THE DICOTYLEDONES 



1851 



2. Scandicineae. Flowers all generally hermaphrodite, seeds at the 



surface of union deeply forked or hollow. Crystal layer present 

 in the parenchyma around the carpophore. Chaerophyllum, 

 Anthriscus, Scandix, Torilis, Myrrhis. 



3. Coriandreae. Flowers generally all hermaphrodite, seeds at the 



surface of union deeply forked or hollow\ Crystal layer absent. 

 Fruit nutlike with woody epidermal layer. Coriandrum. 



4. Smyrnieae. Flowers generally all hermaphrodite, seeds with a 



narrow surface of union and mericarp rounded outwards. 

 Smyrnium, Conium. 



5. Ammineae. Flowers generally all hermaphrodite, seeds flattened at 



surface of union, primary costae all alike, seeds semi-circular in 

 section. Biipleuriim, Apiiim, Petroselinum, Aciphylla, Canim, 

 Ciciita, Pimpifiella, Seseli, Foeniculum, Oerianthe, Ligusticum, 

 Aethusa. 



6. Peiicedaneae. Flowers usually hermaphrodite. Seeds narrow in 



section flattened at surface of union, lateral costae much broader 

 and often forming wings. Angelica, Ferula, Heracleum, Peuce- 

 datiiim, Dorema, Pastinaca. 



B. Lateral costae equal to or larger than the primary ones. Vittae in 

 furrows or on secondary well-marked costae. 



7. Laserpitieae. Secondary costae often expanded into broad, undivided 



or wavy wings. Laserpitium, Thapsia. 



8. Dauceae. All costae provided with spines. Daucus. 



The Hydrocotyloideae are a relatively small sub-family of which the 

 genus Hydrocotyle is the most important. There are seventy-five species, 

 cosmopolitan but mainly restricted to the southern hemisphere. H. 

 vulgaris occurs in Britain and is widely distributed in Europe, western 



Fig. i7s6. — Hydrocotyle vulgaris. Marsh Pennywort. Pollination. Left, early, staminal 



stage. Right, later female stage. (After Kuuth.) 



