When do plane trees usually lose their leaves? Is French sycamore really a plane tree?

Sycamore trees are also known as Qingtong and Tongma. In the sycamore family, there are 15 classifications of sycamore. Chinese branches include sycamore, Hainan and Yunnan, which usually lose their leaves in late autumn, about October in the north and November in the south. In fact, the "French sycamore" tree that we are often familiar with does not belong to the sycamore family, but belongs to the rose family. The scientific name of "French sycamore" is Platanus przewalskii, also known as Platanus przewalskii and Kumaroshi, known as "the king of street trees". Another commonly heard of "paulownia" does not belong to the sycamore family, but belongs to Scrophulariaceae and paulownia genus.

1. Sycamore tree

Shape features: tall and burly, tree trunks are jointless, rising upward, holding emerald-like green umbrellas, imposing. The bark is smooth and green, the leaves are thick, from the branch to the branch, it is lush, elegant and clean. "A green jade stand, a thousand leaves green cloud committee", these two poems, the Indus green leaves dry, Tongyin whirling scenery written incisively and vividly.

Growth cycle: sycamore generally germinated 4-5 weeks after sowing, mature 5-6 years, flowering from June to July, and deciduous period from October to November.

two。 French sycamore (three-ball Suzuki)

Features: the crown is broad bell-shaped; the dry skin is grayish brown to grayish white, flaking off. Young branches and young leaves densely brown stellate hairs. Leaves palmately 5-7-lobed, deeply divided to middle, lobes growing at broad, leaf base broadly cuneate or truncate, leaf margin dentate, palmately veined; stipules rounded. Inflorescences capitate, yellowish green. Most nuts are globose in whole leaves, 3-6 balls in a string, persistent style long, hairy, and fruit stalk long and drooping.

Growth cycle: the flowering period is from April to May and from June to July, and the fallen leaves generally vary from region to region. In North China, the leaves usually fall from November to December every year, but a small number of leaves will survive the winter on the tree until around spring.

3. Paulownia

Appearance features: the bark is gray, grayish brown or grayish black, smooth when young and longitudinally split when old. False bifurcations. Leaves simple, opposite, large, ovate, entire or lobed, long stipitate, tomentose on stalk. Flowers large, lavender or white, terminal panicle, composed of many Cymes. Calyx campanulate or discoid, hypertrophic, 5-parted, lobes unequal. Corolla campanulate or funnel-shaped, upper lip 2-lobed, revolute, lower lip 3-lobed, straight or slightly revolute; stamens 4, 2 long and 2 short, inserted at the simple base of Corolla; pistil 1, style slender. Capsule ovate or elliptic, dorsal suture dehiscent when ripe. Most of the seeds are oblong, small and light, with striped wings on both sides.

Growth cycle: paulownia grows rapidly and can be grown at the age of 7-8 years. The roots were buried from mid-late February to the end of March, flowered from March to April, and deciduous leaves from October to November.