—43— 



rough plants in a colony of normal ones, but forms combining all 

 of Engelmann's points are rare. Type, Newburn, N. C, and 

 Kentucky. 



2. Blatum Eng. Very tall, 3-4 feet high. Sheaths with 

 about 30 leaflets, the points linear-lanceoiate, membranous, ir- 

 regularly deciduous, leaving a torn, blunt, black base. Newburn. 

 X. C, Kentucky. 



3. Ramosum forma nov. Stout. 3 to 4 lines thick, i l / 2 to 3 

 feet tall, oftenest very smooth; internodes 4 to 5 inches long, 

 sheaths tighter, funnel form above in sterile plants, with 25 to 

 30 narrow linear leaves, those of the lower sheaths keeled below, 

 concave above, those of the upper rounded on the back ; teeth 

 deciduous or persistent and finally hyaline ; the black base often 

 fading and the sheaths taking on a flesh tint. Branches appearing 

 with the spikes in whorls of 2 to 6, becoming 7 to 10 inches long, 

 about a line wide, 7 to 9 angled, carinal holes small or obsolete, 

 the vallecular small ; sheaths with persistent teeth or with the 

 upper, subulate half deciduous, the remaining part horny, black, 

 centrally grooved, the groove decurrent into the leaf. Type. 

 Callaway, Neb., Rev. J. M. Bates; Oak Creek. North Arizona. 

 Dr. McDougal, 482 (Nat. Herb., 25,979) ; Unionville, Nev., Wat- 

 son, 1.355, King Expedition, sheaths with black girdle at base. 

 Albuquerque, N. Mex., Tracy and Evans; Wessels' Ranch, near 

 Lewiston, Idaho. Henderson. Some of Bates' and McDougal's 

 plants have no vallecular holes in the upper part of the stem. 



4. Caespitosum forma nov. Stems several to many, mostly 

 small and rough, at times clustered around a larger central one ; 

 teeth persistent, fading, flexuous : fruiting in July. Apparently 

 formed by a second growth springing up after the early stems 

 have fruited. Callaway, Neb.. Rev. J. M. Bates. 



5. Variegatoides forma nov. Low, cespitose. prostrate or 

 ascending, 3 to 10 inches long, l / 2 to i]/ 2 lines in diameter, 

 prominently 6 to 12 angled, very rough with prominent, sharp 

 cross-walls of silex, both on the ridges and in the grooves. 

 Sheaths elongated, little widened, usually contracted at the 

 mouth ; leaves rounded on the back, with or without a shallow 

 central groove in the upper part, eventually becoming white in 

 whole or in part ; teeth persistent or only the subulate upper half 



