44 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
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 J ersey. 
Frorwa: St. Augustine, Curtiss 6705, Kearney 176, Ricker 952; Sanibal Island, 
Simpson 292; Marco, Hitchcock Lee Co, Pl. 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. 
Banamas: Nassau, Curtiss 113. 
Cuba: Habana, Curtiss 748, Ledén 
291,570; Santiago de las Vegas, 
Baker & Wilson 512, Hitchcock 
147, 148, Tracy 9109; Triscor- 
nia, Hitchcock 159; Cabanas, Fi. 25.—Distribution of P. adspersum. 
Palmer & Riley 746,771; Her- 
radura, J'racy 9102; Sancti Spiritus, Leén 925; Guines, Leén 924; without 
locality, Wright 3869. 
Jamaica: Without locality, March (Gray Herb.). 
Porto Rico: Between Coamo and Aibonito, Sintenis 1957. 
DanisH West INptes: St. Croix, Eggers in 1876, Ricksecker 66, 384. 
LEEWARD IsLanps: Guadeloupe, Duss 3180. 
Panicum rAMosuM L, Mant. Pl. 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. 
Jasciculatum 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. 8. 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- 
FiG. 26.—P, arizonicum. From type specimen of P. 
dissitiflorum Vasey. 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 
panic le 15 cm. | long, the sheaths and under suriace of the blades papillose- hispid. 
au, sg. Dept. Agr. Div. Agrost. Cire. 32: 41 1901. 
