Weinthal was born in Brisbane and spent his younger and early adult years in and around South Eastern Queensland where was to develop his initial interest in botany and native plant cultivation.
Weinthal worked as a conveyancer with the New South Wales Government Savings Bank whilst actively maintaining his botanical collection work, submitting specimen collections to herbariums throughout Australia and abroad over a number of decades.
[6] Bulbophyllum weinthalii was first formally described in 1933 by Richard Sanders Rogers and the description was published in Transactions and Proceedings of the Royal Society of South Australia from a specimen collected by Weinthal with the specific epithet (weinthalii) honouring his role as collector of the type specimen.
[7][8] There are two subspecies: Sarcochilus weinthalii was first formally described in 1904 by Frederick Manson Bailey and the description was published in the Queensland Agricultural Journal from a specimen collected near Toowoomba by Weinthal.
[11] The specific epithet (weinthalii) honours his initial collection of the type specimen at Main Range Toowoomba Queensland in 1903.
[20] 1940 Dendrobium Kingianum, D. Fairfaxii, D. delicatum, D. aemulum, and D. gracilicaule, all charming species of orchids collected by Mr. F. A. Weinthal in Australia.