Texture

Leaves vary as to texture, and may be—

coriaceous, or leathery;
succulent, or juicy;
scarious, or dry and thin;
fleshy, or thick;
herbaceous, or thin.

Arrangement

According to their arrangement on the stem, leaves are—

alternate, when distributed singly at different heights on the stem;

opposite, when two stand opposite each other at the nodes;

whorled, when more than two are borne at a node, equidistant in a circle around the stem.