NEW PLANTS FROM MISSOURI.* 



K. K. Mackenzie and B. F. Bush. 



A more intimate acquaintance with the plants of Missouri 

 has convinced the writers that there are quite a number of 

 species that have never been described or have been mistak- 

 enly referred to species already described. A number of 

 these have been under consideration for several years, but 

 owing to lack of proper material for study, or for compari- 

 son, the results of our investigations have been held back 

 until the present time. We now present the first paper upon 

 the subject, hoping in a short time to be able to present 

 the complete results of our observations. In the study of the 

 following new species we have been very much assisted by 

 Prof Wm. Trelease, who very kindly loaned us specimens 

 for study of related species in the Herbarium of the Mis- 

 souri Botanical Garden, and to whom we hereby acknowledge 

 our indebtedness. 



MUHLENBERGIA P0LY8TACHTA n. Sp. 



An erect or ascending much branched glabrous perennial, 

 6-9 dm. high, with long scaly rootstocks ; nodes enlarged ; 

 sheaths equaling or somewhat exceeding the internodes; 

 leaves 5-17.5 cm. long, 3-5 mm. wide at base, gradually atten- 

 uate, rough on both sides, especially so above, flat, or in dry- 

 ing slightly revolute; panicles 5-10 cm. long, long cxserted,. 

 the branches all appressed and ascending, two to three to- 

 gether, the lower branches separated, the upper contiguous 

 and usually much overlapping, the branches each bearing 

 from three to about twenty-five sessile spikelets ; spikelets 

 2 mm. or less long, the two outer glumes short cuspidate,, 

 about equal and from very slightly shorter to very slightly 



♦ Presented by title before The Academy of Science of St. Louis, Janu- 

 ary 6, 1902. 



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