FESTl'CE.E. 505 



Oreofon (Siskiyou Mountains), Howell in Jul}-, 1887. 



12. M. mutica Walt, Fl. Car. 78 (1788). M. glabra Miclix. Fl. 

 15or. Am. 1 : G3 (1803) in pai't. M. mutica var. glabra A. Gray, 

 Man. Ed. 3:555 (185G). 



Culms slender, 60-00 cm. high. Ligule brown below, 3 mm. 

 long; blades 6-7 in number, flat, smooth or seabrid, 10-15 cui. 

 long, 3-5 niiu. wide. Panicle racemose, 12-17 cm. long, rays single 

 or in couples, distant, few-flowered, tlie longest 4-5 cm. long. 

 Spikelets on slender curved pedicels, with 2 fertile flowers, longest 

 joint of rachilla 2 mm. long; first empty glume 6.5-9 mm. long, 

 broadly oval, 5-0-nerved, second 8-9 mm. long, nearly elliptical- 

 lanceolate, 5-7-nerved ; floral glume ellijDtical, 7-17-nerved, 9 

 mm. long; palea spatulate-elliptical, about mm. long. Professor 

 Scribner says: " Distinguished from M. diffusa, witli which it has 

 been united by some authors, by its more slender habit, less-branched 

 and fewer-flowered panicle, which is often reduced to a single 

 raceme. The spikelets also rarely have more than tv.-o perfect 

 florets, the outer glumes are more nearly equal in length, and often 

 quite as long as the spikelet, while the flowering glumes are broader 

 and more obtuse." 



Pennsyh-ania, Garher ; District of Columljia, McCarthij ; 

 Florida, Curtiss. 



Pennsylvania, Illinois, southward and westward to Texas. 



13. M. laxifloria Cavan. Ic. 5, 48. t. 473,/. 2 (1799). 



A tufted grass, 50-60 cm. high. Sheaths seabrid, longer than 

 the internodes; ligule white, thin, split, 5-7 mm. long; blades of 

 sterile shoots narrow, 2-10 mm. long, those of tlie culm 3-4 in 

 number, flat or involute, seabrid, 7-12 cm. long, 2-3 mm. wide. 

 Panicle open, 12-19 cm. long, rays at length spreading or droop- 

 ing, mostly in threes, the longest 5-8 cm. long, flower-bearing but 

 little below the middle. Spikelets on slender curved or reflexed 

 pedicels, 1-2-flowered, rachilla about 2 mm. long; empty glumes 

 white, thin, 5-nerved, first oval, 7 mm. long, second linear, 

 ■obtuse, apex sometimes notched, 6-7 mm. long; floral glume 6-7 

 mm. long, ovate-oblong, obtuse, seabrid, 11- to many-nerved; palea 

 linear-spatulate, 5 mm. long. 



