MONOECIA.— TETRANDRIA, 32d 



DIANDRIA. 



>28. PODQSTEMUM. sterile fl. Perianth 0. 

 Stam. 2, affixed to a common pedicel, fertile 

 fl. Germ, ovate ; stig. 1, sessile. Caps. 2- 

 celled, 2-valved, many-seeded. Seeds minute 



TRIANDRIA. 



529. TYPHA. Ament cylindrical, dense, sterile 



fl. Perianth 0. Stam. 3 together, upon a chaf- 

 fy or hairy receptacle, united below into 1 fila- 

 ment, fertile fl. below the sterile. Perianth 

 0. Pericarp pedicellate, surrounded with a 

 hairy pappus at the base. 



530. SPARGAN1UM. Ament globose, sterile fi 



Cat. 3-leaved. fertile fl. Cal. 3-leaved, 

 Drupe dry, 1 — 2-seeded. 



531. CAREX. Flowers collected into an imbricate 



ament. Glume I -flowered. Cor. ventricose : 

 1-valved, persistent, including the caryopsis. 



532. SCLERIA. sterile fl. Cal. 2- or 6-glumed, 



many-flowered. Valves of the Cor. unarmed 

 fertile fl. Cal. 2 or 6 glumed, 1 -flowered. 

 Cor. 0. Stig. 1 — 3. Nut coloured, subglo- 

 bose. 



533. TRIPSACUM. sterile fl. Glume 2-flowered ; 



the exterior flower sterile, the interior neuter. 

 Valve of the Cor. membranaceous, fertile 

 fl. Glume 2-flowered ; exterior valve resem- 

 bling an involucrum, perforate near the base 

 Cor. 2-valved. Styles 2. Seed 1. 

 >34. COMPTONIA. sterile fl. Ament cylindric ; 

 scales 1 -flowered. Cor. 0. fertile fl. Anient 

 ovate. Cal. at length 6-leaved. Cor. 0. Stylet 

 -\ JVut oval, 1 celled. 



TETRANDRIA. 



ERIOCAULON. Florvers collected into a coin 

 pact scaly head, sterile fl. in the disk. Pe- 

 rianth sinele, 4-cleft ; the 2 inner segments 

 Ee 



