252 NORTH AMERICAN FLORA [Volume 17 



117. Panicum annulum Ashe, Jour. Elisha Mitchell Soc. 15: 58. 



1898. 



Panicum Bogueanum Ashe, Jour. Elisha Mitchell Soc. 16: 85. 1900. 



Vernal phase usually purplish, in small clumps or solitary; culms 35-60 cm. high, the 

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

 upper nearly glabrous; blades 6-12 cm. long, 7-13 mm. wide, densely velvety-pubescent on 

 both surfaces, the margin ciliate toward the base; panicles 6-8 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 slightly shorter ; fruit 

 1.8-1.9 mm. long, 0.9 mm. wide, elliptic. 



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

 nodes; soon dying to the ground. 



Typ3 locality: Washington, District of Columbia. 



Distribution: New Jersey to Missouri and Alabama. 



Illustrations: Contr. U. S. Nat. Herb. 15: /. 183; Britt. & Brown, 111. Fl. ed. 2. /. 349. 



118. Panicum mattamuskeetense Ashe, Jour. Elisha Mitchell Soc. 



15: 45. 1898. 



Panicum fiexuosum Muhl.; Scribn. & Merr, Circ. U. S. Dep. Agr. Agrost. 27: 3, as synonym. 1900. 

 Not P. fiexuosum Retz. 1791. 



Vernal phase in clumps of few to several culms, olivaceous, usually strongly tinged with 

 deep purple; culms stout, erect or subgeniculate at base, the nodes bearded or the upper puberu- 

 lent only ; leaf -sheaths less than half the length of the internodes, pilose on the margin, a puberu- 

 lent ring at the summit, the auricles pilose, the lower sheaths velvety-pilose, the upper glabrous 

 or velvety; ligule dense, 0.7 mm. long; blades horizontally spreading, 8-12 cm. long, 8-12 mm. 

 wide (basal blades much shorter), acuminate, narrowed toward the base, the lower velvety, 

 the upper glabrous, on both surfaces; panicles long-exserted at maturity, 8-10 mm., rarely 

 12 mm. long, about three fourths as wide, many-flowered, the flexuous branches spreading, 

 with short spikelet-bearing branchlets in the axils; spikelets 2.3-2.5 mm. long (rarely 2.7 mm. 

 long), 1.1 mm. wide, elliptic, pointed before maturity, pubescent; first glume about one third 

 the length of the spikelet, subacute; second glume and sterile lemma subequal, barely covering 

 the fruit at maturity; fruit 2 mm. long, 1 mm. wide, elliptic. 



Autumnal phase erect or becoming somewhat decumbent, branching rather sparingly 

 from the middle nodes after the maturity of the primary panicles, the branches rather appressed,. 

 the reduced crowded blades ascending. 



Type locality: Lake Mattamuskeet, North Carolina. 



Distribution: New York to North Carolina. 



Illustrations: Contr. U. S. Nat. Herb. 15: /. 185; Britt. & Brown, 111. Fl. ed. 2. /. 351. 



119. Panicum Clutei Nash, Bull. Torrey Club 26: 569. 1899. 



Vernal phase similar in color, size, and habit to that of P. mattamuskeetense, but more nearly 

 glabrous, only the lowermost nodes, leaf-sheaths, and blades velvety, the puberulent ring at 

 the summit of the sheath less dense or wanting ; panicles similar, on the average smaller ; spike- 

 lets 2.2-2.3 mm. long, 1 mm. wide, indistinguishable from the smaller spikelets of P. mattamus* 

 keetense; fruit the same size and shape. 



Autumnal phase stiffly erect, branching from the lower and middle nodes before the matu- 

 rity of the primary panicles, the earlier branches nearly equaling the primary culms, the later 

 branches shorter, somewhat crowded, the reduced blades spreading. 



Type locality: Southern New Jersey. 

 Distribution: Massachusetts to North Carolina. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 187. 



120. Panicum boreale Nash, Bull. Torrey Club 22: 421. 1895. 



Vernal phase cespitose ; culms erect, or in shaded places sometimes decumbent at base, 

 usually 30-50 cm. high, the nodes glabrous or sometimes with a few hairs; leaf -sheaths often 



