On the difference between big-leaf cold orchid and thin-leaf cold orchid

First, correct the landlord's point of view. In fact, Lagerstroemia indica is often said, which is relative to Lagerstroemia indica! ! ! The following are simply distinguished from morphology, habits and distribution: Lagerstroemia indica (Lagerstroemia indica)-deciduous shrubs or small trees, up to 7 meters high; It can be cultivated all over the country; The leaves are 3-7 cm long; Flower diameter 3-4 cm; Calyx tube without longitudinal edge. Lagerstroemia speciosa (alias Lagerstroemia speciosa, Lagerstroemia speciosa)-evergreen tree, up to 20 meters high; Very cold-tolerant, more common in South China cultivation; Leaf length10-25 cm; Flower diameter 5-7.5 cm; Calyx tube has 12 longitudinal edges. 1 Lagerstroemia indica and 2 Lagerstroemia indica