Sub-Class 2. _Hydropterideæ_ 215 Class 2. EQUISETINÆ (HORSETAILS) 221 Sub-Class 1. _Isosporous Equisetinæ_ 221 „ 2. _Heterosporous Equisetinæ_ 225 Class 3. LYCOPODINÆ (CLUB MOSSES) 226 Sub-Class 1. _Lycopodieæ_ 226 „ 2. _Selaginelleæ_ 228 TRANSITION FROM THE CRYPTOGAMS TO THE PHANEROGAMS 234 Asexual Generation of the Cormophytes 234 Sexual Generation; Fertilisation 243 DIVISION IV. GYMNOSPERMÆ 251 Class 1. CYCADEÆ (CYCADS) 252 „ 2. CONIFERÆ (PINE-TREES) 255 Family 1. Taxoideæ 259 „ 2. Pinoideæ 262 Class 3. GNETEÆ 270 Fossil Gymnosperms 271 DIVISION V. ANGIOSPERMÆ 273 Class 1. MONOCOTYLEDONES 274 Family 1. Helobieæ 278 „ 2. Glumifloræ 283 „ 3. Spadicifloræ 297 „ 4. Enantioblastæ 308 „ 5. Liliifloræ 309 „ 6. Scitamineæ 323 „ 7. Gynandræ 328 Class 2. DICOTYLEDONES 334 Sub-Class 1. _Choripetalæ_ 337 Family 1. Salicifloræ 337 „ 2. Casuarinifloræ 339 „ 3. Quercifloræ 340 „ 4. Juglandifloræ 349 „ 5. Urticifloræ 351 „ 6. Polygonifloræ 358 „ 7. Curvembryæ 363 „ 8. Cactifloræ 375 „ 9. Polycarpicæ 377 „ 10. Rhœadinæ 393 „ 11. Cistifloræ 406 „ 12. Gruinales 416 „ 13. Columniferæ 421 „ 14. Tricoccæ 430
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