AND ORDERS. 461 



B. Anther parallel with the stigma; pollen powdery. 

 Ex. Neottia, (Bird's nest,) 



Spiranthes, (Ladies' tresses.) 



C. Anther, terminal, presistent ; pollen powdery. 

 Ex. Arethusa, (Arethusa,) 



Pogonia, (Pogonia,) 

 Calopogon, (Calopogon.) 



D. Anther terminal, opercular, deciduous ; pollen waxy. 

 Ex. Cymbidium, (Tuberous Cymbidium.,) 



Malaxis, (Malaxis.) 



ORDER 2. DIANDRIA. Two Stamens. 

 Ex. Cypripedium, (Ladies 1 Slipper.) 



ORDER 3. HEXA\DRIA. Six Stamens. 

 Ex. Aristolochia, (Virginia snake root.) 



CLASS XXI. MONCECIA. Stamens and pistils in 

 different flowers, but on the same plant, so that some 

 flowers are fruitful, while others are barren. ORDERS 8. 



ORDER 1. MONANDRIA. One Stamen. 

 Ex. Zostera, (Grass-wack, Eel-grass,) 

 Zannichellia, (Horned pondweed.) 



ORDER 3. TRIANDRIA. Three Stamens. 

 Ex. Eriocaulon, (Pipewort,) 

 Carex, (Sedge Grass,) 

 Typha, (Water Flag,) 

 Comptonia, (Sweet Fern,) 

 Zea, (Indian Corn.) 



ORDER 4. TETRANDRIA. Four Stamens. 

 Ex Alnus, (Common Alder,) 

 Urtica, (Nettle,) 

 Moms, (Mulberry.) 



ORDER 5. rPENTANDRiA. Five Stamens. 

 Ex. Ambrosia, (Bitter treed. Roman wormwood,) 

 Xanthium, (Sea Burdock.) 



ORDER 6. HEXANDRIA. Six Stamens. 

 Ex. Zizania, ( Wild Rice, Water Oats.) 



ORDER 7. POLYANDRIA. Many Stamens. 

 Ex. Sagittaria, (Arrow head,) 

 Arum, (Indian Turnip,) 

 Castanea, (Chestnut Tree,) 

 Quercus, (Oak,) 

 Juglans, (Walnut.) 



