绿色灯塔建筑外形是圆柱形的，所以有人给它起了外号叫“日晷”，其立面百叶可以调节，光照随着太阳移动围绕着建筑旋转而进入。
Green lighthouse building shape is cylindrical, so some people give it nicknamed "sundial", its facade shutter can be adjusted, the light as the sun moves around the building rotates into the.
叶互生，倒披针形，钝，无柄，半圆柱形；花序简单，直立，几乎无花序叶，5–12（-15）厘米高。
Leaves alternate, oblanceolate, obtuse, sessile, semiterete; flowering branches simple, erect, sparsely leafy, 5 – 12 (- 15) cm.
根茎短，粗状，圆柱形，被多数覆瓦状排列的鳞片状的叶。
The rhizome is short, thick shape, cylinder, by most imbricate arrangement scaled leaf.
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