Introduction: Indus is a deciduous tree. There are only one genera and two species in this family. The two species are similar, only one leaf is hairy, and the other leaf sycamore is smooth. Wild species only grow in Sichuan Province, Hubei Province and surrounding areas. Indus has been listed as a national key protected wild plant. It is also a world-famous precious ornamental tree. It is often planted near the pool, by the stream, near the exhibition hall, and has the symbolic meaning of peace.

Basic information: Davidia involucrata, blue fruit tree family (Amaranthus); genus Indus; nickname: pear, pigeon tree, pigeon flower tree; plant kingdom; angiosperm; dicotyledon;

Morphological characteristics: deciduous trees, 15-20 meters high, 25 meters thin; chest height about 1 meter; bark dark gray or dark brown, often split into irregular thin slices and fall off. Young branches are cylindrical, the branches are purple-green, hairless, perennial branches dark brown or dark gray; winter buds conical, with 4-5 pairs of oval scales, often arranged in a tile-like arrangement. Leaves papery, alternate, stipules absent, often densely apically apate, broadly ovate or suborbicular, ca. 9-15 cm long, 7-12 cm wide, apically acute or short acutely acutely lanceolate Tip, base heart-shaped or deep-hearted, with triangular edges and pointed sharp serrated serrated teeth, bright green on the top, very sparsely villous at first, glabrous when aged, densely pale yellow or pale white The coarse hairs, the midribs and the 8-9 pairs of lateral veins are prominent above, and are convex below; the petiole is cylindrical, 4-5 cm long, 7 cm thin, and sparsely pubescent when young. The bisexual flower is the same as the male flower, and the male flower and the female flower or the bisexual flower form a nearly spherical flower head, about 2 cm in diameter, which is born at the top of the young branch. The bisexual flower is located at the top of the inflorescence, and the male flower surrounds it. Around, base 2-3 pieces of paper, oblong-ovate or obovate-ovate petal-like sepals, 7-15 cm long, sparsely 20 cm, 3-5 cm wide, sparsely 10 cm, initially Light green, followed by milky white, then turned brown and shedding. Male flowers without calyx and petals, with stamens 1-7, 6-8 mm long, filaments slender, glabrous, anthers elliptic, purple; female flowers or bisexual flowers with sublocate, 6-10, connate with receptacle, ovary The apex has degenerate perianth and short stamens. The style is thick and divided into 6-10 branches. The stigma is flattened outwards. Each ovule has 1 ovule and often hangs down. The fruit is a long oval round drupe, 3-4 cm long, 15-20 mm in diameter, purple-green with yellow spots, exocarp is very thin, mesocarp fleshy, endocarp bone with groove, seed 3-5; fruit The stem is thick and cylindrical. Flowering in April, fruiting in October.

Growth habits: Sycamores prefer to grow in moist evergreen broad-leaved deciduous broad-leaved mixed forests at altitudes of 1500-2200 m. Born in the air and dampness, the soil with deep neutral or slightly acidic humus grows poorly in dry and windy places, is not resistant to infertility, and is not resistant to drought. The seedlings grow slowly, like the dampness, and the adult trees tend to be happy.