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Note on Identity and Distribution of Cynometra Iripa Kostel. and C

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Note on Identity and Distribution of Cynometra Iripa Kostel. and C 13 6 805 Ragavan et al NOTES ON GEOGRAPHIC DISTRIBUTION Check List 13 (6): 805–812 https://doi.org/10.15560/13.6.805 Note on identity and distribution of Cynometra iripa Kostel. and C. ramiflora L. (Fabaceae) in the Andaman and Nicobar Islands, India P. Ragavan,1 T. S. Rana,2 K. Ravichandran,3 R. S. C. Jayaraj,4 K. Sivakumar,5 Alok Saxena,3 P. M. Mohan6 1 SERB, National Post Doctoral Fellow, CSIR, National Botanical Research Institute, Rana Pratap Marg, Post Box No. 436, Lucknow 226001, India. 2 CSIR, National Botanical Research Institute, Rana Pratap Marg, Post Box No. 436, Lucknow 226001, India. 3 Department of Environment and Forest, Andaman and Nicobar Administration, Port Blair-744102, Andaman and Nicobar Islands, India. 4 Rain Forest Research Institute, Jorhat-785010, Assam, India. 5 Centre for Advances studies in Marine Biology, Annamalai University, Parengipettai, Tamil Nadu, India. 6 Department of Ocean Studies and Marine Biology, Pondicherry University, Brookshabad Campus, Port Blair-744112, Andaman and Nicobar Islands, India. Corresponding author: P. Ragavan, [email protected] Abstract The present study revealed the identity and distribution of Cynometra iripa and C. ramiflora in the Andaman and Nicobar Islands, India. Of these, C. iripa is often classified as true mangrove species, whereas C. ramiflora is a man- grove associate. Apex of leaflets, length of inflorescences, length of pedicels, apex of anthers and position of fruit beak are distinguishing key characters between C. iripa and C. ramiflora. Photographs, a key to the species, and notes on nomenclatural ambiguity are provided. Key words Cynometra spp; Andaman and Nicobar Islands; mangroves; distribution. Academic editor: Amit Kumar | Received 15 September 2017 | Accepted 24 October 2017 | Published 17 November 2017 Citation: Ragavan P, Rana TS, Ravichandran K, Jayaraj RSC, Sivakumar K, Saxena A, Mohan PM (2017) Note on identity and distribution of Cynometra iripa Kostel. and C. ramiflora L. (Fabaceae) in the Andaman and Nicobar Islands, India. Check List 13 (6): 805–812. https://doi. org/10.15560/13.6.805 Introduction problematic as C. iripa was considered as a variety of C. ramiflora in the past (Meeuwen 1970). Cymorium sylves- The genus Cynometra L. (Fabaceae) consists of about tre of Rumphius (1741: pl. 63) was described as Cynometra 85 species distributed in the tropical regions (Mabber- ramiflora by Linnaeus (1753), which is characterized by ley 2008). The genus is characterised by unijugate or unijugate leaves. Iripa of Rheede (1682: pl. 31) was bi jugate leaves, small bud scales, 4 calyx lobes, 5 petals, described as Cynometra iripa by Kosteletzky (1835), 10 stamens, and 1-seeded fruits. In India, Cynometra is which is characterized by bijugate leaves. However, most represented by 7 species: C. beddomei Prain, C. bourdil- of the subsequent botanists described Cynometra iripa as lonii Gamble, C. iripa Kostel., C. malaccensis Meeuwen, varietal form of C. ramiflora. For instance, Prain (1897) C. ramiflora L., C. travancorica Bedd., and C. cauliflora described 2 subspecies of C. ramiflora, subsp. gen- L. (Sanjappa 1992). Of these, taxonomical identity and uina (unijugate form) and subsp. bijuga (bijugate form), distribution of C. ramiflora and C. iripa have often been based on number of leaflets. Furthermore, he recognized Copyright Ragavan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 806 Check List 13 (6) 2 varieties of subsp. bijuga based on leaflet size and tip including A & N Islands. Kathiresan (2008) reported the shape: var. mimosoides (smaller leaflets with obtuse tip) occurrence of both C. ramiflora and C. iripa from the and var. heterophylla (larger leaflets with acute to acumi- Sundarbans, Odisha and A & N Islands and only C. iripa nate leaflets). Thus, it is noteworthy that Prain described from Maharashtra. Mandal and Naskar (2008) reported the bijugate form of C. ramiflora as var. heterophylla and the occurrence of only C. ramiflora in all the mangrove unijugate as subsp. genuina, whereas var. mimosoides habitats of India, except Lakshadweep, without descrip- was used to describe C. iripa. Subsequently, Prain (1903) tion and locality data. Hence, keeping all the previous separated var. mimosoides from C. ramiflora and treated it studies in view, present study was undertaken with the as a distinct species. From this, it is apparent that C. iripa objective to resolve the nomenclatural ambiguity of C. was placed as distinct species by Prain (1903) and var. iripa and C. ramiflora in the A & N Islands and to docu- heterophylla and subsp. genuina (i.e., the unijugate and ment their distribution. bijugate forms of C. ramiflora respectively) were placed under C. ramiflora L. In the taxonomical revision of the Methods genus Cynometra, Meeuwen (1970) also treated “subsp. genuina” and “subsp. heterophylla” as synonyms of C. Recent floristic study on species diversity and distribu- ramiflora and “var. mimosoides” and “subsp. bijuga” are tion of mangroves of the A & N Islands revealed the treated as synonyms of C. iripa. Further, he also noted occurrences of 2 species of Cynometra, C. iripa and C. that “for no obvious reason, C. iripa was considered in ramiflora.Specimens were collected to assess the numeric the past as a variety of C. ramiflora and it is entirely dif- and multistate attributes of a wide range of vegetative and ferent from C. ramiflora; the only character they share reproductive morphological characters and were identi- is a deeply rugose pod, but even the shape of the pod fied using regional floras (Baker 1878, Brandis 1906, is different”. Ding Hou et al. (1996) also described the Prain 1903, Parkinson 1923), monographs (Meeuwen Cynometra species in Flora Malesiana based on the taxo- 1970, Prain 1897), and standard references (Tomlinson nomical revision of Meeuwen (1970). 1986, Giesen et al. 2006). Collected specimens were also Both C. iripa and C. ramiflora were known from Anda- compared with specimens deposited at the Andaman and man and Nicobar Islands (A & N Islands). However, the Nicobar Regional Centre, Botanical Survey of India, Port identity and distribution of C. iripa and C. ramiflora are far Blair (PBL) and electronic resources such as the Angio- from complete. For instance, in Forest flora of Andamans, sperm Phylogeny Website (Stevens 2001), Tropicos of Parkinson (1923) reported 2 varieties of Cynometra rami- Missouri Botanical Garden, REMIB (World Biodiversity flora—var. heterophylla and var. mimosoides. He further Information Network), Kew Herbarium Database, Global emphasized that terminal leaflets are much larger than the Plants Initiative, ePIC (electronic Plant Information Cen- lower and acute in var. heterophylla, whereas in var. mimo- tre 2002), and IPNI (The International Plant Names Index soides terminal leaflets are hardly larger than the lower and 2012). Voucher specimens of C. iripa (Accession No. obtuse. He also pointed out that the former one was very 30939, 30940) and C. ramiflora (Accession No. 30941, rare and latter was most common behind the mangrove 30942) have been deposited at PBL. swamps in the Andaman Islands. Those notes clearly indi- cated that his var. heterophylla was C. ramiflora and var. mimosoides was C. iripa. Subsequent to Parkinson (1923), Results C. ramiflora and C. iripa are reported by Dagar (1987), Of the 51 sites surveyed, C. iripa was recorded at 29 Dagar et al. (1991), Dagar and Singh (1999), and Debnath sites in the Andaman Islands, whereas few individuals (2004). Among them, Dagar (1987) and Dagar et al. (1991) of C. ramiflora were recorded from Chidiyatapu, South classified both the species as true mangroves and noted Andaman (Fig. 1). None of them was recorded from the that C. ramiflora is common in the A & N Islands and C. Nicobar Islands. Taxonomical description and photo- iripa is rare, whereas Debnath (2004) classified these spe- plates of C. iripa and C. ramiflora of A & N Islands has cies as mangrove associates and noted that C. ramiflora is also been provided to facilitate identification. The distin- very rare and C. iripa is common everywhere behind the guishing key characters of both the species are given in mangrove swamps. Dagar and Singh (1999) reported C. Table 1. iripa and 3 varieties of C. ramiflora—var. heterophylla, var. bijuga, and var. mimosoides—but the descriptions are Key to existing species of Cynometra species in the not clear. Further, none of them have given locality data for A & N Islands C. ramiflora in the A & N Islands. 1a Leaves 2-jugate, upper leaflets not much unequal; In the bibliographic and distributional account on rachis of inflorescences 0.2–0.35 cm long; flowers legumes of India Sanjappa (1992) reported both the with bent style; fruits rugose with prominent lateral species and noted that C. iripa is found in Odisha, West beak ................................C. iripa Bengal and A & N Islands, whereas C. ramiflora is found 1b Leaves 1- or 2-jugate, upper leaflets much larger than only in the A & N Islands. In contrast, Lakshmina- lower; rachis of inflorescences 1–2 cm long, flowers rasimhan (1999) reported only C. iripa from the A & N with straight style; fruits rugose with sub-terminal Islands and noted that C. ramiflora is not found in India beak ............................C. ramiflora Ragavan et al. | Cynometra iripa and C. ramiflora in the Anadaman and Nicobar Islands 807 Figure 1. Map showing study area. Red spots indicate sites surveyed in A & N Islands, green star indicates localities of Cynometra iripa, and blue star indicates locality of C. ramiflora. South Andaman: 1. South bay; 2. Chidiyatapu; 3. Burmanallah; 4. Beadonabad; 5. Corbyn’s Cove; 6. Sippighat; 7. Manjeri; 8. Guptapara; 9. Manglutan; 10. Wandoor; 11. Ograbraj; 12. Bambooflat Creek; 13. Wright Myo creek; 14.
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