The first is the difference between their stems. The stem of the first plant is stout, usually in the shape of a rod or a spindle, growing at about 25 to 40 cm and shrinking to a smaller cylinder at the bottom. The stem of the second plant is usually cylindrical and unbranched, with a length of 12 to 46 cm. This difference is not easy to observe.
The second difference is about their petals. The petals of the former are nearly round, about 1.5 to 2 cm long and about 1.1 to 1.5 cm wide. The petals of the latter are smaller, about 1.4cm long and 1.2cm wide, slightly different. There is also the lip, the first is golden yellow, showing a round diamond, and the second is a semicircular triangle.
Another is the obvious color difference. The first kind of sepals and petals are light yellow, while the second kind of sepals and petals are white. We can see this in the picture. However, there is another color difference that is hard to see, that is, the pistil column. The first color is orange, and the second is light yellow, but their length is about the same.
The two kinds of plants are distributed in the same countries, but the altitude is not small difference. The first species is usually found in forests ranging from 420 meters to one kilometer above sea level, while the second species is higher in the range of 1100 to 1800 meters. That is to say, if you go climbing, you may meet the first plant first, and then you may meet the second plant after climbing, isn't it interesting?
