PENTANDRIA. XXXlii 



with opposite leaves a-nd tubular flowers. GENTIAN 

 TRIBE. P. 412. 



26. CUSCUTA. Capsule 4-seeded. Leafless, parasitic 

 plants, with red, tangled stems, and wax-like flowers. 

 BINDWEED TRIBE. P. 423. 



ORDER III. TETBAGYNIA. 4 Pistils. 



f Sepals 4 ; petals 4 ; capsule many 



27. SAGINA. | seeded, opening with valves or 



28. MCENCHIA. \ teeth. Minute plants with oppo- 



29. CERASTIUM. site leaves and white flowers. 



[ CHICKWEED TRIBE. P. 87. 



30. RADIOLA. Sepals 4, connected below; petals 4; 

 capsule 8-valved, 8-celled. A minute much branched 

 plant, with smooth leaves and white flowers. ELAX 

 TRIBE. P. 107. 



31. TILL.EA. Sepals 4 ; petals 4 ; carpels 4. A mi- 

 nute plant with fleshy leaves and greenish white 

 flowers. STONECROP TRIBE. P. 232. 



32. ILEX. Corolla wheel-shaped; fruit a 4-seeded 

 berry. A hard-wooded tree or shrub with prickly 

 leaves and scarlet berries. HOLLY TRIBE. P. 405. 



^ Perianth single of 4 leaves or 

 ; fruit of 4 nuts. Submersed 



33. POTAMOGETON. 



34. EUPPIA. 



aquatics with long stems, mem- 

 branous or floating, leathery 

 leaves, and inconspicuous green- 

 ish flowers. POND- WEED TRIBE. 

 IP. 644. 



CLASS Y. PENTANDKIA. 5 Stamens. 

 ORDER I MONOGYNIA. 1 Pistil. 



* Perianth double ; corolla of 1 petal ; ovary 4:-cleft } 

 superior. 



1. ECHIUM. 2. PULMONARIA. 3. LlTHOSPERMUM. 



MERTENSIA. 5. SYMPHYTUM. 6. BORAGO. 7. LYCOP- 



