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Parts.—Petals, the divisions of the Corolla.

Lamina, the expanded portion of the petal.

Claw, , the stem portion of the petal.

Spur, ; s, the hollow portion of certain corollas.

Crown, , a small projection from certain petals (Catchfly).

Cohesion.—Gamopetalous or Monopetalous, petals partially or wholly grown together.

Truncate, toothed, lobed, cleft, parted.

Polypetalous, petals separate.

Adnation.—Hypógynous, corolla attached under the pistil (gynia, pistil).

Perígynous, corolla attached to the calyx. It is thus around the pistil.

Epígynous, corolla attached to the ovary. It is thus upon the ovary which is a part of the pistil.

Form.—Gamopetalous and Polypetalous.

Gamopetalous.	-		Regular.
Urceoiate, urn-shaped (Whortleberry).
Tubular cylindrical (Trumpet Honeysuckle)
Campánulate, bell-shaped (Harebell).
Infundíbular, funnel-shaped (Morning-glory).
Hypocraterimórphous, salver-shaped (Phlox).
Rotate, wheel-shaped (Potato).
Irregular.
Ligulate, strap-shaped (Dandelion).
Lābiate, two-lipped.
Gāleate, upper lip arched (Catmint).
Ringent, both lips arched (Dead-nettle).
Personate, throat closed (Toad-flax).
Polypetalous.	-		Regular.
Rosāceous, petals without claws (Rose).
Liliāceous, petals with claws gradually spreading (Lily).
Caryophyllāceous, long claws enclosed in a tube (Pink).
Crucíferous, four clawed petals in the form of a cross (Mustard).
Irregular.
Papilionāceous, butterfly-shaped (Bean).
Parts.—Vexillum, banner; alæ, wings; carīna, keel.

Æstivation, the arrangement of the floral organs in the bud.

Valvular, pieces met by their margins (Lilac).

Induplicate, margins turned inward (sepals of Clematis).

Reduplicate, margins turned outward (sepals of Hollyhock).

Convolute, or contorted, each piece overlaps its neighbor in one direction (Geranium).

Imbricated, one or more petals wholly outside.

Quincúncial, five petals, two without and two within and the remaining one with one edge outside and the other inside.

Triquētrous, three petals, one without and one within, and the remaining one with one edge outside and the other inside.

Véxillary, having one large petal enclosing the others (Pea).

Plicate, the folding of gamopétalous flowers.

Supervolute, with folds turned obliquely in the same direction (Morning-glory).