XXXll 
LINNjEAN synopsis of genera. 
305. Tamus. Perianth 6-parted, superior. Stam. 6. 
298. PoPULUS. FI. in imbricated catkins. Stam. 8. 
282. Mercurialis. Perianth single, 3-parted. Stam. 9. 
305. IIydrocharis. Cal. 3-parted, suj)erior. Pet. 3. Stam. 9. 
306. Stratiotes. Cal. 3-parted, superior. Stam. 12. 
302. JuNiPERUS. Stam. 5, combined. FI. in catkins. Fern. 
fl. 3, scales xdtimately fleshy and united. 
302. Taxes. Stam. 5, combined. Fl. in catkins. Fern. fl. 1, 
scaly below. Perigone ultimately fleshy, cupshaped. 
(Stam. 3. FaZeriawa, N. O. 44. Stam. 4. Iihamnus,'^i.O. 
25. Urtica, N. O. 74. Stam. 8. Sedum, N. 0. 35. Stam. 
12. Stratiotes, N. O. 77 .) 
Class XXIII. POLYGAMIA. 
268. Atriplex. Perigone 2-lobed or 2-parted. Pericarp free. 
Testa crustaceous. 
270 . IIalimus. Perigone 2-lobed. Pericarp adhering to the 
perigone. Testa membranous. 
Class XXIV. CRYPTOGAMIA. 
403. Nat. Order 93. Equisetace^e. Leafless branched plants 
with sheathed articulations. Fructification in terminal 
catkins. 
406. Nat. Order 94. Filices. Leafy plants. Fructification 
attached to the veins, either on the back or edge of the 
leaves. 
417 . Nat. Order 95. Marsileace.®. Creeping plants with 
slender leaves. Fruclification consisting of globular nearly 
sessile coriaceous 3 — 4-celled capsules. 
417- Nat. Order 96. Lycopodiace^e. Plants with imbricated 
leaves. Capsules axillary, solitary. 
