186 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



DESCRIPTION. 



Vernal form usually purplish, in small clumps or solitary; culms 35 to 60 cm. high, 

 the nodes densely bearded; sheaths shorter than the internodes, velvety-pubescent 



or the upper nearly glabrous; blades 6 to 12 cm. 

 long, 7 to 13 mm. wide, densely velvety-pubescent 

 on both surfaces, the margin ciliate toward the base; 

 panicles 6 to 8 cm. long, about three-fourths as wide, 

 rather numerously flowered, the flexuous branches 

 ascending or later spreading; spikelets 2 mm. long, 

 0.9 mm. wide, elliptic, blunt; first glume one-fourth 

 to one-third the length of the spikelet, obtuse; 

 second glume and sterile lemma pubescent, the 

 glume slighty shorter; fruit 1.8 to 1.9 mm. long, 0.9 

 mm. wide, elliptic. 



Autumnal form erect, bearing in late summer a few short, erect branches at the 

 upper nodes; soon dying to the ground. 



Fig. 183.— P. annulum. From 

 type specimen. 



DISTRIBUTION. 



Dry woods, New Jersey to Georgia, and west to Mississippi; also in Missouri; rare. 

 New Jersey: Milburn, Mackenzie 2138. 

 Pennsylvania: Chester County, Pennell 999, Windle 7; Delaware County, Pen- 



nell 621, 642, 727, 1184. 

 Missouri: Hunter, Eggert in 1893 



(Mo. Bot. Gard. Herb.). 

 Maryland: West Chevy Chase, 



Chase 2947, 3809, 5420. 

 District of Columbia: Woodley 



Park, Ward in 1^2. 

 Virginia: Great Falls, Chase 



3708. 

 North Carolina: Chapel Hill, 



Ashe hi 1%$%. 

 Georgia: Augusta, Cuthberi 431. 

 Alabama: Mobile, Mohr in 1897; 



Auburn, Earle & Baker 1544 (Ala. Polyt. Inst. Herb.) 

 Mississippi: Starkville, Tracy in 1888. 



Fig. 184.— Distribution of P. annulum. 



106. Panicum mattamuskeetense Ashe. 



Panicum mattamuske[e]tense Ashe, Journ. Elisha Mitchell Soc. 15 : 45. 1898. 

 "Roadsides, ditch banks, and wet open woods around Lake Mattamuskeet, N. C. 

 * * * Collected by the writer, and Mr. Gilbert Pearson in June, 1898." The type 

 could not be found in Ashe's herbarium. In the National Herbarium is a specimen 

 labeled "Panicum Mattamusketense Ashe, Lake Mattamuskeet" in Ashe's hand- 

 writing, collected "June 10-July 6, 1898," by "W. W. Ashe," evidently a duplicate 

 type. This is a single vernal culm nearly 80 cm. high, with a mature panicle, and 

 agrees in all respects with the description except that the spikelets are described as 

 glabrous, while those of the specimen are pubescent. The two lower sheaths and 

 lowest blade are velvety pilose; the spikelets are 2.3 mm. long. A second duplicate 

 type in Biltmore Herbarium is a better and more characteristic specimen. 



Panicum flexuosum Muhl.; Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Circ. 

 27: 3. 1900, not Retz. 1791. This herbarium name of Muhlenberg is listed and 



