34 



p. Rich, 1894. Rhode Isktnd: Johnston, J. W. Congdon, 1871. Connedkut: 

 Waterford, 87 C. B. Graves, 1898. Nev Jersey: Atsion, 44 A. Commons, 1882; 

 Gloucester County, 2 B. Heritage, 1897. Mississippi: Beauvoir, 4594 S. M. 

 Tracy, 1898. 

 The habit of Michaux's plant, as shown by figure 8, is so characteristic and so 

 closely resembles Panicum eatoni (Fig. 9) that we have no hesitation in referring 

 Panicum eatoni to Panicum nitidum. Panicum paucipilum can not l)e satisfactorily 

 distinguished from P. eatoni, either l)y the original descriptions or by compar- 

 ison of typical material. • The culms, sheaths, ligules, leaves, panicles, and 



spikelets are the same, and more- 

 over both forms grow in moist 

 places. Mr. Nash^ states that 

 Panicum paucipilum can be distin- 

 guished from P. eatoni by its much 

 smaller spikelets, with the first 

 glume glabrous and orbicular. 

 The difference in measurements of 

 the spikelets given by Mr. Nash is 

 but 0.2 nun., and according to his 

 original descrijition and to siiecL- 

 mensexamined the first glume of P. 

 eatoni is also glabrous ! The type of 

 Panicum spretum Schultes in ]Muh- 

 lenberg's Herbarium in the Acad- 

 emy of Nat. Sci. of Phil, is identical 

 with P. eatoni Nash., the form with 

 the dense contracted panicles. 



The figure of Panicum eatoni 

 above has shorter and broader 

 leaves than in the type. 

 PANICUM NITIDUM OCTINO- 

 DUM (Smith) n. comb. {Panicum 

 octinoduni Smith, U. S. Dept. Agr. 

 Div. Agros. Bui. 17: 73, f;/. 369 

 (Jime 30, 1899); Scribn. &" Smith, 

 ibid. Cir. 16: 5 (Julv 1, 1899).) 

 (Fig. 10.) 

 A form which differs from typical 

 Panicum nitidum only in having 

 smooth spikelets. 

 Type LOCALITY. — Waller County, Texas. 

 General distribution. — In ponds and 

 exsiccated swamps, Delaware and 

 Texas. 



Specimens examined. — Delnvnre: Townsend, W. N. Canby, 1891; Cape Henlopen, 

 340 A. Commons, 1898. Texas: Waller County, F. W. Thurow, 1898 (type). 



Fig. 10. — Panicum nitkhun ortuiodum (Smith): 

 spikelets; r, fldwcriiiggluine. 



a.h. 



PANICUM SCOPARITTM Lam. 



Panicum scoparium Lam. Encycl. 4: 744 (1797!); Michx. Fl. Bor. Am. 1:49 (1803!), 

 not of authors. {Panicum pubescens Lam. 1. c. 748!; Michx. 1. c. !, not of authors. 

 Panicum viscidum Ell. Sk. Bot. S. C. and Ga. 1:123 (1817!). (Fig. 11.) 



1 Bui. Torr. PMjt. Club, 26: 574 (1899). 



