This variety of cockspurhawthorn has thornless stems. It displays beautiful white flowers in spring and persistent fruit in fall and winter. Family (English) Rose. About ThornlessCockspurHawthorns. Anyone having a close relationship with a cockspurhawthorn ( Crataegus crus-galli ) probably has scratches to show for it. ThornlessCockspurHawthorn in late spring with a full canopy of dark green leaves, with branches covered in small white flowers. Ornamental Features. ThornlessCockspurHawthorn is covered in stunning clusters of white flowers held atop the branches in mid spring. ThornlessCockspurHawthorn is a deciduous tree with a stunning habit of growth which features almost oriental horizontally-tiered branches. Learn about the ThornlessCockspurHawthorn including when and why it was planted, how to identify it, and where to find it on campus. Thornlesscockspurhawthorn performs well throughout Colorado Springs. There are two planted at the Xeriscape Demonstration Garden that have proven to be trouble-free trees.They are... Leaf shape. ThornlessCockspurHawthornThornlessCockspurHawthorn – leathery, serrated, unlobed, spoon-shaped, borne on short petioles. ThornlessCockspurHawthorn shrub form is a small graceful tree with dark green glossy rust-free foliage. The white flowers appear in clusters during late May or early June, followed by... ThornlessCockspurHawthorn has no major insect problems and has resistance to rust diseases. The bark is exfoliates in thin gray strips, and provides winter interest. Thornlesscockspurhawthorns are covered in white flowers in late spring and have orange fruits in fall that persist well into winter. Fall leaf color is bright gold. Although this attractive thornless tree prefers moist conditions, it is also drought tolerant. Height: 15 to 20 Feet Spread: 15 to 20 Feet Shape: Roun. Crataegus crus-galli var. Inermis -ThornlessCockspurHawthorn - is a small, ornamental tree is native to eastern North America and widely used in horticulture. ThornlessCockspurHawthorn. Thornlesscockspurhawthorn has all the attractive features of the species but without the hazardous thorns.