... Aim of study 2 Figure 1: Xuân hoa nhọn, P. acuminatissimum (Miq.) Kuntze. Figure 2: Xuân hoa lá -hoa, P. bracteatum Imlay. Figure 3: Xuân hoa đỏ, P. carruthersii (Seem.) Guill. ... review & Aim of study 4 1.1.1.2. P. bracteatum Imlay.[1] Vietnamese name: Xuân hoa lá -hoa, Hoàn ngọc đỏ, Hồng ngọc (figure 2). Herb, 50-60 cm tall. Stems quadrangular and ciliate ... carruthersii (Seem.) Guill. var. atropurpureum (Bull.) Fosb.[1],[2],[4] Vietnamese name: Xuân hoa đỏ, Ô rô đỏ, Nhớt tím (figure 3). Shrub, 1-2 m tall. Leaves, elliptic-ovate, smooth, violet-red,...