Syzygium (Myrtaceae): Monographing a taxonomic giant via 22 coordinated
regional revisions
SYZYGIUM WORKING GROUP
1
Authors listed alphabetically: Berhaman Ahmad
2
, Cláudia Baider
3
, Benedetta Bernardini
4,5
,
Edward Biffin
6
, Fabian Brambach
7
, David Burslem
5
, James W. Byng
4,8
, Maarten J.M.
Christenhusz
4,9
, F. B. Vincent Florens
10
, Eve J. Lucas
9
, Avik Ray
11
, Rajasri Ray
12
, Erik
Smets
8
, Neil W. Snow
13
, Joeri S. Strijk
14
, Peter G. Wilson
15
1
Recommended citation: SYZWG (2016) Syzygium Working Group
2
Faculty of Science & Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400
Kota Kinabalu, Sabah, Malaysia.
3
The Mauritius Herbarium, Agricultural Services, Ministry of Agro-Industry and Food
Security; R. E. Vaughan Building, Réduit, Mauritius.
4
Plant Gateway, 5 Talbot Street, Hertford, Hertfordshire, SG13 7BX, UK.
5
School of Biological Sciences, University of Aberdeen, Aberdeen, AB24 3UU, UK.
6
School of Biological Sciences, University of Adelaide, Adelaide, SA 5005, Australia.
7
Ecology & Ecosystem Research, Georg-August-University Gottingen, Untere Karspule 2,
37073 Gottingen, Germany.
8
Naturalis Biodiversity Center, Botany, P.O. Box 9517, 2300 RA, Leiden, The Netherlands.
9
Royal Botanic Gardens, Kew, Richmond, TW9 3AE, UK.
10
Department of Biosciences, University of Mauritius, Réduit, Mauritius.
11
Centre for Ecological Sciences, Indian Institute of Sciences, Bengaluru, 560012, India.
12
Ashoka Trust for Research in Ecology and the Environment (ATREE), Bengaluru, India
13
Department of Biology, Pittsburg State University, Pittsburg, Kansas, U.S.A.
14
College of Forestry, Guangxi University, Nanning, Guangxi 530005, PR China.
15
Royal Botanic Gardens, Mrs Macquaries Road, Sydney, NSW 2000, Australia
Corresponding author:
James W. Byng
Plant Gateway, 5 Talbot Street, Hertford, SG13 7BX, United Kingdom
Naturalis Biodiversity Center, Botany, P.O. Box 9517, 2300 RA, Leiden, The Netherlands.
Email address:
james.byng@naturalis.nl
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Syzygium Gaertn. is the largest woody genus of flowering plants in the world. Unpublished
but extensive recent herbarium surveys suggest 1200‒1800 species distributed throughout the
Old World tropics and subtropics (Table 1). Until recently, Syzygium exemplified a recurring
taxonomic impediment among megadiverse genera, wherein few taxonomists worked on the
group in any sustained manner, a majority of the herbarium specimens remained
undetermined or misidentified, few if any attempts were made to look at the genus globally,
and limited or no molecular studies were available to provide a predictive phylogenetic
context of the genus. The situation with Syzygium has slowly begun to change as allied genera
have been absorbed into the genus (Biffin et al., 2006; Craven & Biffin, 2010), and predictive
phylogenetically-based infrageneric classifications are emerging. Taxonomic outputs on
Syzygium also have been increasing across its range with the description of new species,
resolution of nomenclatural and typification issues, and some regional revisions being
initiated or updated. However, virtually all regional treatments (which some areas lack) need
urgent revision because they are severely outdated, have limited molecular sampling and are
error-ridden. We are coordinating a genus-wide taxonomic update of Syzygium through a
series of 22 regional revisions, including 9 in the Flora Malesiana region (Figure 1). Each
treatment will include a phylogenetic framework with species descriptions, type information,
synonymy, distributions, ecological notes, and keys. Field images (Figure 2) and/or line
drawings will be included with the goal of every species being illustrated. This working group
has been formed to encourage a coordinated effort to document this unwieldy taxonomic giant
and regional botanists working on the group are encouraged to be involved. A robust
taxonomy of the genus is a prerequisite for testing the many complex questions about
evolution and ecology that Syzygium could help address.
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Figure 1. The regional revisions being prepared.
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Figure 2. Example of field images of Mascarene species. A. S. glomeratum. B. S. contractum. C. S. latifolium. D.
S. coriaceum. E. S. mauritianum. F. S. cymosum. G. S. cadetii. H. S. mamillatum. I. S. commersonii. J. S.
guehoii. K. S. glomeratum. L. S. coriaceum. M. S. rampans. N. S. mauritianum. O. S. mamillatum. E, J & N by
C. Baider and all other photos by J.W. Byng.
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Table 1. The twenty-two regional revisions being prepared towards a global monograph on Syzygium, with current and estimated diversity and notable references.
†
Estimated
figures are following sorting of herbarium specimens at K, L, MO, P and WAG.
Region
Current
taxa
Estimated
taxa
†
Notable references
1. Continental Africa
31
25
Keay (1954), Amshoff (1966, 1970), Boutique (1968), White (1978), Verdcourt (2001), Coates-Palgrave
(2002)
2. Madagascar and the Comoros
archipelago
25
35
Perrier de la
Bâthie (1952, 1953), Labat & Schatz (2002), Snow (2010), Byng (2015), Byng et al.
(2015b, 2016)
3. Mascarenes (Mauritius, La
Réunion, Rodrigues) and Seychelles
Islands
20
22
Baker (1877), Scott (1980, 1990), Bosser et al. (1987), Friedmann (1994), Bosser & Florens (2000),
Byng et al. (2015a)
4. Indian subcontinent (Andaman
Islands, Bangladesh, Bhutan, India,
Nepal)
86
89
Wight (1841), Duthie (1878-9), Kanjilal et al. (1938), Chithra (1983), Long & Rae (1991), Saldanha
(1996), Almeida (1998), Nayar et al. (2006), Shareef et al. (2012, 2013, 2014), Sujanapal et al. (2013),
Ramana et al. (2014), Byng et al. (2015c)
5. Sri Lanka
36
37
Ashton (1981), Kostermans (1981)
6. Myanmar
50
90
Kurz (1873, 1877), Mason (1951), Kress et al. (2003)
7. China
80
95
Merrill & Perry (1938a, 1939b), Chen & Craven (2007)
8. Thailand
96
105
Craib (1931), Chantaranothai & Parnell (1993, 1994, 2002), Chantaranothai (2001, 2014)
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9. Indochina (Cambodia, Laos,
Vietnam)
56
60
Merrill & Perry (1938b), Soh & Parnell (2011, 2015)
10. Peninsular Malaysia
140
180
King (1901), Henderson (1949), Turner (1995), Kochummen (1995)
11. Sumatra
90
175
Blume (1849), Widodo (2011a, b), Widodo et al. (2010)
12. Borneo
192
250
Blume (1849), Merrill & Perry (1939a), Davis (1997), Ashton (2006, 2011)
13. Java
62
80
Blume (1849), Amshoff (1944, 1945), Veldkamp (2003)
14. Philippines
190
185
Robinson (1909), Elmer (1912, 1914), Merrill (1915, 1921, 1923, 1951)
15. Sulawesi
14
105
Blume (1849)
16. Lesser Sunda Islands
9
45
N/A
17. Moluccas
14
65
Blume (1849)
18. New Guinea
190
250
Ridley (1916), Diels (1922, 1916), Hartley & Craven (1977), Merrill & Perry (1942a), Hartley & Perry
(1973), Takeuchi (2002, 2015), Snow & Craven (2010), Conn & Damas (2015)
19. Australia
78
78
Hyland (1983), Craven (2003), Craven et al. (2005)
20. Melanasia (incl. Fiji, Solomon
Islands, Vanuatu)
66
75
Merrill & Perry (1942a, 1942b), Perry (1950), Smith (1985), Whitmore (1967), Craven et al. (2005),
Tuiwawa et al. (2013)
21. New Caledonia (incl. Lord Howe
Island, New Zealand)
75
100
Dawson (1999), Snow et al. (2016, in prep.)
22. Polynesia (incl. Hawaii, Niue,
Samoa, Tonga) and Micronesia
23
25
Melville (1955), Yuncker (1959), Whistler (1988), Snow & Veldkamp (2010), Costion & Lorence
(2012), Tornabene & Wagner (2013)
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PeerJ Preprints |
https://doi.org/10.7287/peerj.preprints.1930v1
| CC-BY 4.0 Open Access | rec: 5 Apr 2016, publ: 5 Apr 2016
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