GR AMINES. 537 



Division VI. PAPPOPHOREJE. — Sjyikelets with the lowest flower fertile, the superior 

 usually abortive ; third and following glumes multi-'S-fld, with the lobes awned. Stig- 

 mas projecting from the summit of the flower. 



23. PAPPOPHORUM, Schreb. 



Spikelets with scveral-1, distaut, imperfect flowers above the fertile one: third and fol- 

 lowing glumes 9-13-awned. — Ligular border dilate ; panicle contracted. 



45. P. alopecuroides, V. Perennial, stout, glabrous, ("or pubescent at the 

 sheaths ") ; panicle long, cylindrical, pale : branches at length slightly loosened ; spikelets 

 with 2-3 superior rudiments: sterile glumes 1-nerved, fertile \'S-nerved, imperfect ones 

 9-15-awned. — Vahl, Symb. t. 51. Kth. R£v. t. 131, 132. — P. macrostachyum and 

 laguroideum, Schrad. — 3'-4' high ; panicle 2"-12" long. — Hab. Trinidad !, Cr., La Tinta ; 

 [Brazil to Uruguay]. 



Subtribe 3. CHLORLBEM. — Spikelets sessile or shortly pedicellate : lowest glume 

 placed against the axis. Sterile glumes 2, keeled-\-nerved, persistent : rhachis de- 

 ciduous. 



24. BOUTELOUA, Lag. 



Spikelets with ] (-2) fertile, shortly stipitate flowers below, and 1-several distant imper- 

 fect ones above them. Sterile glumes awnless, third and following ones 3-5(-7)-dentate : 

 the teeth of all or chiefly the imperfect ones awned. Stigmas projecting laterally from the 

 flower . — Spikes racemose or solitary : axis produced beyond them. 



Sect. Heterostega, Desv. — Spikes racemose .- spikelets alternating along the edge of the 



flattish axis. 



46. B. litigiosa, Lag. Root fibrous ; stems low, geniculated-ascending ; leaves short, 

 flat, or convolute, filiate or glabrescent at the base : ligule shortly ciliate ; spikes alternate : 

 spikelets 6-10, distant ; sterile glumes lanceolate-acuminate, the longer equalling the in- 

 ternodes of the axis; fertile flower single, bearded at the base, 3-toothed or shortly 3- 

 awned : upper rudiment reduced to a long, 3-partite, exserted awn. — Sw . Obs. t. 2. f. 2. — 

 Aristida americana, Sw. Heterostega juncifolia, Desv. (non Kth.). Eutriana bromoidcs, 

 Trin. {non Kth.).— Leaves \"-2", sterile glumes 1 i'"-2'", spikelets (the awn included) 4'" 

 long. — Hab. Jamaica (Sw.), in the southern sandy districts ; Antigua !, Wullschl. ; [Vene- 

 zuela!]. 



47. B. elatior, Gr. (n. sp.). Root fibrous; sterns slender, erect; leaves narrowly 

 liuear, flat, ciliate, with long soft hairs near the base : ligule shortly ciliate ; spikes alter- 

 nate : spikelets 3-5, distant ; sterile glumes ovate, acuminate, the longer about half as 

 long as the internode of the axis , fertile flower single, bearded at the base, 3-toothed or 

 shortly 3-awned : upper rudiment reduced to a long, 3-partite, exserted awn. — Allied to 

 B. aristidoides (Eutriana, Kth. N. Gen. t. 695), which has narrower sterile glumes. — 1 V-3' 

 high ; inferior leaves 6", sterile glumes 2'", spikelets (the awn included) 4'" long. — Hab. 

 Antigua !, Wullschl., at Grace bay, S. Johns. 



25. LEPTOCHLOA, P. B. 



Spikelets several-inany-fiowered, pedicellate in compound racemes. Sterile glumes awn- 

 less, fertile awnless or' simply awned. Stigmas projecting laterally from the flower. Embryo 

 "slender." — Annual, erect grasses ; leaves flat ; spikelets distichous-1 -sided. 



Dinebra, Jacq. (L. arattica, Kth.), is to be excluded, as by the stigmas projecting below 

 the summit of the flower and sessile spikelets it approaches Eleusine. 



48. I». mncronata, Kth. Spikelets 2-4-flowered, awnless ; sterile glumes mucronate- 

 acute, fertile bluntish, slightly ciliate : rhachis glabrous. — Jacq. Eclog. Gram. t. 4. — 

 Eleusine, Mich. E. filiformis, Pers. L. filiformis and tenerrima, R. S. L. pellucidula, 



