540 
EXPLANATION OF THE PLATES. 
PLATE THE FOURTH. 
Leaves. 
Fig. 1 . Poa arenosa. Graminees. 
a. Leaf long, linear. 
1. Petiole sheathing ; sheath slit. 
c. Ligule scalelike. 
Fig. 5. Plantago. Plantaginece. Leaf oval, rounded, 
pointed, many-ribbed. 
Fig. 3. Chamserops humilis. Palmce. Leaves terminal, 
crowning, petioled, fanshaped, digitate, folded when young ; 
petioles having foliolean spines. 
Fig. 4. Podocarpus elongata. Conifer ce. Leaf linear. 
Fig. 5. Pinus Strobus. Abietidece. Leaves fasciculate, 
in fives, needlelike. 
Fig. 6. Vitis-Idsea punctifolia. Vacciniees. Leaf oval, 
not in the least cut, dotted ; edge cartilaginous. 
Fig. 7. Sida rhombifolia. Malvaceae \ Leaf nearly rhom- 
boid, lanceolate, toothed. 
Fig. 8. Quercus longaeva. Corylidees. Leaf oblong, 
sinuated. 
Fig. 9. Barbarea vulgaris. Cruciferce. Leaf lyrate. 
Fig. 10. Salvia officinalis. Labiates. Leaf oval, lanceo- 
late, eared, crenulate. 
Fig. 1 1 . Taraxacum officinale. Composites. Leaf run- 
cinate. 
Fig. 12. Solanum pyracanthos. Solanece. Leaf lanceo- 
late, nearly pinnatifid, thorny. 
Fig. 13. Sonchus fruticosus. Composites. Leaf lanceo- 
late, pinnatifid. 
Fig. 14. Potentilla anserina. Dryadece. Leaf inter- 
ruptedly pinnate, jointless. 
Fig. 15. Cassia occidentalis. Leguminosce. Leaf pari- 
pinnated, jointed ; petiole having a cupshape gland a at 
the base. 
Fig. 16. Gleditsia monosperma. Leguminosce. Leaf 
pari-pinnate, jointed ; secondary petioles three-paired ; leaf- 
lets many-paired ; spine super-axillary, three-forked. 
Fig. 17. Vicia. Leguminosce. Leaf impari-pinnate, 
jointed, tendril bearing. 
Fig. 18. Coreopsis ferulaefolia. Composites. Leafbipin- 
nate, twice compounded, jointless. 
