32 OF HAIRS, PRICKLES, ETC. 
principal forms: trifoliate (pl. 8. f. 4.), as in the 
Clover and Trefoil, in which the petiole bears three 
leaflets: pinnate, as in the Bitter Vetch (pl. 12. f. 1.): 
unequally pinnate, as in the common Rose (pl. 3. f. 1.), 
Mountain Ash, Walnut, and False Acacia (f. 5.); as 
there is a single leaflet at the end of the leaf, which is 
not the case in the Bitter Vetch: dipinnate, in which 
the petiole supports a number of other petioles, each 
bearing its leaflets, as seen in pl. 12. f. 2.; found in 
some true Acacias. 
List of Plants with Simple Leaves: Elm, serrated ; 
Lime, ditto; Plaintain, and Hyacinth, lanceolate; Oak, 
Hawthorn, Plane, lobed; Dandelion, runcinate, a 
lobed leaf, the teeth pointing to the leaf-stalk, or base; 
Water Cress, pinnatified; Monkshood, palmipartite, 
or divided like the fingers of a hand. 
Compound Leaves; Trefoil, and Wood Sorrel, tri- 
foliate; Bitter Vetch, pinnate; Mountain Ash, Walnut, 
Rose, Jasmine, Robinia, or False Acacia, Bladder 
Senna, pinnate; the orange leaf is supposed to be a 
pinnate leaf, without the side leaflets being produced. 
In the Lupin is seen a leaf which is called a fingered, 
or digitate leaf, and bears some resemblance to the 
Monkshood, which is a simple leaf; so, also, the leaf 
of the Horse Chesnut is considered to be a compound 
leaf, of the same kind as that of the Lupin. 
OF HAIRS, PRICKLES, GLANDS, ETC. 
35. Some Leaves are quite smooth, and polished, as 
those of the Bay Laurel, Aucuba, Camellia; others 
are covered with fine hairs; these hairs when viewed 
