VEINS. 87 
a. In our description of individual 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 
on the length of the veinlets in relation to each other, and to the 
midvein. If the middle veinlets are longer than therest, the leaf 
will be 
1, Orbicular (roundish), as in Pyrola rotundifolia. 
FIG. 29.— Figures of feather-veined leaves. The numbers refer to paragraphs. a, deltate 
leaf of Populus. 
2. Elliptical (oval), as in Lespedeza prostrata ; or 
3. Oblong (narrow-oval). Ex. Arenaria lateriflora. 
If the lower veinlets are longer than the rest,the leaf will be 
4. Ovate (egg-shaped), as in the Mitchella repens, or 
5. Lanceolate (lance-shaped), narrow, 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 like a spathula), as in the daisy. 
Again, if the lowest veinlets are longest, sending off veinulets 
backwards, the leaf will be 
8. Cordate (heart-shaped), like the ovate fcrm, with a hollow 
(sinus) at the base, as in the lilac. 
9. Auriculate, having ear-shaped lobes at the base. Ex. 
sage. 
5 ge 
