When does the elm blossom?
Elm blooms in early spring, and the time of entering spring is different in the north and south, and it is gradually late in the south, usually from mid-March to early April.
Elm is a deciduous tree, with a height of 25m, DBH 1 m, and grows into a shrub on arid and barren land. The bark of young trees is smooth, grayish brown or light gray, and the bark of big trees is dark gray, irregular, deep and rough; Branchlets are glabrous or hairy, yellowish gray, brownish gray or gray, sparsely brownish yellow or yellow, with scattered lenticels, no expanded cork layer, and raised cork wings; Winter buds are nearly spherical or ovoid, the back of bud scales is hairless, and the edge of inner bud scales is white villous.
The leaves are elliptic-ovate, oblong-ovate, elliptic-lanceolate or ovate-lanceolate, 2-8 cm long and 1.2-3.5 cm wide. The top is tapered or long-tapered, the base is inclined or nearly symmetrical, one side is wedge-shaped to round, and the other side is round to semi-heart-shaped. The leaves are smooth and hairless, and the back of the leaves is pubescent when they are young, and then they become hairless or have tufted hairs in the axils of some veins, with heavy edges.
Flowers open leaves first, and the branches and leaves are axillary last year. Samara is nearly round, sparsely obovate, round, long 1.2-2 cm, and hairless except for the top-cut stigma.
The stone part is located in the middle of Samara, and the upper end is not near or near the gap. Same color as fruit wings before and after ripening. It's light green at first, then white and yellow. Persistent perianth glabrous, 4-lobed, lobular margin hairy. The fruit stalk is shorter than the perianth, 1-2 mm long, and is (or sparsely) pubescent. The flowering and fruiting period is from March to June (later in Northeast China).
Extended reading:
morphological character
White bark of elm (the theory and classic of medicinal properties of original elm bark)
The source is the phloem of elm bark or root bark.
Elm (Tao Hongjing), also known as: powder (The Book of Songs), white elm (Biography of Mao Poetry), white elm (Erya), zero elm (Classic), white elm (Erya), elm (a herb for famine relief), and diamond sky.
Deciduous trees, up to 9 meters high.
Bark is dark gray-brown, rough and longitudinally cracked; Branchlets are soft, hairy and grayish yellow.
Simple leaves alternate; Obovate, oval or elliptic-lanceolate, 2-8 cm long and 2-2.5 cm wide.
The apex is acute or tapering, the base is round or wedge-shaped, the edge is usually single-serrated, the upper part is dark green and hairless, the lower part is pubescent when young, and only the axils have white hair when old; Petiole is 2 ~ 8 mm long and hairy; Stipules lanceolate, long 1 cm, hairy.
Flowers have open leaves, clusters and short stems; Calyx 4 ~ 5-lobed; Stamens 4 ~ 5, anthers purple; Ovary flat, style 2.
Samara obovate or suborbicular, smooth, with notched apex.
The seed is located in the center and meets the gap, and its length is 1 ~ 1.5 cm.
The flowering period is from March to April.
The fruiting period is from April to June.
It is distributed in most areas of China.
The leaves (elm leaves), flowers (elm flowers), fruits or seeds (elm kernels) of this plant are also used as medicine, and each has its own articles in detail.
Collect old branches cut in spr or August-September, immediately peeling off endothelium, and drying in that sun.
Chemical components include β-sitosterol, phytosterol, stigmasterol, tannin, gum and fatty oil.
Sex is sweet and plain.
1 classic: sweet and plain.
2 "No recording": non-toxic.
③ Brief edition of medical forest: sweet and cold.
Meridian tropism (1) Outline: Sun of Hand and Foot and Yangming Meridian of Hand.
2 "Materia Medica Seeking Truth": into the stomach, large intestine.
growing environment
Born on river banks, ridges and roadsides; There is also growth in the foothills and sand.