22 HOKTUS GRAMINELS WO J5 U RN ENSIS. 



shaped, many-flowered, crenated ; calyx two-valved, 

 equal ; corolla one-valved ; seed-vessel, none, the corolla 

 encloses the seed, which is flat on one side and convex 

 on the other. 

 CORNUCOPIiE cucullatum, annual ,• spike awnless, cup- 

 shaped, crenate. 

 POMMEREUELLA. Generic character : spikelets sitting, 

 two-rowed ; calyx two-valved ; three -six -flowered, 

 flowers short; corolla two-valved, the inferior one with 

 four teeth, segments bristled, awn dorsal, flexuose from 

 between the smaller segments; spikes simple, culms 

 branching, seed smooth. 

 cornucopia, per. Nat. East Indies. 

 monoica. Nat. East Indies. 

 CENCHRUS, Serpent-grass. Generic character : invo- 

 lucrum enclosing from three to five spikelets, often 

 double, exterior furnished with stiff bristles, interior, 

 one leaf, multitid ; segme)its lanceolate, nearly equal ; 

 calyx two-valved, two-flowered ; inferior florets mascu- 

 line, superior bisexual ; glumes of the corolla two, lan- 

 ceolate, acute, awnless ; germen marginate ; spike com- 

 pound. 

 trihuluides, ann. caltrop serpent-grass, nat. of Virginia and 



the sea coasts of Florida. 

 echinatus, ann. hedgehog serpent-grass, nat. Arabia. 

 piuigens, arm. sharp-pointed serpent- grass, nat. of the hot 



half-inundated plains of Peru, near Guayaquil. 

 rufescens, ann. brown serpent-grass, nat. of Mascar, grow- 

 ing in sands. 

 ramosissimus, ann. branching serpent-grass, nat. of 



Egypt. 

 parvijloi'us, ann. small flowered serpent-grass, nat. of 



Porto-Rico. 

 setigerus, ami. bristly serpent-grass, nat. Arabia. 

 geniculatus, ann. knee-jointed serpent-grass, nat. of the 



Cape of Good Hope. 

 muricatus, ann. caltrop-like serpent-grass, nat. of the 



East Indies. 

 purpurescois, ann. purpleserpent-grass, nat. of Japan. 



