440 Rev. S. Haughton on the General Law of Phyllotaxis 



some species in the East Indies and elsewhere. In this case, 

 the whorled structure is perfect, as much so as in Equisetum, 

 although it is an Exogen, and apparently of a high order. 

 Whether this group survives, like other Australian forms, as the 

 representative of lost groups, or is to be regarded as a new and 

 well-developed type, the result of careful selection on the part 

 of the goddess Nature, I leave for the consideration of those 

 acquainted with the secrets of Creation. 



IV. Casuarinese. 



1. Casuarina Lehmanniana. Tasmania. Leaves in whorls of 

 8, alternate. Divergence = y 1 ^. 



2. C. (sp.). Tasmania. Leaves in whorls of 6, alternate. 

 Divergence = y^. 



3. C. (sp.). Australia. Leaves in whorls of 8, alternate. 

 Divergence = T ^-. 



4. C. Miguelii. Tasmania. Leaves in whorls of 8, alternate. 

 Divergence = T ^-. 



5. C. Grumii. Tasmania. Leaves in whorls of 10, alternate. 

 Divergence = ^. 



6. C. quadrivalvis. Tasmania. Leaves in whorls of 10, 

 alternate. Divergence = -$. 



7. C. equisetifolia. Canara, East Indies. Leaves in whorls 

 of 8, alternate. Divergence = y 1 -^. 



8. C. (sp.). Swan River. Leaves in whorls of 4, alternate. 

 Divergence = . 



9. C. Preissiana. Eliza Mountain, Freemantle. Leaves in 

 whorls of 4, alternate. Divergence = |. 



10. C. muricata. Leaves in whorls of 6, alternate. Main 

 stems have leaf-scars of 7-8, alternate. Divergence = y 1 ^. 



11. X'. (sp.). Feejee Islands. Leaves in whorls of 8, alter- 

 nate. TNa^ejrgence = y 1 ^. 



12. C. nancir Leaves of stem, smaller branches, and carpels 

 of fruit cones, in whorls of 5, alternate. Divergence = y 1 ^. 



13. C. (sp.). Swan River. Whorls of stem and fruit, 7, 

 alternate. Divergence = y 1 ^. 



14. C. (sp.). Philippine Islands. Whorls of stem and fruit, 7, 

 alternate. Divergence = ^. 



15. C. distyla. Tasmania. Leaves in whorls of 7, alternate. 

 Fruit carpels in whorls of 7, alternate. Divergence = y^. 



16. C. obesa. Near town of Perth, Swan River : a tree 

 35 feet high. Leaves in whorls of 12, alternate. Carpels in 

 whorls of 12, alternate. Divergence = -%. 



17. C. (sp.). Swan River. Leaves in whorls of 7, alternate. 

 Divergence = y^. 



18. C. (sp.). Swan River. Leaves in whorls of 5, alternate. 



