Plants without flowers are called non-flowering plants, or gymnosperm.While they do produce seeds, the seed is not enclosed in a flower (and eventually a fruit) the way seeds are in flowering plants.
Non-flowering plants are very common, and include conifers (evergreens), cycads, and ginkgo. Popular types of conifers include fir and pine trees. These trees are characterized by sharp needles and produce cones that hold the seeds. (See picture: pine cones and needles)
Cycads are tropical plants with compound leaves and a sturdy
trunk. Ginkgo trees are one of the oldest kinds of trees known to
exist. They are usually very tall and have unique fan-shaped leaves
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