Sihai network

Species of Tieshu: variety Daquan with attached figure

There are 17 known species of Tieshu, which are distributed in the East and southeast of Asia, Oceania, Madagascar and other tropical and subtropical regions. There are 8 kinds of Cycads in China, they are South China cycads, Hainan cycads, Yunnan cycads, Taiwan cycads, grate cycads, Sichuan cycads, fork leaf cycads, etc. Here is a brief introduction to the variety of iron trees.

The common species of Cycads in Sichuan 1. Cycads in South China

Cycas rumphii is also known as Cycas spinosa and Cycas Longwei. Cultivated in South China, native to Indonesia, northern Australia, Vietnam and other places, it is an evergreen tree. It is suitable for growing in a warm, dry and well ventilated place. Wang Dingyue, a scholar, thinks that C. rumphii is not distributed in the mainland of China, and its cultivation is rare. The so-called "South China Cycas" is a misidentification, and this one should be abandoned, and C. rumphii's Chinese Cycas spinosa should be restored.

Cycas rumphii

2. Cycas hainanensis

Hainan cycads, also known as spiny handle cycads. The pinnate leaves are about 1 m long, the leaflets are sparsely growing, and the leaf shape is small. The seeds are reddish brown when dried. Evergreen palm like woody plant. It is native to Hainan Island, China. It likes the climate environment of high temperature, high humidity and half shade, and likes the micro acid soil rich in humus. It is distributed in Guangdong, Hainan Island, Wanning and Haikou.

Cycas hainanensis

3. Cycas yunnanensis

Cycas siamensis, also known as Siamese Cycas. Its dry height can be up to 3 meters; the length of its feather leaves is 120-150 cm, and the petiole is about 1 / 3 of the length of its feather when it comes to the top of the trunk; the male cone-shaped is oval, and the female cone-shaped is flat oval; the seed egg-shaped is yellow brown; it is produced in the south of Yunnan, and it is also distributed in Myanmar, Thailand and Vietnam, which is a national three-level rare protected plant.

Cycas siamensis

4. Cycads in Taiwan

Cycads in Taiwan is an ancient remnant plant. At present, cycads only exist in some areas of Taiwan and Hainan in China, with a small number, slow growth and weak fecundity. In addition to the destruction of forests, habitat changes and excessive excavation, it has been in the situation of near extinction.

Taiwan Tieshu

5. Cycads grate

The trunk of Cycas crenata can be as high as 3 meters. The old trees often have branches. The leaflets are thick and about 6 to 8 mm wide. The edges are flat or slightly curled. The back is glabrous and the base is extended downward. There is a groove in the center of the frontal vein, and the leaflets at the base of the pinnate are needled in two rows of equal length. The leaves grow up, the feathers are thick and leathery, and the two sides are bright. It is an endangered species in China.

Cycas pectinata

6. Sichuan Cycads

Sichuan cycads is a kind of national protected plant, also known as Tieshu, which is one of cycads. Its characteristics are as follows: 1. Large pinnate leaves, not retrorse rolled; 2. Not obvious trunk, like shrub; 3. Spiny teeth on petiole; 4. Dark brown when seed is mature.

cycas szechuanensis

7. Cycas crenata

The pinnatifidae are bifurcated, so it is suitable to call it Cycads in Chinese. Because cycads is only distributed in a narrow range from Guangxi to Hanoi, Vietnam, and because of its unique leaf shape, cycads is an important material to study the phylogeny of cycads, and is classified as a national three class protected plant.

Cycas micholitzii

8. Brazilian iron tree

Brazilian wood is also known as xianglongxue tree, which is also known as Brazilian iron tree, Brazilian millennial tree and Phnom Penh xianglongxue tree. It is an evergreen tree of Liliaceae Longxue tree, with a height of more than 6 meters, pot planting height of 50 cm-150 cm and branches; its leaves are clustered on the top of the stem, curved and arched, bright green and shiny, with small flowers and no significant fragrance; it is slightly shade resistant, likes high temperature, and goes into dormancy and stops growing when it is lower than 13 ℃ It likes loose and well drained soil. It likes rotten leaf soil or peat soil when potting. It is often used for cutting propagation. The cutting temperature is required to be high, and it likes half shade and sufficient fertilizer.

Brazilian iron tree

9. South American Cycas

South American Iron trees are mostly single stem, with a stem length of 15-30cm, few branches, sometimes clumps, thick cylindrical shape, densely covered with dark brown leaf scars on the cylinder surface, and young sprouting rattan often grows at the base of the total stem of perennial; the leaves are mostly large even pinnate compound leaves, clumped on the top of the stem, 60-120cm long, hard, 15-20cm long petiole, sparsely hard spinules; pinnate leaflets 7-12 pairs, small The leaves are elliptic, with unequal sides, 2 / 3 of the whole at the base, dense and obtuse serrate at the upper part, blunt and acuminate at the top, curly at the edge, without midvein, 40 parallel veins with obvious protuberances can be seen at the back of the leaves; the male inflorescence is loose and spherical, 10-15cm long, and the female inflorescence is palmlike. Like warm, humid and sunny environment, cold and drought resistant, suitable for planting in ventilated places.

South American Cycas