MR. J. MIERS ON TWO GENERA OF PLANTS FROM CHILE. 147 



terminated by a small, dark-coloured mammilla ; the cotyledons are thick and fleshy, four 

 times the length of the radicle, and of equal diameter. 



EXPLANATION OE THE PLATES. 

 Tab. XVII. 



Fig. 1. Oxytheca spiculata : natural size. 



Fig. 2. An involucre with a portion of its peduncle, showing the flowers exserted. 



Fig. 3. The same, cut open to show the insertion of the pedicels and bracts. 



Fig. 4. A young flower-bud with its pedicel and bract. 



Fig. 5. A bract seen before and behind. 



Fig. 6. A flower with a portion of its pedicel. 



Fig. 7- The same, with the sepals thrown back to show the petals. 



Fig. 8. The same, with the sepals and petals removed, exhibiting the stamens inserted upon the 



gynophorus. 

 Fig. 9. An anther seen in front. 



Fig. 10. The same, seen from behind, showing how the filaments are attached. 

 Fig. 11. The pistil upon its stipitate gland or gynophorus, with the stamens removed. 

 Fig. 12. The same, with the styles become reflexed. 

 Fig. 13. A longitudinal section of the same, showing the erect ovule. 

 Fig. 14. The achenium enclosed in the persistent and withered floral envelopes. 

 Fig. 15. The same, with the floral covering removed. 

 Fig. 16. The seed. 



Fig. 17- A longitudinal section of the seed, showing the embryo enclosed in its albumen. 

 Fig. 18. The embryo extracted. 



N.B. Figs. 2, 3, 4 & 5 are magnified on the same proportion. 



Figs. 6, 7 5 8 & 12 to 18 are more highly magnified upon one equal scale. 



Tab. XVIII. 



Fig. 1. Oxycladus aphyllus. 



Fig. 2. A flower, showing the mode of aestivation of the corolla. 



Fig. 3. The same, expanded. 



Fig. 4. A corolla, cut open to show the stamens. 



Fig. 5. An anther, viewed in front; showing the insertion of the filament upon the anterior side of the 



connective, and the pollen-cells in the act of dehiscence. 

 Fig. 6. The same, seen from behind. 

 Fig. 7. The same, after dehiscence. 

 Fig. 8. The pistil, seated upon its hypogynous gland within the calyx, which is cut open and folded 



back, to show its unequal teeth. 

 Fig. 9. The stigma, seen in front. 

 Fig. 10. The same, shown edgeways. 

 Fig. 11. The ovarium, seated upon its hypogynous glandular cup. 



