Crataegus, commonly called hawthorn, quickthorn, thornapple, May-tree, whitethorn, Mayflower or hawberry, is a genus of several hundred species of shrubs and trees in the family Rosaceae, native to temperate regions of the Northern Hemisphere in Europe, Asia, North Africa and North America. The name "hawthorn" was originally applied to the species native to northern Europe, especially the common hawthorn C. monogyna, and the unmodified name is often so used in Britain and Ireland. The name is now also applied to the entire genus and to the related Asian genus Rhaphiolepis.
Crataegus monogyna, known as common hawthorn, one-seed hawthorn, or single-seeded hawthorn, is a species of flowering plant in the rose family Rosaceae. It is native to Europe, northwestern Africa, and Western Asia, but has been introduced in many other parts of the world.
Crataegus douglasii is a North American species of hawthorn known by the common names black hawthorn and Douglas' thornapple. It is most abundant in the Pacific Northwest.
Crataegus azarolus is a species of hawthorn known by the common names azarole, azerole and Mediterranean medlar. It is native to the Mediterranean Basin and is a common plant there, growing on sites comparable to those the European common hawthorn grows on. In the Arab countries it is the most common hawthorn species. When growing in the wild, the azerole bears plentiful crops of haw fruits, which are similar to the haws of the European common hawthorn, but more plump.
Crataegus brachyacantha is one of the "black-fruited" species of hawthorn, but it is only very distantly related to the other black-fruited species such as C. douglasii or C. nigra. The common names blueberry haw and blueberry hawthorn refer to the appearance of the fruit, which are almost blue, and does not refer to their taste. The species is rarely cultivated but has ornamental leaves, flowers, and foliage. It is native to Louisiana, and also occurs just across the border of neighbouring states.
Crataegus chrysocarpa is a species of hawthorn that is native to much of the continental United States and Canada. Common names fireberry hawthorn and goldenberry hawthorn, as well as the scientific name all refer to the colour of the unripe fruit, although the mature fruit is red and in var. vernonensis is "deep claret-colored … nearly black when over-ripe".
Crataegus coccinioides is a species of hawthorn known by the common names Kansas hawthorn and large-flowered cockspurthorn. Crataegus coccinioides is native from Kansas, to New England, and the southernmost parts of Ontario and Quebec. It has large flowers and leaves and fruit that appear pinkish until polished to reveal the red colour underneath the wax bloom. Crataegus coccinioides is a synonym of Crataegus dilatata.
Crataegus crus-galli is a species of hawthorn known by the common names cockspur hawthorn and cockspur thorn. It is native to eastern North America from Ontario to Texas to Florida, and it is widely used in horticulture. It is thought to be the parent, along with Crataegus succulenta, of the tetraploid species Crataegus persimilis.
Crataegus erythropoda is a hawthorn native to the southern Rocky Mountains in the United States. The leaves are conspicuously shiny above and fruit ("haws") are dark purplish red. It is seldom cultivated, but at one time was listed in the nursery trade under the common name "Chocolate Haw". It is closely related to C. rivularis which has fruit that are fully black when ripe.
Crataegus intricata is a species of hawthorn known by the common names Copenhagen hawthorn, Lange's thorn and thicket hawthorn. It is native to eastern Canada and the eastern United States. Its fruit are brown to red.
Crataegus macrosperma, the bigfruit hawthorn is a species of hawthorn native to most of the eastern United States and adjacent Canada, though uncommon at lower altitudes in the south. It is sometimes misidentified as C. flabellata. It is one of the earliest hawthorns to bloom in spring.
Crataegus marshallii is a species of hawthorn known by the common name parsley hawthorn. It is native to the southeastern United States.
Crataegus spathulata is a species of hawthorn known by the common name littlehip hawthorn. It is native to the southeastern United States. It has very attractive small delicate leaves with a bluish appearance, pretty flowers and small orange to red fruit.
Crataegus submollis, known as the northern downy hawthorn, northern red haw, Quebec hawthorn, or hairy cockspurthorn, is a species of hawthorn that grows to about 7 m in height and typically carries large crops of red fruit.
Crataegus succulenta is a species of hawthorn known by the common names fleshy hawthorn, succulent hawthorn, and round-fruited cockspurthorn. It is "the most wide-ranging hawthorn in North America", native to much of southern Canada, and the United States as far south as Arizona, New Mexico, Kansas, Missouri, North Carolina, and Tennessee. In this wide area there are many variant forms that have received species names, but can also be considered as synonyms. It is thought to be the parent, along with Crataegus crus-galli, of the tetraploid species Crataegus persimilis.
Crataegus uniflora is a species of hawthorn known by the common name one-flowered hawthorn, or dwarf hawthorn. It is native to parts of the southeastern United States. The plant is usually a small bush, but some forms can be a few meters tall. The flowers occur singly or in small clusters. The fruit are hairy and yellow to reddish in colour.
Crataegus viridis, the green hawthorn or southern thorn, is a species of hawthorn that is native to the southeastern United States. The tree tends to grow to be 5–15 meters tall. Forms vary considerably, and many desirable ornamental forms could be selected from the wild. The cultivar 'Winter King' is a well-known selection.
Crataegus mexicana is a species of hawthorn known by the common names tejocote, manzanita, tejocotera and Mexican hawthorn. It is native to the mountains of Mexico and parts of Guatemala, and has been introduced in the Andes. The fruit of this species is one of the most useful among hawthorns.
Crataegus songarica is an Asian species of hawthorn with black fruit that is sometimes used medicinally. It is closely related to Crataegus ambigua, a species that has red fruit.
Crataegus brainerdii is a species of flowering plant in the rose family known by the common name Brainerd's hawthorn. It is named for Ezra Brainerd (1844–1924), a renowned botanist and former president of Middlebury College, in Vermont.
Flowers of a white-anthered form
Fruit colour varies
