Iris or Flag, Hardiness Zone 5-10 (Iris). Irises are perennial plants, growing from creeping rhizomes (rhizomatous Irises) or, in drier climates, from bulbs (bulbous Irises). They have long, erect flowering stems which may be simple or branched, solid or hollow, and flattened or have a circular cross-section. The rhizomatous species usually have 3–10 basal sword-shaped leaves growing in dense clumps. The bulbous species have cylindrical, basal leaves. Flag Iris or wild Iris includes blue flag which is found in boggy areas and swamps of the northeastern United States, and yellow flag which is native to Europe. These are types of beardless Iris. Blue flag Iris is ideal for pond or water gardens. Reaching heights up to 48 inches has long, narrow leaves, sometimes curved.
Water-crowfoot, Hardiness Zone 4-8 (Ranunculus Fluitans). This is a species of buttercup. It is a perennial and bushy in favorable conditions when it can grow up to 18ft in height. Submerged forms of these plants are generally flowerless but it can flower if the plant grows tall enough to emerge.
Bulrush, Hardiness Zone 4-8 (Scirpus Lacustris). Bulrush grows up to 11ft. tall, with stems .20 to .59 inches thick. Most of the leaves of are reduced to bladeless sheaths around the stem, but leaf blades up to 39 inches. long can be formed under water. The complete flower appears at the top of the stem, and comprises 3 to 10 branches, each of which is up to 3.9 in long and may be again divided into shorter branches. The flowers are in the form of spikelets, each of which is .24 to .59-inch-long by .12 to .20-inch wide.
Cattail, Hardiness Zone 3-10 (Typha Latifolia). Cattail is found as a native plant species in North and South America, Europe, Eurasia, and Africa. In Canada, broadleaf cattail occurs in all provinces and also in the Yukon and Northwest Territories, and in the United States, it is native to all states except Hawaii. It is considered a noxious weed in Hawaii and Australia. Cattail has been found in a variety of climates, including tropical, subtropical, southern and northern temperate, humid and dry conditions. It is found at elevations from sea level to 7,500 feet. Growing up to 10 feet high and ¾ to 1½ inch broad leaves, and will generally grow out in 2 to 3 feet of water depth
Arrowhead, Hardiness Zone 5-10 (Sagittaria Latifolia). Arrowhead is a variably sized from 6 to but not limited to 60 feet perennial growing in colonies that can cover large amounts of ground. The roots are white and thin, producing white tubers covered with a purplish skin. The leaves are extremely variable, from very thin at 1 to 2 cm to wedge shaped. Spongy and solid, the leaves have parallel venation meeting in the middle and the extremities. Male flowers are easily distinguished from female due to the dissimilarity between the 25 to 50 yellow stamens of the male and the sphere of green carpels of the female ones.