Name classification: Bougainvillea glabra. Common names: Baojin, Liandujuan, Triangle Flower, Bougainvillea, Small-leaf Bougainvillea, Purple Triangle, Purple Azalea. It is a vine-like shrub. The stem is thick, with thorns arising in the axils. Leaves are papery, ovate or ovate-lanceolate, with a pointed or gradually tapering apex, and a rounded or broadly cuneate base. The flower is located within 3 bracts at the apex of the branch, with 1 flower on each bract ; Bracts are leaf-like, purple or red, oblong or oval in shape. The perianth tube is pale green ; Stamens 6-8, stylus lateral, linear ; The disc is ring-shaped with a torn upper part. Flowering occurs in winter and spring (in Guangzhou, Hainan, Kunming); in greenhouses in the north, it blooms from March to July. Native to Brazil, it has been introduced and cultivated throughout the north and south. Flowers are used in medicine. Morphological characteristics: Plant: Vining shrub. Stem: The stem is thick, with branches that hang downward; it is hairless or sparsely covered with soft hairs ; Spines are 0.5–1.5 cm long and axillary. Leaves: Leafy, papery, ovate or ovate-lanceolate, 5–13 cm long, with a pointed or gradually tapering apex and a rounded or broadly wedge-shaped base; the upper surface is hairless, while the lower surface is covered with fine hairs ; The petiole is 1 centimeter long. Flower: The flower is located within 3 bracts at the apex of the branch; the pedicel is attached to the midrib of the bract, with 1 flower growing on each bract ; Bracts are leaf-like, purple or red, oblong or oval in shape. Flowering and fruiting period: Flowering occurs in winter and spring (in Guangzhou, Hainan, Kunming); in greenhouses in the north, flowering takes place from March to July. According to historical records, it is a vine-like shrub. Stem is thick; branches hang downward; hairless or sparsely pubescent ; Spines are axillary, 5-15 mm long. The leaves are papery, oval or ovate-lanceolate, 5–13 cm long and 3–6 cm wide, with a acute or gradually pointed apex and a rounded or broadly cuneate base; the upper surface is hairless, while the lower surface is covered with fine hairs ; The petiole is 1 centimeter long. The flower is located within 3 bracts at the apex of the branch; the pedicel is attached to the midrib of the bract, with one flower growing on each bract ; Bracts are leaf-like, purple or magenta, oblong or elliptical, 2.5–3.5 cm long and about 2 cm wide, papery in texture ; The perianth tube is about 2 cm long, pale green, sparsely hairy, ridged, and slightly 5-lobed at the apex ; Stamens 6-8 ; The style is lateral, linear, with its edge expanded into a lamellate shape; the stigma is pointed ; The base of the disc is fused into a ring shape, while the upper part is torn. The flowering period is in winter and spring (in Guangzhou, Hainan, and Kunming); in greenhouses in the north, it blooms from March to July.