and tough. It is then called a WOODY stem. But, if it is soft and brittle, it is an HERBACEOUS stem. The stem schedule consists now of the following questions:

Appendages?

Leaf-position?

SCHEDULE EIGHTEEN.

Leaf-arrangement?

Shape?

Attitude?

Color?

Surface?

Size ?

Structure?

NOTE.-In schedule eighteen, as in schedule nine, no picture is described, because two of the questions now added, viz., Color? and Structure? relate to features that cannot be easily represented in a picture, while size and surface, as seen in nature, are so unlike pictorial presentations, that an example given here would be but a poor guide in schedule practise. The descriptive terms used in answering these questions are so familiar as not to need illustration.

CHAPTER III.

THE INFLORESCENCE.

INFLORESCENCE.-The way flowers are placed upon plants is called their inflorescence.

EXERCISE XXVIII.

Solitary and Clustered Inflorescence.

FIG. 144.

Solitary Inflorescence.

FIG. 145.

Clustered Inflorescence.

SOLITARY INFLORESCENCE is where only one flower grows upon a flower-stem. Fig. 144.

CLUSTERED INFLORESCENCE is where several flowers grow from the same flower-stem.

Flowers, or flower-clusters without stems, are said to be sessile.

NOTE. This and the following exercise should be dealt with in the same manner as the first exercises in the chapters upon the leaf and stem.

EXERCISE XXIX.

Parts of the Inflorescence.

FIG. 146.

Peduncle.

-Peduncle.

PEDUN'CLE.-The stem of a solitary flower, or of a flower cluster.

BRACTS.-The small leaves of a flower-cluster on the peduncle, or rachis.

IN'VOLUCRE.-A whorl of bracts.

PED'ICEL.-One of the flower-stems in a cluster.
BRACT'LETS.-Very small leaves growing upon

pedicels.

RA'CHIS.-The continuation of a peduncle, from which flowers branch off.

RECEPTACLE.-The top of a peduncle, from which several flowers start together.

F