240 EXPLANATION OF THE PLATES. 
PLATE THE FOURTH. 
Leaves. 
Fig. 1. Poa arenosa. Graminee. 
a. Leaf long, linear. 
b. Petiole sheathing; sheath slit. 
c. Ligule scalelike. 
Fig. 2. Plantago. Plantaginee. Leaf oval, rounded, 
pointed, many-ribbed. 
Fig. 3. Chamzerops humilis. Palm@. Leaves terminal, 
crowning, petioled, fanshaped, digitate, folded when young ; 
petioles having foliolean spines. 
Fig. 4. Podocarpus elongata. Conifer@. Leaf linear. 
Fig. 5. Pinus Strobus. Alietidee. Leaves fasciculate, 
in fives, needlelike. \ 
Fig. 6. Vitis-Idea punctifolia. Vacciniee. Leaf oval, 
not in the least cut, dotted; edge cartilaginous. 
Fig. 7. Sida rhombifolia. Malvacee. Leaf nearly rhom- 
boid, lanceolate, toothed. 
Fig. 8. Quercus longzva. Corylidee. Leaf oblong, 
sinuated. 
Fig. 9. Barbarea vulgaris. Crucifer@. Leaf lyrate. 
Fig. 10. Salvia officinalis. Laliate. Leaf oval, lanceo- 
late, eared, crenulate. 
Fig. 11. Taraxacum officinale. Composite. Leaf run- 
cinate. 
Fig. 12. Solanum pyracanthos. Solanee. Leaf lanceo- 
late, nearly pinnatifid, thorny. 
Fig. 13. Sonchus fruticosus. Composite. Leaf lanceo- 
late, pinnatifid. 
Fig. 14. Potentilla anserina. Dryadee. Leaf inter- 
ruptedly pinnate, jointless. 
Fig. 15. Cassia occidentalis. Leguminosae. Leaf pari- 
pinnated, jointed; petiole having a cupshape gland a at 
the base. ) 
Fig.16. Gleditsia monosperma. Leguminose. Leaf 
pari-pinnate, jointed ; secondary petioles three-paired ; leaf- 
lets many-paired ; spine super-axillary, three-forked. 
Fig. 17. Vicia. Leguminose. Leaf impari-pinnate, 
jointed, tendril bearing. 
Fig. 18. Coreopsis ferulzefolia. Composite. Leaf bipin- 
nate, twice compounded, jointless. 
