HITCHCOCK AND CHASE NOETH AMERICAN PANICUM. 



101 



appressed, scabrous, the latter usually bearing at the summit one to several delicate 

 white hairs, these often one-fourth to one-third as long as the spikelet; spikelets 1.8 

 to 2 mm. long, in occasional specimens 2.2 mm. long, 0.7 to 0.8 mm. wide; first 

 glume hardly half the length of the spikelet; second glume and sterile lemma sub- 

 equal, 5-nerved, the midnerves scabrous at the summit; fruit 1.3 mm. long, 0.6 mm. 

 wide. 



This widely distributed species is variable in the form of the panicle, occasional 

 specimens approaching P. condensum, and others P. stipitatum. The Muhlenberg 

 specimens in the Willdenow and Muhlenberg herbaria are the characteristic form 

 described above. 



The following specimens have rather turgid spikelets 2 to 2.2 mm. long, more or less 

 crowded on the ascending but not appressed branches and appear to be intermediate 

 between P. agrostoides and P. condensum. These are not cited in the distribution 

 given below. Maine: North Berwick, Parlin 751; Massachusetts: Newburyport, 

 Conant; New York: Erastina, Pollard in 1894; Virginia: Boettcher 462; Georgia: 

 Leslie, Harper 1730; Florida: Jacksonville, Curliss 5302; Bartow, Combs 1207; 

 Louisiana: Lake Charles, Chase 4410; Texas: Dallas, Reverchon 1083A; Hempstead, 

 Hall 819; without locality, Reverchon 103 in 1879. 



In the following specimens the spikelets are more or less secund on the branchlets, 

 giving the panicles much the aspect of those of P. stipitatum, but the spikelets are 2 

 mm. long or scarcely more: Bartlett 1066, Chase 4397, Curtiss 6890, Harper 1239, Plank 

 24, Riggs, Marshall, Texas. 



Unusually loosely flowered, open-panicled specimens, such as that named P. elon- 

 gatum var. ramosius, are the following: Chapman, Georgia, Curtiss 6888, Mohrin 1885, 

 Plank 75, Winchell, Alabama. 



' distribution. 



Wet meadows and shores, Maine to Illinois and Kansas, south to Florida and Texas; 

 also on Vancouver Island and in California. 



Maine: Orono, Harvey 1240; North Berwick, Parlin in 1896 (Gray Herb.). 



Massachusetts: Without local- 

 ity, Conant; Middlesex Fells, 

 Knoivlton 910 (Hitchcock 

 Herb.). 



Connecticut: South Manchester, 

 Hitchcock 129; Huntington, 

 Fames in 1895; Southington, 

 Bissell 5529. 



Rhode Island: Cumberland, 

 Greenman 1804 (Gray Herb.). 



New York: Cleveland, Roiolee in 

 1906. 



New Jersey: Mount Arlington, 



Mackenzie 2355; Stockholm, Van Sickle in 1895; Atsion, Chase 3529; Mon- 

 mouth Junction, Pearce in 1884. 



Pennsylvania: Chambersburg, Porter in 1897; Tinicum, Smith 158; Westches- 

 ter, Darlington; without locality, McMinn. 



Ohio: Sandusky, Kellerman in 1902 (Univ. Ohio Herb.). 



Indiana: Miller, Umbach in 1896 (Field Mus. Herb.). 



Illinois: Madison, Eggert 227; St. Clair County, Brendel in 1850; southern Illi- 

 nois, Vasey in 1860. 



Missouri: Lake City, il/ac^enzie 301; Sibley, -Bits/i 302; Monteer, £Ms/i 5115 in part; 

 Lees Summit, Bush 5234; Dunklin County, Bush 9. 



Fig. 93. — Distribution of P. agrostoides. 



