44 



CONTRIBUTIONS FBOM THE NATIONAL HERBARIUM. 



Fig. 25. — Distribution of P. adspersum. 

 Leon 925; Guines, Leon 924; without 



DISTRIBUTION. 



Moist open ground, Florida and the West Indies, often a weed in pastures and culti- 

 vated fields. It has been collected as a ballast plant by Mohr at Mobile, Alabama, by 

 Scribner at Philadelphia, Pennsylvania, and by Martindale at Camden, New Jersey. 

 Florida: St. Augustine, Curtiss 6705, Kearney 176, Bicker 952; Sanibal Island, 

 Simpson 292; Marco, Hitchcock Lee Co. PI. 485; Miami, Chase 3851, Hitchcock 

 650; Sand Key, Curtiss 3606**; 

 Key West, Curtiss 5431, Hitch- 

 cock 611, 618, 620; without lo- 

 cality Chapman. 

 Alabama : Mobile, on ballast, Mohr 



in 1891. 

 Bahamas: Nassau, Curtiss 113. 

 Cuba: Habana, Curtiss 748, Leon 

 291, 570; Santiago de las Vegas, 

 Baker & Wilson 512, Hitchcock 

 147, 148, Tracy 9109; Triscor- 

 nia, Hitchcock 159; Cabanas, 

 Balmer & Biley 746, 771; Her- 

 radura, Tracy 9102; Sancti Spiritus 

 locality, Wright 3869. 

 Jamaica: Without locality, March (Gray Herb.). 

 Porto Rico: Between Coamo and Aibonito, Sintenis 1957. 

 Danish West Indies: St. Croix, Eggers in 1876, Bicksecker 66, 384. 

 Leeward Islands: Guadeloupe, Duss 3180. 

 Panicum ramosum L. Mant. PI. 1: 29. 1767, an Asiatic species of this group and 

 somewhat resembling P. adspersum, but with smaller spikelets, having a finely trans- 

 versely rugose sterile lemma, in appearance much like the fertile lemma, was collected 

 on ballast, at Mobile, Ala., Sept. 16, 1891, by Dr. Charles Mohr. This is the specimen 

 referred by Scribner « to P. chartaginense. 



14. Panicum arizonicum Scribn. & Merr. 



Panicum dissitiflorum Vasey in S. Wats. Proc. Amer. Acad. 24: 80. 1889. This 

 is listed without description, Palmer's numbers 159 and 190, Guaymas, Mexico, 

 being cited. Two species were distributed under Palmer 159, P. arizonicum and P. 



fasciculatum chartaginense, a speci- 

 men of each of which is on the sheet 

 of no. 159 which was in the National 

 Herbarium in the time of Doctor 

 Vasey. The plant of P. arizonicum 

 is taken as the type, since other 

 specimens of this species are named 

 P. dissitiflorum in Vasey 's writing. 



Panicum fuscum major[us] Vasey, 

 U. S. Dept. Agr. Div. Bot. Bull. 

 8: 26. 1889. "Mexico (Dr. E. 

 Palmer)." The type, in the Na- 

 tional Herbarium, is from south- 

 western Chihuahua, collected Au- 

 gust to November, 1885, no. 1 b. 

 It is a robust specimen, 60 cm. 

 high, lacking the base, the blades as much as 15 cm. long and 15 mm. wide, the large 

 panicle 15 cm. long, the sheaths and under surface of the blades papillose-hispid. 



Fig. 26. — P. arizonicum. From type specimen of P. 

 dissitiflorum Vasey. 



«U. S. Dept. Agr. Div. Agrost. Circ. 32 : 4. 1901. 



