Equilateral flower arrangements display flowers in a triangular shape with the tip as the smallest point and all sides an equal length. This allows the arrangement to be viewed from all sides as a symmetrical bouquet. Flowers appropriate for this type of arrangement range from exotic orchids to common garden varieties.
A tall growing flower resembling a purple snapdragon, African boxwood is an appropriate central plant in an equilateral flower arrangement. An evergreen shrub, the foliage provides a splash of deep green color to the bouquet, and the vibrant royal purple blossoms reach the tip of each spike-like branch in eye-catching clusters. Anchor one or two African boxwood spikes into a foam block in the exact center of the base of a vase or box. Protruding from the middle of the bouquet, the spikes provide a focal point around which other flowers can create even sides at the base of the arrangement.
Also known as the cornflower, bachelor's buttons provide equilateral arrangements with flowers that compete in height with that of the African boxwood. The flowers vary in color among hybrid varieties from white and yellow to pink and purple, though indigo blue naturally occurs in the blossoms. Bachelor's buttons make eye-catching additions to a triangular arrangement when the stems are cut down to be at a lower level than the central flower of the arrangement.
Love-lies-bleeding, or tassle flower, makes an attractive base for an equilateral flower arrangement. The long, spike-like flowers, much like African boxwood and similar varieties, can be cut down and arranged in a circular design at the bottom of the arrangement. The blossoms cluster around the entire stalk of the plant, reaching the tip, and hang delicately over the edges of plant vases and box arrangements.
Baby's breath, or gyp, is popular in floral arrangements and ornamental bouquets. The flowers add fluff and filler to equilateral bouquets to create a smoother design from tip to base. Place several bundles of baby's breath in a variety of hues around the base of the central plant. Allow the baby's breath to fall naturally in the arrangement, as the provided gaps provide places to add accent flowers.
Accent flowers work as after-thoughts in a flower arrangement. They fill a variety of spots from the tip to the base, especially in the gaps of filler plants like baby's breath and phlox. Flowers that make attractive accent flowers include Gerber daisies of any color, black-eyed Susans, dandelions and small lilies.