VARIETIES OF INSERTION IN LEAVES. 147 
leaf is fixed to the petiole by a point more or less within its 
margins, as in the Indian Cress (fig. 280), and Castor-oil plant 
(fig. 332), the leaf is termed peltate ; when the petiole is absent, 
Fie. 281, 
Fic. 280. 
Fig. 280. Peltate leaf of 
the Indian Cress (770- 
peolum).—Fig. 281. 
Amplexicau! petiole of 
Angelica, 
so that the blade arises directly from the stem, it is said to be 
sessile (fig. 286) ; when a leaf is enlarged at its base and clasps 
the stem from which it springs, it is amplexicaul, clasping, or em- 
Fic. 282. Fie. 284, 
Fig. 282. Sheathing leaf of a Grass. 
of Thistle.—— Fig. 284. Perfoliate leaf of a species of Hare’s-ear ( Bupleu- 
rum rotundifolium).—— Fig. 285. Connate leaves of a species of Honey- 
suckle (Lonicera Caprifolium). 
Fig. 283. Decurrent leaf of a species 
bracing ( fig. 281), as in Fool’s Parsley ; or if it forms a complete 
sheath around it, as in Grasses generally (figs. 282 and 37 4, q), it 
is said to be sheathing. When a leaf is prolonged from its base, 
so as to form a winged or leafy appendage, down the stem, as in 
L 2 
