MACLOSKIE: GRAMINE^E. 161 



i. A. CONSANGUINEUS Knth. 



Culms slender, about 25 cm. high, branching. Leaves to 10 cm. long 

 by 1.5-2 mm., rough margined. Spathes 4 cm. long. Racemes lax, sub- 

 simple, 6-8-jointed, bearded at the base, with trilobulate appendage. 

 Spikelets sessile, rufescent. Glumes i and 2 with scabrid keels, glume 3 

 shorter, nerveless, split to near the base, as is the floriglume, no. 4, which 

 has an awn 1 7 mm. long basally torted ; glume i linear-subulate, with a 

 bearded callus ; glume 2 linear-lanceolate. Palea none. Stamens 2-3, one 

 of them larger. Pedicels suberect, ciliate, 6-9 mm. long, equalling the joints. 



(S. Brazil) ; N. Patagon., in rocky plains near Rio Colorado. 



2. A. SACCHAROIDES Sw. 



Culm erect, simple, terete (30-40 cm. high), nodes silky-bearded. Leaves 

 linear, subvillous. Panicle compact, linear-oblong, its rays solitary or in 

 pairs, simple or bifid, floriferous from base. Joint and pedicel of fading 

 spikelet densely villous. Awn twice as long as its villous spikelet. 



N. Patagon. (Roca Exped.) ; Brazil; W. Indies. 



3. IMPERATA Cyr. 



Perennial grasses of medium height with innovations of long leaves, 

 short culms, and spike-like \voo\\y panicle, creeping rhizome with scaly sto- 

 lons. Spikelets in twos at the nodes, the primary long-, the secondary short- 

 pediceled, all i -flowered, hermaphrodite, linear, subcompressed, awnless. 

 Glumes 4, of which i and 2 are membranaceous, convex ; 3 is hyaline, 

 empty ; 4 is hyaline, rarely wanting : palea always present, broad, hyaline, 

 nerveless, enclosing the grain. Lodicules none. Stamens 1-2. 



Species 3-4, in tropics of both worlds. 



I. ARUNDINACEA Cyr. 



Culms about i meter high, of 3-4 nodes, glabrous, shortly naked above. 

 SheatJis mostly longer than the internodes, at length becoming dry par- 

 allel fibers. Spike-like panicle 5-20 cm. long, racemes 1-2 cm., of 5-10 

 internodes. Spikelets 4-5 mm. ; the villi from the callus 4-5 times as long, 



I. ARUNDINACEA CONDENSATA (Steud.). 



Nodes of sheath glabrous; ligule 2-3 mm., ovate, obtuse; laminae of 

 leaves sublanceolate-linear, attenuate to a long, slender point, not pun- 

 gent, the lower 10-15 cm - l n g. smooth on both surfaces. 



(Chili); Patagon., dry meadows near Colonia; Bolson. 



