CLASSES, ORDERS, AND GENERA. 



10. Lemna.^ Perianth monophyllous, mebranaceous, urceolate. 



Fruit utricular.— Fresh-water minute floating plants, p. 477. 



11. CYPERACE^. (Flowers glumaceous, imbricated. — Leaves 



with entire sheaths— Cladium and Ehynchospora). p. 488. 



■ 



Ord. 11. DiGYNiA. 2 styles. 



12. Callitbiche. Flowers solitary, axillary. Fruit of 4 cells and 



seeds. — Leaves opposite, p. 381. 



13. GRAMINEiE. Flowers glumaceous, imbricated. Fruit a 



caryopsis, 1 seeded. — Leaves alternate with split sheaths 

 (Anthoxanthum, Hierochloe, and Bromus. p. 521. 



N 



Class IIL TRIANDRIA. 3 stamens. 



Ord. L Monogtnia. 1 style. 



* Perianth superior. 



1. VALERIANACE^, Perianth double. Cor, gibbous at the base, 



5-cleft. Fruit Lsecded, p. 200. 



2. IRIDACE^. Perianth single, petaloid, 6-cleft. p. 438, 



** Flowers inferior {dry and chaffy). 



■m 



3. CYPERACEiE. Flowers each of a single glume, several imbri- 



cated and forming a spikelet. Achene 1- seeded. — Leaves with 

 entire sheaths, p. 488. 



4. GRAMINEiE. Flowers of 2 glumellas, with or without external 



glumes. Caryopsis 1-seeded. — Leaves with split sheaths — 

 (Nardus Sesleria, and Spartina). p. 521. 



5. JuNCus. Perianth 6-partite. Caps. 3-celled, several-seeded. 



p. 459. 



ft 



M 

 J 



Ord. IL DiGTNiA. 2 styles. 



6. GRAMINE^. p. 52L 



Ord. IIL Trigynia 3 styles. 



7. MoNTiA, Cal. of 2 leaves. Caps, solitary, 3-valved, 3-seedcd. 



— stipules none. p. 151. 



8. HoLosTEUM. Cal. of 5 leaves. Caps, solitary, 1 celled, opening 



at the end with 6 teeth. —Stipules none. p. 70. 



9. PoLYCARPON. Cal. of 5 leaves. Caps, solitary, .1 -celled, 3- 



valved. — Stipules membranous, p. 154. 

 10. TiLL^A. CaL of 3 leaves. Carpels 3. — Stipules wanting, p. 



156. 



* This genus, placed here by Linnaeus, is really monoecious, and the suppose;! 

 perianth is a spatha with one barren and one fertile flower. 



