MACLOSKIE : GRAMINE^E. I 93 



palea and a flower ; the rudimentary second flower being usually a pro- 

 longed, tufted rachilla. Grain free ; seed adherent to the pericarp. 



Species 130, in temperate and cold parts of the E. and W. Hemispheres ; 

 and many in the Andes. The new-world species belong to the section 

 Deyeuxia, having hairy prolongation of the rachilla, and the callus hairs 



short or obsolete. 



KEY TO THE SPECIES. 



A. Panicle lax. Floriglumes awned. 



b. Scabrid. Glumes subequal, nearly twice as long as the flower. 



c. Low, cespitose, i o cm. Panicle purplish. Spikelets long, 30 mm. erythrostachya. 



c2. Tall, 70 cm., from a creeping root. Panicle subsecund, partly nutant. 



montevidensis. 

 b2. Smooth. 



c. Awrrs and glumes 4 mm. Spikelets 6 mm. Cespitose, culms 8 cm. Panicle narrow, 



lax, secund. suka. 



c2. Awns short. 



d. Glumes 4 mm., violet. Floriglume 2 mm. Culm 60 cm., naked above. Rays 



in 3*s and $'s. laxiflora. 



d2. Glumes 6 mm. Panicle large, rays in 2's and 3*8. hirthi. 



d$. Glumes subequal, as long as the flower and the awn. Culm 50 cm., from a 

 creeping base. Leaves rough-edged, at first flat. Panicle narrow, spreading. 



neglecta. 

 A2. Panicle contracted, mostly spike-like. All glabrous. 



b. Awnless. Small, 12 cm., from a creeping root, with small flat leaves. Panicle few- 

 flowered. Spikelets 3 mm., with rudiment of a second flower. freticola. 

 b2. Awned. 



c. Leaves plane. 



d. Culm 20 cm., rough upwards. Rays short. Spikelets 3 mm. No second rudi- 

 ment, fuegiana. 

 d2. Culm robust, 65 cm. Glumes 5 mm. Floriglume truncate. Awn short. 



magellanica. 

 d$. Culm glabrous, sheathed above second node. Floriglume with long basal 



villosity, and awn its own length. patagonica. 



c2. Leaves convolute. Culm 45 cm. Rays short, few-flowered. Spikelets only 2 mm., 



bluish. Awn short. poceoides. 



c$. Leaves complicate, subpungent. Culm erect, 3-4 nodes sheathed. Spikelets small, 

 I -flowered. Floriglume with short basal hairs, and short awn. ameghinoi. 



i. CALAMAGROSTIS (DEYEUXIA) AMEGHINOI (Speg.). 



Ch&topJiom ; not or scarcely subcespitose, glabrous, stoutish ; culm erect, 

 straight, 3-4 nodes below the middle sheathed more than half way. Leaves 

 more or less complicate, pallidly green, glaucescent, rather rigid, sub- 

 pungent, not scabrid. Ligule very short, truncate. Panicle contracted, 



