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Crataegus pennsylvanica, known as the Pennsylvania thorn, [2] is a species of hawthorn native to Delaware, New York, North Carolina, Ontario, Ohio, and Pennsylvania, [2] that grows to about 8 m in height. [2] The mature trees have few thorns. [2]
Each cluster is a raceme 3–7 centimeters long with many tiny greenish-yellow to greenish-white flowers. [7] [11] The trees are polygamous-dioecious: many trees have only pollen producing flowers or seed producing flowers (strictly dioecious), but some will have both types of flowers in separate clusters, though usually one type will ...
Crataegus (/ k r ə ˈ t iː ɡ ə s /), [2] commonly called hawthorn, quickthorn, [3] thornapple, [4] May-tree, [5] whitethorn, [5] Mayflower or hawberry, is a genus of several hundred species of shrubs and trees in the family Rosaceae, [6] native to temperate regions of the Northern Hemisphere in Europe, Asia, North Africa and North America.
This page alphabetically lists some known plant species occurring in the US state of Pennsylvania. Currently about 2,100 native and 1,300 non-native plant species are known in Pennsylvania. [1] According Pennsylvania Department of Conservation and Natural Resources, the known species make up 37% of Pennsylvania's total wild plant flora.
The flowers are white and have a scent generally considered unpleasant. The fruits are small pomes that vary in colour, usually a shade of red. [3] Most wild varieties [specify] of the tree are heavily armed in sharp thorns several centimeters long. [citation needed] A Cockspur Thorn tree in flower, Oxfordshire UK, 5th May 2022.
Like its common names suggest, Smilax rotundifolia is a green vine with thorns. It is a crawling vine that can tangle itself within other plants and climb with small tendrils. [7] The plant can grow up to 20 feet long by climbing objects and vegetation. If there is nothing for it to climb upon it will grow along the ground.
Notably, the plant is armed with spines, prickles, or thorns. The dimensions of the leaf blade range from 110 to 220 mm in both length and width. Each leaf possesses a leaf stalk. The fruit, it is of a fleshy nature. The bark of the mature plant is thin and smooth, while the twigs exhibit a winter coloration in shades of brown or gray.
Altogether, ENTS has confirmed four trees to heights of 51 m (167 ft) or more by climb and tape drop. In the Northeast, the tallest accurately measured tree is 44 m (144 ft). This tree, named the Seneca hemlock, grows in Cook Forest State Park, PA. Above 43°N latitude, the maximum height of the species is less, under 39 m (128 ft).