472 



CONSERVATIVE ORGANS. [LECT. IX, 



is rolled lengthways in a spiral manner, one mar- 

 gin forming the axis round which the other turns, 

 as in the Plum genus, Prunus ; the Lettuce 

 tribe, Lactuca ; the Cabbage, Brassica, and many 

 Grasses, &c. In the marginal cut, g. displays this 

 form of foliation in a section of the unrolled leaf 

 of Indian Corn, Zea Mays. 



2. The Involute (Involuta), in which each 

 lateral margin of the leaf is rolled in- 

 wards ; as in the gems of the Honey- 

 suckles, Lonicerae ; and the Violets, 

 Violae, &c. In the marginal cut, e. 

 is a section of the unexpanded leaf 

 of the Yellow Water Lily, Nuphar 

 lutea. 



3. The Re volute (Revoluta), in 

 which the lateral margins are rolled 

 as in the gems of Rosmary, Ros- 

 marinus officinalis; and of the Primrose genus, 

 Primula, &c. In the marginal cut, f. is a sec- 

 tion of the unexpanded leaf of Patience Dock, 

 Rumex patientia. 



4. The Circinal (Circinata), in which the leaf 

 ^ is rolled from the apex to the base, as 

 in the Ferns, Filices; the divisions of 

 the leaf, as represented at a. a., in 

 the marginal cut, being rolled upon 

 the mid-rib, which is also rolled from 

 to c. carrying the divisions in its turns. 

 2 



outwards 



