52 KATTTEAL OEDEEa. 



CLASS II.— MONOCOTYLEDONS. 



In germination the plumule is developed from a sheath-like cavity on one 

 side of the embryo. 



* Perianth none, or of 4: small sepals or bracts. 



LXXIV. Bulriisli family. Flowers unisexual, intermixed with bracts in 

 dense beads or spikes. Fruit a dry nut. 



LXXV. Arum family. Flowers unisexual, often intermixed with bracts, 

 in dense heads or spikes, mostly in a spatlia. Fruit usually succulent. 



LXXVI. Duckweed genus. No distinct stem. Flowers (very scarce) on 

 the edge of the small leaf-like floating fronds. 



LXXVII. Naias family. Floating or submerged plants. Flowers distinct, 

 or in loose spikes. Stamens 1, 2, or 4. Ovaries 1, 2, or 4. 



** Perianth toholli/ or partially petal-like. Ovary apocarpous. 



LXXVIII. Alisma family ; the only British one. 



*** Perianth wholly or partially petal-like. Ovary inferior. 



LXXIX. Hydrocharis family. Floating or submerged plants. Flowers 

 usually unisexual. Perianth regular, with a slender tube. 



LXXX. Orchid family. Perianth very irregular. Anther 2-celled, com- 

 bined with the style in an axile column. 



LXXXI. Iris famUy. Like the AmarylUs family, but stamens 3. Leaves 

 often in two opposite rows. 



LXXXII. Amaryllis family. Terrestrial plants. Perianth of 6 divisions. 

 Stamens 6. 



LXXXIII. Tam family. Twining plants. Klowers unisexual. Perianth 

 regular, of t5 divisions. 



*** Perianth regular. Ovary synearpous, superior. 



LXXXTV. Lily family. Perianth petal-like. 



LXXXV. Rush family. Perianth stiff, or calyx-hke. Capsule 3-ceUed, 

 with several seeds, or one erect seed in each cell. 



LXXXVI. Restio family. Perianth calyx-like. Flowers unisexual. Ovary 

 with one pendulous ovule in each cell. 



**** Perianth rudimentary or none, replaced by chaffy scales or bracts 



enclosing the Jloivers. 



LXXXVII. Sedge family. Leaf-sheaths entire. Each flower in the axil 

 of one bract. 



LXXXVIII. Grass family. Leaf-sheaths split open opposite the blade. 

 Each flower enclosed in two bracts. 



CLASS III.— CBYPT06AMS. 

 No true flowers ; that is, no stamens or pistils. 



LXXXIX. Clubmoss family. Spores in closed capsules on the stem, or 

 in the axils, or in the base of the leaves. 



XC. Equisetum family. Stems jointed, with whorled branches. Spores 

 under peltate scales, in terminal heads or spikes. 



XCI. Fern family. Spores in miuute cases or capsules clustered on the 

 back or margins of the fronds. 



Tiie remaining families of British Cryptogams are not mcluded in the 

 present Flora. 



