please help me identify this plant. an old lady is selling this as a medicinal herb in the province of bulacan in the philippines. she said that this is called serpentina. but when i searched online, i only get the result "Rauvolfia serpentina (L.) Benth." which doesn't look the same as what she has, esp. the buds. i took photos of the plant yesterday and today. i can't wait for the buds to bloom, thus the photos.