DICOTYLEDONES. 
xlvii 
69. Santalacece. Perianth superior, 3 — 5-lobed. Stam. 
3 — 5, opposite perianth-lobes. Ovary 1 -celled; ovules 
several, pendulous from apex of central placenta 365 
70. Aristolochiacere. Perianth superior, tubular above, 
3-lobed, or with a dilated irregular limb. Stam. 6 — 12... 366 
71. Empetracett. Dioecious. Perianth of hypogynous 
scales imbricate in several rows. Stam. 3, free. Ovary 
superior, 3 — 9-celled. Ovules solitary. — A small prostrate 
heathlike shrub 366 
72. Euphiyrhiacetr. Mou- or di-cecious. 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 Euphorbia many fl„ 
each of one naked stamen, surround a pendulous 3-lobed 
naked ovary, enclosed by a calyx-like involucre 367 
73. Ceratophyllaceae. Monoecious. Perianth of many 
divisions. Stam. many, sessile ; anth. 2-celled. Ovary 
superior, l-celled. Style 1. — Submerged plants with 
inconspicuous fl. and multifid leaves 371 
74. Callitrichacece. Monoecious. Perianth 0, but often 
2 white bracts. Stam. 1 ; filament long ; anth. l-celled. 
Ovary 4-angled, 4-celled. Styles 2. Fr. of 4, 1-seeded, 
indehiscent carpels. — Aquatic plants 371 
75. Urticacecv. Mon- or di-oecious (rarely perfect). 
Perianth inferior,4 — 5-parted ; in fem. fl. tubular, notched. 
Stam. 4—5. Style filiform or 0 373 
76. CannahinacecM. 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... 374 
77. Ulmacew. Fl. 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 374 
78. Amentifer(je. Mon- or di-oecious. Males in catkins. 
Fem.-perianth 0, or adherent. Fr. bony or membranous 
(or drupaceous in Myrica). — Trees or shrubs 375 
Division 5. GYMNOSPERME.*:. 
79. Coniferce. Anth. and ovules on the scales of sepa- 
rate catkins or cones. — Trees or shrubs 390 
