pedunculatum Torr. ; 
Panicum decoloratum Nash, Bull. Torrey Club 26: 570.1899. ‘‘Collected by Nie 
E. P. Bicknell on a sandy railroad bank at Tullytown, Pennsylvania, May 30, 1899.”” 
The type, in Nash’s herbarium, consists of four vernal specimens with partially 
included, immature panicles. The lower sheaths are papillose-hispid, less densely 
so than common in P. clandestinum, the upper glabrous. The immature spikelets 
are 2.7 mm. long. 
DESCRIPTION. 
Vernal form in large, dense clumps, sometimes with strong rootstocks, 5 to 10 cm. 
long; culms stout, 70 cm. to 1.5 meters high, erect, scabrous to papillose-hispid, at 
least below the nodes; sheaths as long as the internodes or overlapping until after the 
aSp. Pl. ed. 2. 86. 1762. 
