Title: Heartleaf
Content: Hexastylis, a genus of plants native to North America ; Macaranga tanarius, a species native to southeast Asia and Australia Heartleaf or heart leaf is a common name for several plants and may refer to: 
Title: Atriplex cordulata
Content:  Heart-leaf orache is an annual herb producing one or more erect stems to heights between 10 and 50 centimeters. The branches are scaly gray and have woolly fibers toward the ends. The gray scaly leaves are no bigger than 1.5 centimeters long and most have heart-shaped bases. The plant has male and female inflorescences which are small hard clusters of flowers. The reddish brown seeds are about 2 millimeters wide.
Title: Oxylobium cordifolium
Content:  Oxylobium cordifolium, commonly known as the heart-leaved shaggy pea, is a species of flowering plant in the family Fabaceae and is endemic to New South Wales. It is a small, prostrate shrub with long, wiry branches, heart-shaped leaves and orange-red flowers.
Title: Ulmus americana 'Littleford'
Content:  The tree is narrowly vase-shaped with larger and heavier leaves.
Title: Keckiella cordifolia
Content:  Keckiella cordifolia (formerly Penstemon cordifolius) is a species of flowering shrub in the plantain family known by the common name heartleaf keckiella. It is native to the coast and coastal mountains of southern California and northern Baja California, and it is a resident of chaparral and coastal woodland plant communities. This is a spreading shrub reaching maximum heights in excess of two meters. Its shiny green leaves are oval to heart-shaped, pointed, and edged with small teeth. They are 2 to 6 centimeters long and arranged oppositely on the branches. The shrub produces glandular, hairy inflorescences of many flowers each. The flower is somewhat tubular with a wide open mouth. It is fuzzy on the external surface and any shade of pale orange to deep scarlet. It is up to 3 centimeters long and 4 wide at the mouth, which has three flat lower lobes and two joined upper lobes. Inside the mouth are long filamentous stamens and a flat, hairy, yellow sterile stamen called a staminode.
Title: Tinospora cordifolia
Content:  It is a large, deciduous, extensively-spreading, climbing shrub with several elongated twining branches. Leaves are simple, alternate, and exstipulate with long petioles up to 15 cm long which are roundish and pulvinate, both at the base and apex with the basal one longer and twisted partially and half way around. It gets its name heart-leaved moonseed by its heart-shaped leaves and its reddish fruit. Lamina are broadly ovate or ovate cordate, 10–20 cm long or 8-15 cm broad, seven nerved and deeply cordate at base, membranous, pubescent above, whitish tomentose with a prominent reticulum beneath. Flowers are unisexual, small on separate plants and appearing when the plant is leafless, greenish-yellow on axillary and terminal racemes. Male flowers are clustered, but female flowers are usually solitary. It has six sepals in two series of three each. The outer ones are smaller than the inner. It has six petals which are smaller than sepals, obovate, and membranous. Fruits aggregate in clusters of one to three. They are avoid smooth drupelets on thick stalks with sub terminal style scars, scarlet or orange colored.
Title: Ulmus × hollandica 'Commelin'
Content:  A fast-growing, attractively-shaped tree distinguished by its small pale-green leaves with bright venation and a slight blue-grey color distinction from ‘Vegeta’. The leaf shape is typically elliptic, with a short acuminate apex. The leaves are sparsely arranged and fall significantly later than those of 'Vegeta'.
Title: Asclepias cordifolia
Content:  Heart-leaf milkweed is a perennial that grows to a height of 0.3 to 0.6 m, with dark red-purple flowers whose hoods are slightly elevated above the base of the corolla. The flower structure is unusual—it has five stamens fused into a column, with five circular attachments called 'hoods', and an anther head surrounding the large stigma at the flower's center. The fruit (photo at left) is a follicle with many flat seeds that have silky hairs which disperse easily in the wind. The large opposite leaves are cordate, or heart-shaped. The plant grows in open or shaded woodland, often on rocky slopes and in mixed coniferous forest. The milkweeds are named for the milky sap which exudes from the plant's stem. It blooms from May to July.
Title: Cercis occidentalis
Content:  Cercis occidentalis has thin, shiny brown branches that bear shiny heart-shaped leaves which are light green early in the season and darken as they age. Leaves on plants at higher elevation may turn gold or red as the weather cools. The showy flowers are bright pink or magenta, and they grow in clusters all over the shrub, making the plant very colorful and noticeable in the landscape. The shrub bears 3-inch-long brown legume pods which are very thin and dry.
Title: Ulmus 'Cathedral'
Content:  The tree is distinguished by its weeping form and large elliptic leaves, < 14 cm long by < 8 cm broad, almost the same size and shape of those of its female parent, the Japanese Elm, spinach green when mature, turning yellow and orange in autumn. 

Question: what kind of trees have heart shaped leaves?
Answer: Linden.
Eastern Redbud.
Catalpa.