David Lyall (1817–1895) MD, RN, FLS, was a Scottish botanist who explored Antarctica, New Zealand, the Arctic and North America and was a lifelong friend of Sir Joseph Hooker.
He graduated in medicine from Aberdeen, having previously been admitted a Licentiate of the Royal College of Surgeons of Edinburgh.
Lyall entered the Royal Navy in 1839 and was immediately appointed, on 6 June, as assistant surgeon on HMS Terror, under Captain Francis Crozier (1796–1848), one of the two ships forming Sir James Clark Ross's Expedition to the Antarctic.
The ships were the first to penetrate the Antarctic pack ice and to confirm the existence of the great southern continent.
Among his many important botanical discoveries in this survey was that of the monarch of all buttercups, the gigantic white-flowered Ranunculus lyallii, the only known species with peltate leaves, the 'water-lily' of the New Zealand shepherds.--Joseph Dalton Hooker (1895) 33 Journal of Botany, p. 209.Lyall, Andrew; "David Lyall (1817–1895): Botanical explorer of Antarctica, New Zealand, the Arctic and North America" (2010) 26:2 The Linnean pp.