_Terminal_. Situated at the end of a branch.

_Ternate_. In threes.

_Tetrahedral_. Having, or made up of, four faces (triangles).

_Thorn_. A stiff, woody, sharp-pointed projection.

_Tolerant_. Capable of enduring more or less heavy shade.

_Tomentose_. Densely p.u.b.escent with matted wool.

_Toothed_. With teeth or short projections.

_Torus_. The part of the axis of a flower which bears the floral organs.

_Transverse_. Said of a wood section made at right angles with the axis of the stem; across the grain.

_Tree_. Usually defined as a plant with a woody stem, unbranched at or near the base, reaching a height of at least 15 feet.

_Trunk_. The main stem of a tree.

_Turbinate_. Top-shaped.

_Umbel_. A simple inflorescence of flowers on pedicels which radiate from the same point. Page XIV.

_Umbellate_. Arranged in umbels.

_Undulate_. With a wavy margin or surface. Page XIII.

_Unis.e.xual_. Of one s.e.x, either staminate or pistillate; not perfect.

_Veins._ Threads of fibro-vascular tissue in a leaf, petal, or other flat organ.

_Villose_ or _Villous_. Covered with long, soft hairs.

_Viscid._ Glutinous; sticky.

_Whorl._ An arrangement of leaves or branches in a circle round an axis.

_Wood._ The hard part of a stem lying between the pith and the bark.

_Woolly._ Covered with long and matted or tangled hairs.