Characteristics
An evergreen tree. It is medium sized. It grows 10-20 m high. The leaf stalk is 1.5-2 cm long. The leaf blade is sword shaped. It is 7-18 cm long by 2-5 cm wide. It is papery to leathery. It is the same colour on both sides. The base is rounded. There are teeth on the edge towards the tip. The tip is heart shaped. There are 9-12 side veins on each side of the main vein. The female flowering stalk is produced on the ends of new small branches. The flowering stalk is 8-15 cm long with one flower per cup. The cup is round and 2.5-3.5 cm across. It splits into 3-5 parts. The outside is greyish brown and hairy when young. There are spine like bracts over the outside. The nut is cone shaped. It is 1.2-1.6 cm long by 1-1.3 cm wide.
| Life form |
perennial
|
| Growth form |
tree
|
| Growth support |
free-standing
|
| Foliage retention |
evergreen
|
| Sexuality |
monoecy
|
| Pollination |
-
|
| Spread |
-
|
| Mature width (meter) |
-
|
| Mature height (meter) |
10.0 - 20.0
|
| Root system |
-
|
| Rooting depth (meter) |
0.7
|
| Root diameter (meter) |
-
|
| Flower color |
-
|
| Blooming months |
-
|
| Fruit color |
-
|
| Fruiting months |
-
|
| Nitrogen fixer |
-
|
| Photosynthetic pathway |
c3
|
Environment
A tropical plant. It grows between 200-1500 m altitude in central Vietnam. In China it grows in mixed and broad leafed evergreen forest below 1500 m altitude.
| Light |
-
|
| Soil humidity |
-
|
| Soil texture |
-
|
| Soil acidity |
-
|
| Soil nutriment |
-
|
| Hardiness (USDA) |
-
|
Usage
The nuts are eaten raw or roasted. They contain 20% oil.
Cultivation
| Mode |
-
|
| Germination duration (days) |
-
|
| Germination temperacture (C°) |
-
|
| Germination luminosity |
-
|
| Germination treatment |
-
|
| Minimum temperature (C°) |
-
|
| Optimum temperature (C°) |
-
|
| Size |
-
|
| Vigor |
-
|
| Productivity |
-
|
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