160 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



(Washington, D. C, May, 1897)." The Kearney specimen referred to could not be 

 found in Ashe's herbarium, but other specimens there under this name are P. xala- 

 pense, as are specimens in the National Herbarium bearing the name "Panicum 

 caricifolium' n in Scribner's writing. 



This is the species described as P. laxiflorum by American authors. 



Fig. 146. — P. xalapense. 

 type specimen. 



From 



DESCRIPTION. 



Vernal form similar to P. laxiflorum in texture and habit; culms and blades on the 

 average shorter, the blades pilose on one or both surfaces or nearly glabrous, usually 



short-ciliate, the uppermost more or less convolute 

 at base around the culm; panicles hardly so few- 

 flowered; spikelets 1.9 to 2 mm. long, 1.1 mm. wide, 

 oblong-obovate, obtuse, the first glume one-fourth to 

 one-third as long as the spikelet; second glume and 

 sterile lemma pilose, less prominently papillose, the 

 glume shorter than the fruit, the latter 1.5 mm. long 

 and 1 mm. wide, oval, minutely umbonate. 



Autumnal form as in P. laxiflorum, but forming 

 usually denser tufts with shorter leaves. 

 This species is conspicuously retrorsely pilose on the sheaths. Canby's no. 106, 

 Stone Mountain, Ga., in the Gray Herbarium, is exceptional in having almost glabrous 

 sheaths. 



DISTRIBUTION. 



Woods, Maryland, Illinois, and Missouri to Florida, Texas, and Mexico; also in 

 Santo Domingo. 



Indiana: Clarke County, Deam 6883. 



Illinois: Jackson County, French in 1905. 



Missouri: Campbell, Bush 749 in part; Swan, Bush 4638; Jefferson County, 



Eggert 127; Pacific, Kellogg 19. 

 Maryland: Cabin John, Chase 5412, Chase in Kneucker Gram Exs. 549; west 



District Line, Hitchcock 343; Great Falls, Chase 2316, 2320. 

 Virginia: Richmond, DeChalmot; 



Smyth County, Small in 1892; 



Princess Anne County, Kear- 

 ney 1033, 1104, 1179, 1308, 



1467, Pollard & Maxon in 



1900. 

 North Carolina: Biltmore, Bilt- 



more Herb. 2993a; Madison 



County, Biltmore Herb. 2993c; 



Raleigh, Ashe; Chapel Hill, 



Ashe, Chase 3057; Wilmington, 



Chase 3111, 3117, 3118. 

 South Carolina: Orangeburg, 



Hitchcock 1391, 1415, 1424; Clemson College, House 2177. 

 Georgia: Thomson, Bartlett 1453; Rome, Curtiss 6791; Warm Springs, Tracy 



8867; Augusta, Cuthbert 1119, Kearney 212; Union, Harper 1085; Clarke 



County, Harper 77; Dublin, Harper 2140; Stone Mountain, Chase 4517, 



Eggert 86, Harper 183, Hitchcock 1361, Small in 1893, Wilson 14. 

 Florida: Jacksonville, Curtiss 6602; Lake City, Combs & Rolfs 141; Tallahassee, 



Combs 390, Kearney 75; Sanford, Hitchcock 773; Titusville, Chase 4009; Dade 



County, Curtiss 5537, Eaton 589, 831, Hitchcock 659, 673, Tracy 8849; Manatee 



County, Tracy 6694; Sarasota Key, Tracy 7202; Alva, Hitchcock Lee Co. 



Fig. 147.— Distribution of P. xalapense. 



