326 BOTANY. 



Oedbb 46. MICEOSPEBM^. Orchids. 



Compound tricarpellary pistil, inferior ; flower-leaves in eacli 

 whorl mostly unlike in shape (flower irregular) ; seeds without endo- 

 sperm. 

 Family Burmanniacese ; Flowers regular ; stamens 3 or 6. (Sp. 50.) 

 Family Orchidacese (The Orchids) : Flowers irregular ; stamens 1 

 or 2. (Sp. 5000.) 



Sub-class 2. DicoTyLEDONE.E. The Dicotyledons. 



Leaves of young sporophore opposite ; leaves of mature sporophore 

 usually reticulate-veined ; fibro-vascular bundles of the stems in 

 one or more rings. 



The Dicotyledons were formerly divided into Choripetalse, Gamo- 

 petalge and Apetalse, hut these artificial groups should no longer be 

 maintained. 



Order 47. THALAMIFLOR.ffi:. Torals. 



Outer whorl (calyx) usually of separate leaves (sepals), and with 

 the other parts of the flower inserted on the flower-axis (torus). 



Suborder Ranales : Pistils 1 to many, monocarpellary (or rarely 

 united) ; stamens generally indefinite ; embryo mostly small in copi- 

 ous endosperm. 



Family Banunoulacese (The Crowfoots) : Petals present, in one 

 whorl or absent ; sepals deciduous ; mostly herbs with alternate 

 leaves. (Sp. 680.) 



Family Dilleniaceae : Petals present, in one whorl ; sepals persistent ; 

 mostly shrubs and trees with alternate leaves. (Sp. 300. ) 



Family Calycauthacese : Petals present, in many whorls ; seeds 

 without endosperm ; shrubs with opposite leaves. (Sp. 5.) 



Family Magnoliacese (Magnolias) : Petals present, in one to many 

 whorls ; receptacle usually elongated ; shrubs and trees with alter- 

 nate leaves and usually large flowers. (Sp. 86.) 



Family Anonaoeae (Anonads) : Petals present, in two whorls of 3 

 each ; endosperm ruminated ; trees or shrubs with alternate leaves. 

 (Sp. 450 ) 



Family Myristicacese (The Nutmegs) : Petals .absent ; pistil 1 (or a 

 second rudiment), 1 -seeded ; endosperm ruminated ; trees or shrubs 

 with alternate leaves and small, inconspicuous, dioecious flowers 

 (Sp. 90.) 



Family Monimiacese: Petals absent; pistils many, 1-ovuled im- 

 bedded in the receptacle ; trees and shrubs with opposite or whorled 

 leaves and diclinous flowers. (Sp. 150.) 



