660 



POACE^ 



Arundo festucacM Willd. Enum. Hort. Berol. 1:126 (1809). 

 Donax featueaceus Bcauv. Agrost. 78 (1812). 



Culms 120-180 cm. high. Sheaths smooth to scabrous, thin, 

 mostly longer than the intcrnodes; ligule lacerate, 5-10 mm. long; 

 blades flat, scabrous, with long narrow points, 30- 

 45 cm. long, 5-10 mm. wide. Panicle 20-30 cm. 

 long, more or less cxserted, rays in half-wliorln of 

 2-4, distant 4-6 cm., the longest 8-12 cm. long, 

 bearing 4-12 spikelets on the outer half or three- 

 fifths. Lateral spikelets on pedicels about 2 mm. 

 long, linear-lanceolate or wider, 3-5-flowered, 8-0 

 mm. long; first empty glume linear-lanceolate, 5-7 

 mm. long, second oval-lanceolate, 7-8 mm. long» 

 Pio 112 — Socio- *P®^ lacerate ; floral glume oval, about 6 mm. 

 eliloa arundi- long, apex hyaline; palea linear-lanceolate before 

 ntieea. Spikelet. ,. •,• i ^ ii.ii/. i 



(RicliiinlHuu.) spreading, ciholate on the keels, 6 mm. long. 



Saskatchewan, Bourgeau in 1868; Northwestern Territory^ 

 Mavoun in 1880 ; British Columbia, Macoun in 1887 ; Iowa, li. J. 

 Crotty in 1883. 



130. (258). Obaphephobvm Desv. Nouv. Bull. Soc. Philonu 

 2:189 (1810). 



Spikelets 2-5-flowered, in a narrow or spreading panicle, racliilla 

 hairy, articulate below the florets, extending above them as a slen- 

 der stipe, flowers perfect. Empty glumes membranous, awnless, 

 slightly unequal, more or less keeled, as long as the floral glumes or 

 shorter, first 1-3-nerved, second 8-5-nerved ; floral glume round on 

 the back, 3-5-7-nerved, the lateral ones obscure, denticulate or torn 

 at the apex, awnless; palea narrow, 2-keeled, keels ciliolate. Stamens 

 3. Styl'js distinct. Grain oblong, flattened on the back, concavo 

 in front, often tipped with a soft appendage, enclosed by the glume 

 and palea, but not adhering to them. 



Erect grasses with flat leaf-blades. There are three or four 

 species known, peculiar to the cooler regions of America, Europe, 

 and Asia. The genus differs chiefly from Panicularia {Glycerin) in 

 having a hairy rachilla. If there were a twisted dorsal awn on tho 



