182 



CONTRIBUTIONS FROM THE NATIONAl/ HERBARIUM, 



Fig. 178.— p. microcarpon. 

 From type specimen in 

 Elliott Herbarium. 



glabrous, or rarely minutely pubescent; first glum^ one-fourth the length of the 

 spikelet or less; second glume a little shorter thsm the sterile lemma and slightly 

 exposing the fruit at maturity; fruit 1.3 to lA/mm. long, 0.7 mm. wide, elliptic, 

 slightly pointed. 



Autumnal form much branched from all the nodes, reclining from the weight of 

 the dense mass of branches; blades reduced, flat, mostly 2 to 

 4 cm. long; thecilisrof the sheaths and the hairs at the base 

 of the blades relatively more conspicuous; panicles much 

 reduced and loosely flowered; the tufted basal blades often 

 large, sometimes as much as 8 cm. long and 15 mm. wide. 



The following specimens have pubescent spikelets, but 

 differ in no other respect from the typical form: Massa- 

 chusetts: Bartlett 844; Connecticut: Bissell 5570; New 

 Jersey: Heritage 4; Pennsylvania: Smith 102; Illinois: 

 Schnech in 1880; Delaware: Canby 15; District of Colum- 

 bia: Pollard 408, Vasey in 1884; North Carolina: Biltmore Herb. 803a, Chase 3204; 

 Georgia: Ruth 57; Florida: Curtiss, P. Q.; Alabama: Carver 40, Hitchcock 1343; 

 Mississippi: Tracy 1733, 3388,a 3623; Arkansas: Heller 4237. The last specimen is 

 also exceptional in being pubescent throughout. 



Curtiss's no. 6648, McClenny, Florida, with glabrous spikelets as much as 1.8 mm. 

 long, seems to be intermediate between P. microcarpon and P. nitidum. 



distribution. 



Wet woods and swampy places, Massachusetts to Illinois, and south to northern 

 Florida and eastern Texas. 



Massachusetts: Milton, Bartlett 844. 



Connecticut: New Haven, Bissell 5566; Groton, Bissell 5569; Stratford, Bissell 



5571; Milford, Bissell 5570. 

 Rhode Island: Providence, Collins in 1891 (Gray Herb.). 

 New York: Eastern New York, Austin (Mo. Bot. Gard. Herb.). 

 New Jersey: South Amboy, Mackenzie 1484, 2161; Morris Plains, Mackenzie 1605; 



Ha worth, Mackenzie 2476; 



Wildwood, Chase 3516, Heri- 

 tage 4, 4^; Clifton, Nash in 



1892. 

 Pennsylvania: Lancaster County, 



Heller 4770 in part, 4787, Small 



in 1889; Philadelphia, Smith 



102. 

 Ohio: Albion, Ashcroft in 1897; 



Jackson, Kellerman 6778. 

 Indiana: Brazil, Somes 232. 

 Illinois: Peoria, Brendel; Mount 



Carmel, Schnech in 1880. 

 Missouri: Butler County, Eggert 236; Campbell, Bush 747 in part; Dunklin 



County, Eggert 287. 

 Delaware: Milton, Commons 346, 347; Centerville, Commons 285; Townsend, 



Canby 15. 

 Maryland: Chesapeake Beach, Chase 3253, 3262; Hitchcock 1606, 1611; Belts- 



ville. Chase 3767, 3831; Riverdale, Chase 2367, 2370. 

 District of Columbia: Ball 704, Chase 5419, in Kneucker Gram. Exs. 550, 



Hitchcock 370, 596, Merrill 197, Pollard 362, 406, 408, Vasey in 1884. 



a Tracy's no. 3388 was erroneously cited under Panicum subbarbulatum Scribn. & 

 Merr. U. S. Dept. Agr. Div. Agrost. Circ. 29: 9. 1901. 



Fig. 179.— Distribution of P. microcarpon. 



