10 APETALAE 



Stamens alternate witli the perianth-segments. Flowers solitary or in 

 fascicles Elaeagnus, 172. Elaeagnaceae. 



93. Stamens 5 — 15 ; filaments united at the base only. Anthers opening 



laterally. Perianth 5-toothed. Style slender. Seed without an aril ; 



embryo large Pisonia, 69. Nyctaginaceae. 



Stamens very numerous or with the filaments united throughout their 

 length. Anthers opening outwards. Perianth 2—4-, rarely 5-lobed. 

 Seed with an aril ; embryo small 82. Myristicaceae. 



94. (73.) Ovule straight 95 



Ovule incurved or inverted 96 



95. Perianth 4-parted. Stamens 4. Seed without albumen. Shrubs or trees. 



Flowers in spikes or heads 55. Proteaceae. 



Perianth 9 — 12-parted. Stamens 12 — 16. Seed with a thin albumen. 

 Herbs. Flowers solitary or in pairs in the axils of the leaves. 



Ceratophylhim, 11. Ceratophyllaceae. 



96. Leaves stipulate 97 



Leaves exstipulate 100 



97. Leaves compound, but sometimes with one leaflet only. Ovary tightly 



enclosed by the perianth. Seed exalbuminous. Herbs, undershrubs, 



or shrubs 103. Rosaceae. 



Leaves simple, but sometimes {Moraceae) dissected 98 



98. Anthers 3 — 4-celled. Seed albuminous. Macaranga, 122. Euphorbiaceae. 

 Antliers 2-ceIled. Seed usually exalbuminous 99 



99. Flowers solitary or in fascicles. Stamens straight in the bud. Shrubs 



or trees. Juice not milky 52. Ulmaceae. 



Flowers in spikes, racemes, panicles, or heads, or inserted upon a dilated 

 and often concave receptacle, rarely in fascicles, but then stamens bent 

 inwards in the bud. Shrubs or trees with a milky juice or herbs. 



53. Moraceae. 



100. Anthers opening by valves. Perianth-segments 4 or 6. Seed without 



albumen. Trees or shrubs 84. Lauraceae. 



Anthers opening by longitudinal slits loi 



loi. Stamens numerous. Flowers unisexual. Seed with copious fleshy albu- 

 men. Trees or shrubs 83. Monimiaceae. 



Stamens 8-10 102 



102. Style simple. Seed with a straight embryo and a fleshy albumen or with- 



out albumen 171. Thymelaeaceae. 



Styles 2. Seed with a curved embryo and mealy albumen. P~lowers in 

 panicles Galenia, 72. Aizoaceae. 



103. (72.) Ovules basal or inserted upon a central placenta 104 



Ovules parietal or suspended from the apex of the cell. . . . 108 



104. Perianth of 2 — 3 minute scales. Ovules numerous, inserted upon a central 



placenta. Water-plants 93. Podostemonaceae. 



Perianth of 4 — 5 segments 105 



105. Flowers unisexual or polygamous, 4-merous. Ovules 2. Stigma i. 



