| Authorised form of name | Cockayne; Leonard (1855 - 1934); botanist | 
| Dates | 1855 - 1934 | 
| Nationality | British | 
| Place of birth | Thorpe House, Norton Lees, Derbyshire, England | 
| Date of birth | 07 April 1855 | 
| Place of death | Wellington, New Zealand | 
| Date of death | 08 July 1934 | 
| DatesAndPlaces | Burial: Otari-Wilton Bush, Wellington, New Zealand | 
| Occupation | botanist | 
| Research field | Plant sciences | 
| Botany | 
| Activity | Education: Wesley College, Sheffield; Owens College, Manchester; Hon PhD (Munich); Hon DSc (1932, New Zealand)
 Career:
 Published his first New Zealand account of successional changes in vegetation (1899); presented a paper, at the first conference of New Zealand horticulturalists at Dunedin, on the plants of the Chatham Islands and advocated for the establishment of experimental plant research stations in New Zealand (1901); member of the 1907 Sub-Antarctic Islands Scientific Expedition; frequently corresponded with numerous botanists from around the world, facilitating botanical visits there and the publication of New Zealand papers in overseas journals (1926-1928).
 Honours:
 CMG 1929
 Memberships:
 FRSNZ (1919); FLS
 Awards/Medals:
 Hector Memorial Medal (1912)
 Hutton Memorial Medal (1914)
 Veitch Memorial Medal (1932)
 | 
| Membership category | Fellow | 
| Date of election | 02/05/1912 | 
| Age at election | 57 | 
| Proposer | Joseph Dalton Hooker; William Blaxland Benham; David Prain; Arthur Dendy; William Botting Hemsley; Alfred Barton Rendle; Otto Stapf; John Walter Gregory; John Bretland Farmer; Daniel Oliver; William Turner Thiselton-Dyer; James William Helenus Trail | 
| RSActivity | Medals and prizes: Darwin Medal 1928
 | 
| Relationships | Parents: William Cockayne, merchant. Spouse: Maud Cockayne.
 Children: Alfred Cockayne (1880-1966), botanist, agricultural scientist, and administrator.
 | 
| PublishedWorks | RCN 21438 RCN R79094
 RCN 21439
 RCN 23733
 RCN 10823
 | 
| OtherInfo | Remembered for his constibutions to plant ecology and his theories of plant hybridisation. | 
| Royal Society Obituary or Memoir | Click to view (may be contained within a meeting notice, presidential address or list of death notices) | 
| Source | Sources: Bulloch's Roll; DNZB
 Obituaries:
 Obituary Notices of Fellows of the Royal Society 1932-1935 vol l pp 443-457, plate, by A W Hill
 References:
 Robin J H Clark and Michael J Kelly, 'New Zealand, New Zealanders and the Royal Society' in NR 1994 vol 48 pp 263-281
 | 
| Code | NA8043 | 
| RefNo | Title | Date | 
| EC/1912/03 | Cockayne, Leonard: certificate of election to the Royal Society |  | 
| NLB/46/582 | Copy letter from Robert William Frederick Harrison, to [Leonard] Cockayne, Fellow of the Royal Society, 181 Linwood Avenue, Christchurch, New Zealand | 27 September 1912 | 
| NLB/54/860 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. [Leonard] Cockayne, FRS | 23 October 1917 | 
| NLB/67/470 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr [Leonard] Cockayne, FRS | 5 January 1925 | 
| NLB/55/750 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. Leonard Cockayne, FRS | 22 August 1918 | 
| NLB/63/528 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society and FRS; to Dr. Leonard Cockayne, FRS | 03 November 1922 | 
| NLB/64/769 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Edward Bagnall] Poulton, FRS. | 15 June 1923 | 
| NLB/67/661 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Vernon Herbert] Blackman, FRS | 9 February 1925 | 
| NLB/71/794 | Copy letter from Henry Hallett Dale, Secretary of the Royal Society; to Dr. [Leonard] Cockayne, FRS | 1 November 1928 | 
| NLB/71/951 | Copy letter from David Prain, Treasurer of the Royal Society; to Messrs. Coutts and Co. | 17 December 1928 | 
| NLB/71/891 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the High Commissioner for New Zealand, 415 Strand, WC2 | 1 December 1928 | 
| NLB/71/965 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr. [Leonard] Cockayne, FRS | 19 December 1928 | 
| NLB/71/907 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Chief Clerk, New Zealand Government Offices, 415 Strand, WC2 | 5 December 1928 | 
| CD/5/9 | Copy letter from Professor [William Blaxland] Benham, to James Hopwood Jeans, Secretary of the Royal Society | 5 August 1922 | 
| MC/27/69 | Letter from Leonard Cockayne, 181 Linwood Avenue, Christchurch, New Zealand, to The Treasurer, Royal Society of London | 2 May 1912 | 
| IM/000901 | Cockayne, Leonard | nd | 
| MC/25/185 | Letter from [David] Prain, Kew, to Mr [Robert] Harrison, The Assistant Secretary, The Royal Society, Burlington House, Piccadilly | 8 December 1910 | 
| MC/27/70 | Letter from Leonard Cockayne, 181 Linwood Avenue, Christchurch, New Zealand, to [Robert] Harrison, Assistant Secretary, [Royal Society] | 4 July 1912 | 
| MC/27/68 | Letter from Leonard Cockayne, 181 Linwood Avenue, Christchurch, New Zealand, to The Secretary, Royal Society | 25 April 1912 | 
| MC/27/71 | Letter from Leonard Cockayne, 181 Linwood Avenue, Christchurch, New Zealand, to [Robert] Harrison, Assistant Secretary, [Royal Society] | 19 September 1912 | 
| MC/27/67 | Letter from Leonard Cockayne, 181 Linwood Avenue, Christchurch, New Zealand, to [Alfred Bray] Kempe, Treasurer, Royal Society | 25 April 1912 | 
| NLB/46/63 | Copy letter from Robert William Frederick Harrison, to Leonard Cockayne, Fellow of the Royal Society, 181 Linwood Avenue, Christchurch, New Zealand | 5 June 1912 | 
| NLB/46/805 | Copy letter from Robert William Frederick Harrison, to [Leonard] Cockayne, Fellow of the Royal Society, 181 Linwood Avenue, Christchurch, New Zealand | 5 November 1912 | 
| MC/32/55 | Letter from [Leonard] Cockayne, Ngaio, Wellington, New Zealand, to [Robert] Harrison, [Assistant] Secretary, Royal Society] | 24 August 1917 |