PSC 2620: Woody Trees and Shrub | Course Home | Study Materials |
Crataegus laevigata - the leaf is 2 inches long and has 3, rarely 5, toothed-lobes. The margin is finely serrated. | Crataegus phaenopyrum - The leaves are 1-3 inches long and have 5 lobes. They have a more triangular shape than the leaf of laevigata, and the margin is more roughly serrated. |
Crataegus x lavallei - Unlike other species of Hawthorn, the leaves are not lobed, but are dark green and lanceolate in shape. The leaf has a finely serrated margin. |
Crataegus laevigata - The flowers are white, but most cultivars commercially available have a pink blossoms. They are 1/2 inch wide and form in corymbs. They appear in late spring. | Crataegus phaenopyrum - The flowers are white and bloom in the beginning of summer. They are very short lived, only 7-10 days. |
Crataegus x lavallei - The small white flowers form in corymbs that are 2-3 inches wide. |
Crataegus laevigata - The fruit consists of 1/2 inch red pome fruit. | Crataegus phaenopyrum - The fruit is bright red and persists through the winter. The fruit forms in large clusters. |
Crataegus x lavallei - The pome fruit is 3/4 inches in diameter and persist through winter. They are orange-red in color. |
Crataegus laevigata - The bark is gray in color and and has a rough texture that looks like it is exfoliating. | Crataegus phaenopyrum - The bark is gray-brown in color and roughly textured. |
Crataegus x lavallei - The bark is gray-brown and forms fissures and peels. |
Crataegus laevigata - The throns are located at the leaf node and on the ends of branches. They are smaller than the thorns of either Crataegus phaenopyrum or x lavallei. | Crataegus phaenopyrum - The thorns are 3 inches (or longer) and very stiff. They form in abundance throughout the canopy. |
Crataegus x lavallei - The thorns form in groups on the trunk and stems. They are about 2-3 inch long. |
Crataegus laevigata - The tree grows 15-20 feet high and has a dense and tangeled canopy. | Crataegus phaenopyrum - It grows 20-30 feet high and wide and has a rounded but irregular form. |
Crataegus x lavallei - The tree grows 20 feet high and wide and has a rounded form and very dense canopy. |