ACANTHUS FAMILY ACANTHACEAE
The flowers are bilaterally symmetrical and closely resemble snapdragons. The corolla tube has upper and lower lips, the upper with 2 lobes and the lower with 3. The bracts are often showy. The opposite, simple leaves are smooth edged.
AMARANTH FAMILY AMARANTHACEAE
Weedy plants with inconspicuous flowers arranged in heads, spikes, or racemes, often with colored bracts. There are no petals. The leaves are simple and can be alternate or opposite.
AMARYLLIS (DAFFODIL) FAMILY AMARYLLIDACEAE
These bulbed perennials have narrow, grass-like, basal leaves.
The showy, radially symmetrical flowers are often lily-like, with 6 petals/sepals and a long, leafless flower stalk. (Differs from a lily in having the petals/sepals attached to the seed receptacle). There may also be a central "crown". The fruit is a capsule or berry.
Daffodils, jonquils, amaryllis and narcissus are in this family.
ARROWHEAD/WATER PLANTAIN FAMILY ALISMATACEAE
The radially symmetrical flowers are in whorls of 3 on leafless stalks, and have 3 sepals and 3 roundish petals. The long-stemmed basal leaves are often arrowhead-shaped. Found in swamps, streams and other wet or muddy areas. The family is a small one with only about 80 species.
ARUM/CALLA FAMILY ARACEAE
The flower arrangement is unique, with small flowers without sepals or petals crowded on a fleshy stem (spadix) partially enclosed by a floral leaf or bract (spathe). The long-stemmed leaves are large, and the fruit is usaully a berry or cluster of berries. Usually found in shady, moist places.
Cultivated examples include calla lily, dieffenbachia, philodendron and taro.