258 MONCEC. MONAND. 



of them abortive. Style], Stigmas 3. A^w/ (acorn) 1- celled, 

 1 -seeded, surrounded at the base by the enlarged, cup-shaped 

 irivolucre. 



21. CoRYLUs. Barren Fl. in a cylindrical catkin, its scales 3- 

 cleft. Perianth 0. Stam. 8. Anthers 1 -ceiled. 



Fertile FL Perianth obsolete. Germens several, surround- 

 ed by a scaly involucre. Stigmas 2. Nut 1 -seeded, surround- 

 ed at the base with the enlarged, united, coriaceous scalee of 

 the involucre. 



20. Carpinus. Barren Fl. in a cylindrical catkin ; its scales 

 roundish, ciliated at the base. Stam. 8 — 20. 



Fertile FL in a lax catkin ; its scales large, foliaceous, 3- 

 lobed, 1 -flowered. Involucre 0. Perianth of 1 leaf, urceolate, 

 6-dentate, incorporated with the 2-celled germen, of which 

 1 cell is abortive. Styles 2. Nut ovate, striated, 1 -seeded. 



19. Betula. Barren Fi.\n a cylindrical catkin, its scales 3- 

 flowered. Perianth 0. Stam. 10 — 12. 



Fertile FL Scale of the catkin imperfectly 3-lobed, 3-flow- 

 ered. Perianth 0. Styles 2. Germens compressed, 2-celled, 

 1 abortive. Nuts compressed, with a membranaceous margin, 

 1 -seeded. 



14. Arum. SpaMa of 1 leaf, convolute at the base. PerianthO. 

 Spadix with germens at the base. Stam. (sessile) near the 

 middle of the spadix, which is naked above. Berry 1 -celled, 

 1 -seeded. 



6. MONADELPHIA. 



22. PiNUs. Barren Fl. in crowded racemose catkins ; its scales 

 peltate, bearing 2 1 -celled, sessile anthers. Perianth 0. 



Fertile FL in an ovate catkin ; its scales closely imbricated, 

 2- flowered. Perianth 0. Pericarp 1 -seeded, terminated by 

 a long winged appendage, and covered by the imbricated 

 scales forming a cone [strolilus), 



{Typha. Ord. Triandr.) 



1. MONANDRIA. 



1. ZANNICHELLIA. 

 1 . Z. palustris {horned Pondweed), anthers 4- celled, stigmas en- 

 tire, pericarps toothed on the back. Light/, p, 534. JS. B. 

 t. 1844. 



Hab. Ditches and stagnant waters, FI.Aug. Q. 



Floating. Stems long, filiform, branched. Leaves opposite, linear, 



entire. Flotuers ^ixillary, from a membranaceous bractea. Fertile 

 Jl. upon a very short stalk, from the base of which arises a single 



naked anther, upon a long white //awew^ 



