SYNOPSIS OF THE GENERA. 



-f-f Flowers on one-sided Spikes. 



52, Sparti'Xa, [Page 167.] Inflorescence a one-sided spike. 



Spikelets one-sided, single-flowered, in two rows pressed 

 close to the rachis. Glumes two, unequal, lanceolate, 

 compressed, pointed or awned. Glumelles two, nearl}- 

 equal, lanceolate, compressed. Styles partly united. 



53, Cyn'odon, [Page 168,] Inflorescence a compound spike, 



Spikelets one-sided, in two or more rows. Glumes two, 

 nearly equal, keeled, spreading. Florets single-flowered, 

 Glumelles shorter than the glumes, awnless, compressed, 

 keeled ; the outer valve broadest, enwrapping the shorter 

 inner one, becoming hard, and forming a coat to the ovate 

 seed. 



54, Digita'ria, [Page 169,] Inflorescence a compound spike. 



Spikelets arranged on a zig zag rachis ; Florets two : the 

 outer sometimes wanting : the perfect one of two car- 

 tilaginous, nearly equal, valves; the imperfect one a 

 single valve. Fruit coated with the hardened glumelles. 



Order III, Trigynia. — 3 Pistils. 



55. MoN'TiA, [Page 171.] Calyx inferior, of two ovate abrupt 



pieces, united at the base. Corolla of five unequal petals, 

 united at the base. Capsule one-celled, with three valves 

 and three seeds, 



56. Holos'teum, [Page 172.] Calyx inferior, of five ovate 



pieces. Petals five, jagged towards the extremity. Cap- 

 sule one-celled, opening at the apex with six teeth. Seeds 

 numerous, furrowed on one side, and dotted. 



57. Polycar'pon, [Page 172.] Calyx inferior, of five ovate mu- 



cronate pieces, with membranous margins, and united at 

 the base. Petals five, notched at the extremity. Stamens 

 from three to five. Capsule three-valved, many-seeded. 



Class IV. Tetrandria. — 4 Stamens (equal). 



Order I. Monogynia. — 1 Pistil. 

 * Perianth double. Corolla of one piece, superior. Seed single, 

 1. Dipsa'cus, [Page 173,] Floivers in heads, sun'ounded by a 



