Xlii CLASSES, DmsIONS, AND OEDEES. 



69. 8antalace<B. Perianth superior, 3 — 5-lobed. Stam. 

 3 — 5j opposite perianth-lobes. Ovary 1-celled; ovules 

 several, pendulous from apex of central placenta 312 



70. AristolocMacece. Perianth superior, tubular above, 

 3-lobed, or -with a dilated irregular limb. Stam. 6 — 12 . . 318 



71. Empetraceee. Dioecious. Perianth of hypogynous 

 scales imbricate in several rows. Stam. 3, free. Ovary 

 superior, 3 — 9-celled. Ovules solitary. — A small prostrate 

 heathlike shrub 313 



72. EuphorhiacecB. Mon- or di-oeoious. Perianth 3- 

 parted or 0. Stam. 1 or more. Ovary superior, 2 — 3- 

 lobed and -celled ; each cell with 1 — 2 suspended ovules. 

 Caps, opening with elasticity. — In Eujjhorbia many fl., 

 each of one naked stamen, surround a pendulous 3-lobed 

 naked ovary, enclosed by a calyx-like involucre 314 



73. Ceratophyllaceee, Monoecious. Perianth of many 

 divisions. Stam. many, sessile; anth. 2-celled. Ovary 

 superior, 1-celled. Style 1. — Submerged plants with 

 inconspicuous fl. and multifld leaves 317 



74. CalUtrichacecs. Monoecious. Perianth 0, but often 

 2 white bracts. Stam. 1 ; filament long ; anth. 1-ceUed. 

 Ovary 4-angled, 4^celled. Styles 2. Fr. of 4, 1-seeded, 

 indehiscent carpels. — Aquatic plants 318 



75. UrticacecB. Mon- or di-oecious (really perfect). 

 Perianth inferior, 4 — 5-parted; infem. fl. tubular, notched. 

 Stam. 4^5. Style filiform or 319 



76. Cannabinacees. Dioecious. Perianth inferior, of 5 

 sepals in male, open and hidden in scales of catkin in 

 female. Stam. 5. Styles- 2, long. — Long twining plant . 320 



77. UlmacecB. PI. 2-sexual, not in catkins. Perianth 

 inferior, bellshaped, 4 — 8-cleft. Stam. 4 — 8, on tube, op- 

 posite lobes. Ovary 1 — 2-celled. Styles ^ 2. Fr. dry, 

 flat, winged. — Trees. L. alternate, distichous. Stip. de- 

 ciduous 320 



78. Amentiferce. Mon- or di-oscious. Males in catkins. 

 Fem.-perianth 0, or adherent. Fr. bony or membranous 



(or drupaceous in Myricd). — Trees or shrubs 321 



Division 5. GTMNOSPEEME^. 



79. ConifercB. Anth. and ovules on the scales of sepa^ 



rate catkins or cones. — Trees or shrubs 325 



