3l2 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; spikelets2.7 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 



of the branches 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 velvety beneath 191a. P. boscii molle, 



189. Panicum clandestinum L. 



Panicum clandestinum L. Sp. PL 58. 1753. "Habitat in Jamaica, Pensylvania. 

 Kalm" In the Linnsean Herbarium is a specimen marked ''clandestinum K" 

 [Kalm] in Linnaeus' s writings which is taken as the type since it is the only specimen 

 so marked by Linnaeus, 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 granulans (L.) Kuntze, a species to which Linnaeus'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. pi. 1. p. 351." In Willdenow's Species Plantarum the 

 original Linnaean diagnosis, citations, and description are given, with reference to 

 "Sp. PL 86." a 



Panicum pedunculatum Torr. Fl. North. & Mid. U. S. 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 pedunculatum*" [followed by a brief diagnosis] "In wet 

 meadows, among thickets. Aug." 



Panicum clandestinum pedunculatum Torr. Fl. N. Y. 2: 426. 1843. Based on P. 

 pedunculatum Torr. 



Panicum decoloratum Nash, Bull. Torrey Club 26: 570. 1899. "Collected by Mr. 

 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. 



