Perbandingan farmakognostik dari daun sirih hijau (Piper betle L) dan sirih merah (Piper cf. crocatum Ruiz & Pav.) = Pharmacognostical comparison of betel leaf (Piper betle L.) and red betel leaf (Piper cf. crocatum Ruiz & Pav (Fakultas Farmasi Universitas Indonesia, 2013)