1906] Hitchcock, — Notes on Grasses 207 



rowed toward the base, loiig-pilose on both surfaces, tlie hairs of the 

 upper surface 4-5 mm. lonfi^, erect from the plane of the bhide;' ligule 

 3-4 mm. long; primary ])anides at first usually overtojijjcd'bv the 

 upper leaf, but at or past maturity exserted, ovate or rhombic in out- 

 line, 4-G cm. long, nearly as wide, loosely flowered, the axis pilose, 

 branches flexuous, sjjreading or ascending; the secondary panicles 

 smaller, numerous, overtoi)j>ed by the leaves; spikelets IX 1.8-1.9 

 mm., obovate and turgid at maturity, obtuse, pilose with weak spread- 

 mg hairs, first glume J-^ the length of the spikelet, triangular, 1-nerved; 

 second and third subequal, 7-ncrved, the second slightlv shorter than 

 the fruit at maturity; fruit IXI.O mm., broad-elliptic. ' Winter leaves 

 lanceolate, long pilose. 



This species scarcely has a simple state, the branches appearing 

 often before the first jianicle is expanded. Distinguished from P. 

 lannginosum by the early branching, the usually shorter culms, the 

 firmer, narrow, long-pilose blades, the smaller, fewer-flowered panicles, 

 and more turgid, longer-pilose spikelets. 



Dry prairies and clearings, Michigan to Oklahoma and Texas. 



Type V. H. Chase 64O; dry bank, near ^\ady Petra, Stark County, 

 Illinois, June 30, 1900, collected by Virginius H. Chase. 



Distribution: Michigan: Michigan Agricultural College, Wheeler 

 18 in 1900. Wisconsin: Lauderdale, R. Behh 1000. Illinois: 

 Joliet, Skeels 252; Wady Petra, V. H. Chase, 1^72 and 61^9. Mis- 

 souri: Howell County, Bush o4; Monteer, Bttsh 743 and 748. 

 Kansas: ISIanhattan, KeUcrman 20; Carleton in 1892. Oklahoma 

 Territory: Stillwater, Hitchcock in 1903. Texas: W^aller County, 

 Thumw 5 in 189S. 

 Panicum lanuginosum var. siccanum Hitchc. & Chase, var. nov. 



Plants smaller than typical P. lanuginosum, of similar habit, the 

 culms appressed-pilose, the sheaths less stiffly jmIosc than in the spe- 

 cies, blades usually somewliat firmer, the upper surface glabrous or 

 with a few scattered long hairs, mostly near the base, lower surface 

 pubescent; ligule shorter (1 mm. long); panicle more o])en, fewer- 

 flowered, usually smaller; spikelets 1X1.7 mm., more rounded and 

 turgid than those of the species, the pubescence shorter. Much like 

 smoother forms of the species and distinguished only by the characters 

 given. 



Dry sand, ]\Iassachusetts to North Carolina, west to Kansas. 



Type Chase 1602, Dry, hot sand of sandstone cliff, Starved Rock 

 111. 



Distribution: JMASSACTirsETTS: West Quincy, Churchill in 1891; 

 ^Ne\\fish•y, Smith 735. Connecticut: Moniv'iWc, Graves 328; Lyme, 



