FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



Aristida tenuis (H.B. K.) Kunth. Rev. Gram. 1:62. 



Streptachne tenuis H. B. K. 

 Panicle exserted, 30-40 cm. 

 long, branches alternate-subfas- 

 ciculate, ascending; axis gla- 

 brous, rachis scabrous. Spike- 

 lets 30-36 mm. long on slender 

 scabrous pedicels. First and 

 second glumes purplish, lanceo- 

 late, acuminate, i -nerved; first 

 8.6 mm., minutely strigose, his- 

 pid on the nerve; second 1 1 mm., 

 glabrous; floral glume 12 mm. 

 (excluding awn), mottled dark 

 purple, awn 20-25 mm. long, 

 scabrous, lateral awns obsolete; 

 palea 1.4 mm., ovate, hyaline. 

 Grain light brown, linear-lance- 

 olate, acute, .6x9.5 mm - m 

 section ovoid-orbicular. 



Hab. Merida, Sept. 1865, 

 Schott 736; "Among low shrub- 

 bery and along old fences, near Izamal, 3 feet high, uncommon. 

 Aug." Gaunter 1024. 



Aristida scabra (H. B. K.) 

 Kunth. Rev. Gram, i :62. 



Streptachne scabra H.B. K. 



Panicle included at base or 

 finally exserted, 35-45 cm. long; 

 branches alternate, ascending; 

 axis and rachis very scabrous. 

 Spikelets 24-40 mm. long, on 

 slender, scabrous pedicels. 

 First and second glumes purplish, 

 lanceolate, acuminate, i -nerved; 

 first, 14 mm., scabrous, hispid on 

 the nerve, the second 13.5 mm., 

 glabrous; floral glume 10 mm. 

 (excluding awn), pale, awn 15-30 

 mm. long, scabrous, lateral awns 

 obsolete; palea minute, less than 

 i mm. long, hyaline. Grain light 

 brown, linear-lanceolate, acute, 

 .5x9.3 mm.; in section suborbic- 

 ular. 



Hab. "Two feet high, common,' 



Chichankanab, Gaumer 144.8. 



