AY Honors/Cacti/Answer Key

1. Name the chief characteristics of a cactus.

Areoles - Flowers, branches, spines sprout from these- no other plant has this feature.

Spines - Perhaps the most familiar feature of cacti, spines can vary greatly in appearance, shape, size, and color. Spines are not thorns.

Flowers - Flowers are not unique to cacti, but cacti flowers are unique. Cacti flowers are typically quite spectacular and very complex. Unfortunately this field mark is only helpful, of course, if the plant happens to be blooming.

Leaves - Most cacti do not have leaves, however, some do. Pay special attention to the presence or absence of leaves.

Origin - All cacti are native to the America's and surrounding islands. With one exception - Rhipsalis baccifera. Although, world wide cultivation has made this less helpful for identification.

2. Name three uses of cacti.

Cacti are used for:

1. Decorating - as houseplants, in dry gardens, or, even as a fence.

2. Edible Fruit Producing - such as Prickly Pear, Hylocereus, Dragon fruit.

3. Psychoactive uses - the Peyote, Lophophora williamsii, is a well-known psychoactive agent used by Native Americans in southwestern United States.

4. Host for bugs - the Opuntia is also used as a host for cochineal bugs for the Cochineal dye industry.