RONUNCULUS SP. 159 



If all or some of the stem is aerial, compare with the aerial 

 stem of Trillium as to: 



5. Form and size. 



6. Position. 



7. Nodes and internodes. 



8. Branching. 



II. ROOTS. Compare with Trillium as to: 



1. General appearance. 



2. Branching. 



3. Number. 



III. LEAVES. Compare with Trillium as to: 



1. Position of the stem. 



2. Form, size, and number. 



3. Division into two regions, the expanded leaf-blade, or 

 lamina, and the leaf-stalk, or petiole. 



4. Veining. 



5. The leaf margin. 



IV. THE FLOWER. Compare with Trillium as to: 



1. The distribution of flowers over the stem. 



2. Floral organs present. 



3. Number and arrangement of organs with reference to or- 

 gans of other sets. 



4. Note that in Ranunculus the many carpels are separate, 

 each forming a simple pistil. 



V. DRAW, showing general characters of roots, stem, leaves, 

 and flowers. 



MINUTE STRUCTURE. 

 I. THE STEM. 



Make a cross-section of the stem * and examine, observing; 

 i. The peripheral region or cortex. 



o. Outermost protecting layer (epidermis). 

 6. Surface hairs and where they arise. 



1 This stem may be readily sectioned free-hand. 



