THE DICOTYLEDOXES 



1819 



is sold commercially as Linseed Oil. The residue is made into a hard cake 

 which is broken up and used as a source of protein for feeding cattle. The 



Fio. 1718. — Liiiiim. Vertical section of the 



flower. 



chief importance of the species L. usitatissimum lies in the fibres, which are 

 used in the production of linen, the short fibres being made into tow. The 

 genus is widely distributed in temperate and subtropical regions. 



Fig. 17 1 9. — Limim perenne. Flower. 



RadioJa linoides (All-seed) belongs to a monotypic genus. It is common 

 in Europe and occurs rarely in Britain. In the genus Hugonia the lower 

 twigs of the inflorescence are modified into hooks for climbing. There 

 are eleven tropical species. 



The Oxalidaceae are closely allied to the Geraniaceae, from which they 



