Opuntia Helleri
''Opuntia galapageia'' is a species of cactus. It is endemic to the Galápagos Islands, part of Ecuador. Forms occurring on different islands have been treated as separate species and subtaxa of these species. ''Opuntia echios'', ''Opuntia helleri'', ''Opuntia insularis'', ''Opuntia megasperma'', ''Opuntia myriacantha'' and ''Opuntia saxicola'' are now sunk within ''O. galapageia''. Taxonomy ''Opuntia galapageia'' was first described by John Stevens Henslow in 1837. It was first recorded by Charles Darwin on Santiago (James) Island. Darwin was ashore there for nine days in 1835. Subsequently, at least five other species of ''Opuntia'' were described from the Galápagos: ''Opuntia helleri'', ''Opuntia insularis'', ''Opuntia megasperma'', ''Opuntia myriacantha'' and ''Opuntia saxicola''. All were treated by David Hunt in 2006 as included within ''O. galapageia'', a placement accepted by the IUCN Red List as of 2017, although they had been assessed as separate species ...
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John Stevens Henslow
John Stevens Henslow (6 February 1796 – 16 May 1861) was a British priest, botanist and geologist. He is best remembered as friend and mentor to his pupil Charles Darwin. Early life Henslow was born at Rochester, Kent, the son of a solicitor John Prentis Henslow, who was the son of John Henslow. Henslow was educated at St. John's College, Cambridge where he graduated as 16th wrangler in 1818, the year in which Adam Sedgwick became Woodwardian Professor of Geology. Early career Henslow graduated in 1818. He already had a passion for natural history from his childhood, which largely influenced his career, and he accompanied Sedgwick in 1819 on a tour in the Isle of Wight where he learned his first lessons in geology. He also studied chemistry under Professor James Cumming and mineralogy under Edward Daniel Clarke. In the autumn of 1819 he made valuable observations on the geology of the Isle of Man (Trans. Geol. Soc., 1821) and in 1820 and 1821 he investigated the ...
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