Pollen - City

Species - Poplar / Cottonwood

Poplar / Cottonwood

Winter - Spring
The genus has great genetic diversity and can grow from 15 to 50 m (49-164 feet) in height, with stems up to 2.5 m (8 feet 2 inches) in diameter. The bark of young trees is smooth, white to green or dark gray and often with visible lenses; in older trees it remains slippery in some species, in others it can be rough and deep. The branches are strong, with (unlike related whales) the terminal button present. The leaves are spirally arranged and vary in shape from triangular to round or (rarely) lobes and have a long petiole; in the species of Populus and Aigeiros, the petioles flatten out later, so the breeze quickly causes the leaves to vibrate, causing the entire stem to "sparkle" when viewed in the air. The size of the leaves varies considerably even on a single tree, usually with small leaves on the side shoots and very large leaves on the fast-growing lead branches. In autumn, the leaves usually turn bright golden to yellow before they fall off. Poplar seeds are easily scattered in the wind by beautiful feathers around them. The flowers are mostly dioecious (rarely monocotyledonous) and appear on the leaves in early spring. They are worn by tall, drooping, sessile or stalked kittens made from buds formed in the axils of the leaves of the previous year. Each flower is placed on a bowl-shaped disk located at the bottom of a bowl attached to the catkins spindle. The scales are ovate, lobed and fringed, membranes, hairs or smooth and usually cadesly. The male flowers have no calyx or crown and consist of a group of four to 60 stems inserted into a disc; fibers short and light yellow; anthers elongated, purple or red, intro and two-celled; the cells are opened longitudinally. The female flower also has no calyx or crown and consists of a single-celled ovary that sits on a cup-shaped disc. The style is short, with two to four stigmas, distinctive lobes and many eggs. Air pollination, in which female kittens rise significantly between pollination and adulthood. The fruit is a capsule with two to four lobes, green to reddish-brown, ripe in mid-summer, with several minutes of light brown seeds surrounded by tufts at the top, soft, white hairs that help blow air.
Read more about Poplar / Cottonwood at Wikipedia:
Poplar / Cottonwood
Image from Wikipedia