BICOTYIEDONES. Hx 



69. Santalacem. Perianth superior, 3 — 5-lobed. Stam. 

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

 several, pendulous from apex of central placenta 30o 



70. Aristolochiaceee. Perianth superior, tubular above, 

 3-lobed, or with a dilated irregular limb. Stam. 6 — 12 . . 305 



71. Umpetracece. Dioecious. Perianth of hypogynous 

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

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

 heathlike shrub 306 



72. Buphorhiacea. Mon- or di-cecious. Perianth 3- 



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

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

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

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

 naked ovary, enclosed by a calyx-like involucre 306 



73. CeratophyUacets. Monoecioxis. Perianth of many 

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

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

 inconspicuous fl. and multifid leaves 310 



74. CaUitiichaceee. Monoecious. Perianth 0, but often 

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

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

 indehiscent carpels. — Aquatic plants 310 



75. TJrticacem. Mon- or di-oecious (rarely perfect). 

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

 Stam. 4—6. Style filiform or 312 



76. Cannabinacece. 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 . 313 



77. TTlmacets. H. 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 313 



78. Amentifera. Mon- or di-oecious. Males in catkins. 

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



(or drupaceous in Myrioa). — Trees or shrubs 314 



Division 5. GTMNOSPEEME^. 



79. Caniferm. Anth. and ovules on the scales of sepa- 

 rate catkins or cones. — Trees or shiubs 328 



