Charak Samhita
(तथा मूषिकपर्णी चाप्युपचित्रा च शम्बरीप्रत्यक्श्रेणी सुतश्रेणी दन्ती र(च)ण्डा च कीर्तिता ) तयोर्मूलानि सङ्गृह्य स्थिराणि बहलानि च। हस्तिदन्तप्रकाराणि श्यावताम्राणि बुद्धिमान्॥४॥
(The names like mushkaparni, upachitra, sambari, pratyaksreni, sutasreni, danti and chanda are also considered for dravanti.) [Method of collection] The roots of these plants which are strong, woody, mature which appear like elephant’s tusk, with thick root bark, black (danti) and coppery (dravanti) color should be collected by wise physician.
english translation