48 PANICACE.E. 



covered by the slieath-like bracts, the pedicels and rachis bearing- 

 a few short spreading liairs. Sessile spikelet linear-lanceolate, about 

 6 mm. long; first glume firm, scabrous, flattened, obscurely nerved; 

 second a little shorter, incurved, compressed-keeled, 3-nerved ; the 

 fourth with a thin pointed projection 2 mm. long each side of the 

 twisted awn, which is about 1.5 cm. long. Pedicels 3.5 mm. long 

 bearing a rudimentary spikelet with an awn nearly twice its length. 



Florida, Chapman, for F. L. Scribner, teste E. Hackel; also 

 A. P. Garher in 1887, Gardier in 1892. 



Var. pruinatus Hack. D. C. Monog. Phan. 370 (1889). Nodes 

 and blades pruinose. Florida, Simpson. 



9. A. Schottii Rupr. Hack, in Mart. Fl. Bras. 2; Pars. 3 : 299 

 (1871). 



Culms slender, 40-80 cm. high, compressed; branches single 

 from the remote nodes. Sheaths very smooth; blades rigid, acute, 

 10-20 cm. long, 2-4 mm. wide, glabrous, sometimes thinly hairy to- 

 ward the base. Spathes 4-6 cm. long, narrow, obtuse or acute, as 

 long as the exserted part of the jDeduncle or longer. Eacemes 4-7 

 cm. long, slender, pilose; joints as long as the sessile spikelets; the 

 apex 1 mm. wide, unequally 2-toothed, glabrous on the back, ciliate 

 on the margirs. Sessile spikelets 7 mm. long; first glume firm, 

 linear, acuminate, subbimucronate, glabrous, pale red, obscurely 

 3-nerved, the callus with a stout tuft of hairs; second glume acute, 

 1-nerved, the keel scabrous; third glume ciliate, the fourth divided 

 nearly to the base, the awn 15 mm. long. Pedicellate spikelets on 

 slender peduncles as long as the joints, ciliate on the edges; spike- 

 lets subulate, 3 mm. long. 



Mexico, Palmer 7. 



10. A. fastigiatus Sw. Fl. Ind. Occ. 26 : 207 (1788). 



Perennial; culms 60-90 cm. high, terete, branching, flower- 

 bearing branches in threes, fastigiate, smooth. Sheaths loose, 

 keeled, scabrous or smooth; ligule acute, many-nerved, glabrous, 

 wider than the blade, 6-10 mm. long; lower blades sometimes 30 

 cm. long, 1-4 mm. wide, all narrow at the base, setaceously acu- 

 minate, flat or loosely folded, glabrous or sparingly ciliate at the 

 base. Spathes linear-lanceolate, 5-7 cm. long. Racemes 4-7 cm. 



