a. In onr description of indii-idual forms, we shall select only the most remark- 

 able, leaving others for explanation in the Glossary. 



The most obvious arrangement is that which is founded upon the modes of the 

 veining ; but it should be premised that different forms of venation often give rise 

 to the same outline. 



232. Of FEATHER-VEINED leaves, the following forms depend 

 upon the length of the veins in relation to each other, and to the 

 midrib. If the middle veins are longer than the rest, the leaf 

 will be 



1, Orbicular (roundish), as in Pyrdla rotundifolia. 



FIG. 29. — Figures of featlier-veined leaves. The numbers refer to paragraplis. a, deUate 

 leaf of Populus. 



2. Elliptical (oval), as in Lespedeza prostrata; or 



3. Oblong (narrow-oval). Ex. Pyrola umbellata. 



If the lower veins are longer than the rest, the leaf mil be 



4. Ovate (egg-shaped), as in the JNIitchella repens, or 



5. Lanceolate (lance-shaped), nan-ow, and tapering to each 

 end. Ex. sweet-william. 



When the veins are most developed towards the summit of 

 the leaf, it becomes 



6. Obovate (inversely egg-shaped), as in the walnut; or 



7. Spathulate (shaped hke a spathula), as in the daisy. 

 Again, if the lowest veins are longest, sending oft" veinlets 



backwards, the leaf will be 



8. Cordate (heart-shaped), hke the ovate form, wnith a hollow 

 (sinus) at the base, as in the hlac. 



9. Auriculaie, having ear-shaped lobes at the base. Ex. 

 sage. 



