EXPLANATION OF THE PLATES. 



PLATE IV. 



Fig. 1. Punctured tubes and spiral vessels of the root of 

 Cissampelos Pareira L., (276, 277.) 

 % Section of the buds of the common Alder, (304.) 

 3, 4. Simple buds of the Tulip-tree, with the three fol- 

 lowing series, (304.) 



5. Buds of the common Ash, (ib.) 



6. Buds of Mespilus glandulosa^ (ib.) 



7. Buds of Salishuria adiantifolia Sm., (ib.) 



8. Buds of the Guelder-Rose bush, (243.) 



9. Leaf of Gymnostomiim ovatum^ the nerve of which 



passes into two processes (nervus lamellatus), (49.) 



10. Columna genitaUum of Bletia Tancarvillece R. Br. 



At its upper part the column is shaped into the 

 clinandrium of Richard, on both sides of which the 

 staminodia stand. The clinandrium has under it 

 the rostellum, which again has the stigma strongly 

 shaded under it, with which it is closely connected* 

 The anther is consequently epigynous. 



11. Four connected masses of pollen of the same plant, 



(107.) 



12. The four loculi of the clinandrium, in which the 



pollenous masses are contained, (107.) I have not 

 found the partition any where so distinct as it is 

 here figured. 



13. Flower of Malva umhellata, Monadelphia. The 



veins in the petals are spiral vessels, (324.) 



14. Section of the same flower ; the tube of filaments 



united with the corolla : expanded below, the fila- 

 ments and corolla being of the same nature, (191.) 



15. Pollen of the same plant, (107, 335.) 



16. Flower of Pogostemon plectranthoides Desfont. The 



corolla is almost reversed (resupinata) : for the fila- 

 ments are bent downwards, whilst in the related 

 genera they stand erect. The undivided Hp is pro- 



