HITCHCOCK AND CHASE NORTH AMERICAN PANICUM. 



103 



DESCRIPTION. 



Plants like P. agrgstoides in habit, culms on the average rather taller, sometimes 

 geniculate at base; sheaths appressed-pubescent along the sides toward the summit 

 or glabrous; blades often sparsely pilose on the upper surface at the conduplicate 

 base; panicles terminal and axillary, 10 

 to 25 cm. long, rarely over 5 cm. wide, 

 the long, solitary or fascicled branches 

 erect, naked at the base, with ap- 

 pressed branchlets bearing crowded 

 spikelets on short, scabrous, but not 

 pilose pedicels, or these occasionally 

 with one or two erect hairs; spikelets 

 2.2 to 2.5 mm. long, about 0.8 mm. 

 wide, turgid; first glume slightly more 

 than half the length of the spikelet, 

 acuminate; second glume slightly 

 longer than the sterile lemma, both 



acuminate, the tips slightly spreading, scabrous on the midnerves toward the apex; 

 fruit 1.4 to 1.5 mm. long, about 0.7 mm. wide. 



This species is closely related to P. agrostoides, from which it is distinguished by 

 the condensed panicle of slightly larger spikelets. In occasional specimens, as Combs 

 964|, 973, Hitchcock 174, and Meislahn 159, the panicle branches are ascending, the 

 panicle not contracted, thus approaching P. agrostoides. 



Fig. 95. — Distribution of P. condensum. 



DISTRIBUTION. 



Borders of streams and ponds and in wet places, Pennsylvania to Florida and west 

 to Texas, mostly near the coast; also in the West Indies. 



New Jersey: Cape May County, Van Pelt in 1909 (Acad. Phil. Herb.). 



Pennsylvania: Chambers 1 © urg, Porter in 1897. 



Delaware: Smyrna, Long in 1908 (Acad. Phil. Herb.). 



District of Columbia: Steele in 1896. 



Virginia: Brick Haven, Steele in 1896; Four-Mile Run, Chase 2673; Virginia 

 Beach, Hitchcock 174. 



North Carolina: Wilmington, Hitchcock 444 . 



South Carolina: Isle of Palms, Chase 4527. 



Florida: Jacksonville, Curtiss 5298, 5576, 5576A; Titusville, Chase 4014; Orange 

 County, Baker 18, Combs 1144; Clarcona, Meislahn 159; Homosassa, Combs 

 957, 964|, 973; Crystal, Combs 1011; Jensen, Hitchcock 747; Miami, Hitchcock 

 172, 695, 699; Braidentown, Simpson 7093; St. Vincents Island, Chapman, 

 Tracy 6444. 



Mississippi: Horn Island, Tracy in 1893 (Hitchcock Herb.). 



Texas: Dallas County, R'everchon 2368; Waller County, Thurow in 1898; without 

 locality, Lindheimer 728. 



Bahamas: Nassau, Curtiss W. Ind. PI. 174. 



Cuba: Without locality, Wright 3862 in part. 



Grand Cayman: Hitchcock in 1891 (Mo. Bot. Gard. Herb.). 



Leeward Islands: Guadeloupe, Duss 3919. 



