Brief introduction of Gesneriaceae
There are about 140 species of Aesculus in Gesneriaceae, distributed in tropical and subtropical Asia. There are 34 species in China, mainly distributed in the south and southwest, and some of them are for garden viewing. Woody plants, often climbing on other trees; Leaves opposite or 3-4 whorls, leathery or fleshy; Flowers are beautiful, solitary or clustered, axillary or terminal; Calyx tubular, eaves 5-lobed; Corolla bright red, elongated, tube slightly curved, eaves oblique, 2-lipped; Stamens 4, usually prominent; Disk annular, slightly 5-lobed; Ovary is superior; Capsule long linear, 2-valved; Seeds have long hair.