Rare, Endangered and Threatened (RET) climbers of Southern Western Ghats, India
© Sarvalingam and Rajendran. 2016
Received: 5 October 2015
Accepted: 23 March 2016
Published: 6 May 2016
Background and Aims
The Mountains of the Western Ghats are the second most important shelter in the world for threatened species. The current paper is an attempt to study the conservation assessment of rare, endangered and threatened species (RET) of the southern Western Ghats. A species is endangered when it is threatened with extinction. Since time began, countless species have gone extinct from natural processes. The present study was conducted to identify the rare, endangered and threatened climbing plants in Southern Western Ghats of Tamil Nadu, India.
The plant collection and identification of the RET listed climbing species of the Southern Western Ghats was done during 2011–2014. The collection and identified RET plant species from the study were selected from different hills (forest) of Tamil Nadu. During the work the selected study sites were visited, plant specimens were collected and systematically pressed, stored for identification.
A total number of 285 climber species comprising 125 genera of 41 families were identified from Southern Western Ghats of Tamil Nadu. Out of 285, 33 species are listed as RET species like Ceropegia mannarana Umam. & Daniel and Gloriosa superba L. fond to be Endangered species and Celastrus paniculata Willd., Aganosma cymosa G.Don. Smilax wightii A. DC., Corallocarpus gracilipes Cong., are rare species. The most specious families include Asclepiadaceae (7 species), Convolvulaceae (5-species) followed by, Fabaceae (4-species), Cucurbitaceae and Liliaceae each 3-species, and all the other remaining families having two or one species each.
Some of the threatened factors such as over-exploitation of natural resources and other anthropogenic activities adversely affect the existing ecosystem and it may lead to the rarity of many species in future. There is an urgent need for developing pragmatic conservation strategies for endemic plants in the southern Western Ghats, which may lead to their effective protection.
KeywordsClimbers RET Southern Western Ghats Tamil Nadu India
India is rich with flowering plants and is considered as one of the mega diversity country in the world. Of the 18,000 species of flowering plants reported from India, one-third is considered endemic in the Western Ghats. Nearly 1600 species of plants were endemic among the 5000 reported species, which includes trees, shrubs, climbers and herbs. There are 54 monotypic genera in the Western Ghats [3, 42]. The southern Western Ghats is by far the richest area in context to floristic composition and concentration of endemic taxa .
Climbers are a typical constituent of rain forest. Climbing plant taxa have greater species richness than their non-climbing sister groups. It is considered that highly diversified clades should show increased among-population genetic differentiation . Climbing plant taxa have greater species richness than their non-climbing sister groups. The majority of lianas are restricted to tropical forests, where they can contribute up to 35 % of the total number of woody plant species and up to 45 % of woody stems present [7, 12, 15, 35].
Climbing plants are found in all kinds of forests and all over the world. Endemic species are more vulnerable to extinction than more widespread species because of their limited geographic ranges and thus have become one of the most effective surrogates for identifying conservation priorities . When conservation resources are limited, identifying priority areas or hotspots where biodiversity is most threatened is critical . The endemism in the flora of a country or geographical region provides an important insight into the biogeography of that region and also to the centers of diversity and adaptive evolution of the floristic components of that region. There has been much interest among bio-geographers to explain why areas of endemism occur, whether it is by a unique combination of ecological factors or because of a history of vicariance and speciation in isolation followed by continued range restriction .
In the past few years some reports have been appeared on the floristic studies of the Western Ghats region [22, 38]. As far as RET climbing plants of the Southern Western Ghats are concerned, no detailed inventory was undertaken in the past. Hence there is an urgent need to conserve each and every RET climbing plant species. Some of the species may be lost without receiving any attention. Since most of the southern Western Ghats are located near the human settlements, human disturbance in these forest are progressively increasing. In view of the above facets, the present study was identify the rare, endangered and threatened climbing plants in southern Western Ghats of Tamil Nadu, India.
The Western Ghats of Tamil Nadu exhibits great plant diversity, due to immense variety of climate, altitude and edaphic factors. Vegetation can broadly be classified into two major categories, namely Vegetation of the interior plains and Vegetation of the hills and mountains and each vegetation category may be further divided into various forest types of the present study area viz. Dry Deciduous Forest, Shrub jungle Forest, Moist Deciduous Forest, Tropical Wet Evergreen Forest, Tropical Semi Evergreen Forest, Tropical Evergreen Forest, Shola forest and Mangrove forest based on “A revised survey of forest types of India” by .
Rare, Endangered and Threatened plants were recorded from the present study area. The plant collection and identification of the RET listed climbing species were selected from different hills (forest) of the Southern Western Ghats, Tamil Nadu from 2011 to 2014. The collected specimens were made into herbarium for identification with standard traditional method. The primary identification of plant specimens done with help of local and regional Floras [14, 18, 19] and the conformity of identification compared with authentic herbarium deposited Botanical Survey of India, Southern Circle, Coimbatore. The threatened status of the plants was confirmed with IUCN Ret list and also the help of using available RET data books and standard publications such as [28, 30–32, 40]. The botanical information was made into a database consisting of binomial name, family, mode of dispersal, source of collection, morphology of useful part and conservation status. The voucher specimens were deposited in Bharathi Herbarium, Department of Botany, Bharathiar University, Coimbatore, Tamil Nadu, India.
Result and Discussion
List of RET climber species of the Southern Western Ghats
Mode of dispersala
Abrus fruticulosus Wight & Arn.
Data Deficient 
Aganosma cymosa (Roxb.) G. Don,
Rare to Western Ghats of Tamil Nadu.
Ampelocissus latifolia (Roxb.) Planch.
vulnerable (IUCN book, 1997)
Argyreia nervosa (Burm. fil.) Bojer
Aristolochia tagala Cham.
Nearly threatened 
Asparagus fysonii J.F.Macbr
Asparagus racemosus Willd.
M & E
Bauhinia phoenicea Wight & Arn.
Endemic To Western Ghats 
Bauhinia vahlii Wight & Arn.
Rare to Tamil Nadu
Celastrus paniculatus Willd.
Nearly threatened 
Ceropegia mannarana P.Umam. & P.Daniel
Corallocarpus gracilipes Cogn.
Coscinium fenestratum (Goetgh.) Colebr.
Critically endangered . Endemic to India (1997 IUCN Red List of Threatened Plants)
Cucumis dipsaceus Ehrenb. ex Spach
Rare to India
Gloriosa superba L.
Grewia heterotricha Mast.
Gymnema khandalense Santapau
Hemidesmus indicus R. Br.
Ipomoea cairica (L.) Sweet
Ipomoea muelleri Benth.
Rare to Tamil Nadu
Ipomoea rumicifolia Choisy
Rare to Tamil Nadu
Operculina turpethum (L.) Silva Manso.
Endangered in peninsular India 
Oxystelma esculentum (L. f.) R. Br. ex Schult.
Least concern (IUCN 2011)
Passiflora leschenaultii DC.
Endemic to peninsular India 
Piper longum L.
Endangered in Tamil Nadu 
Pterolobium hexapetalum (Roth) Santapau & Wagh
Endemic to peninsular India 
Pueraria tuberosa DC.
Rubus racemosus Roxb.
Sarcostemma viminale (L.) R.Br.
Smilax wightii A. DC.
Smilax zeylanica L.
Least concern in Tamil Nadu 
Solena amplexicaulis (Lam.) Gandhi
Intermediate (Kerry Scott Walter and Harriet J. Gillett, 1997)
Toxocarpus beddomei Gamble
Lianas families of Asian forest are dominated by Apocynaceae, Fabaceae, Anonaceae, Combrataceae, Loganiaceae, Rutaceae etc. [9, 13, 20, 21, 24, 44]. The dominance of liana families by Apocynaceae, and Fabaceae in wide-ranging tropical forests  is also evident in this study.
Among the endangered species, Operculina turpethum (Linn.) Silva Manso, Ceropegia mannarana Umam. & Daniel and Gloriosa superba L., Grewia heterotricha Mast. were collected from the study area. Even though the species Gloriosa superba L. was reported as an endangered species, Smilax wightii A. DC. in the earlier research articles and IUCN reported it as Rare but the present study observed it as most abundant species in all types of forests. Some of the rare species, Celastrus paniculata Willd., Aganosma cymosa G.Don. Smilax zeylanica L., Corallocarpus gracilipes Cong., Argyreia nellygherrya Choisy, Argyreia pomacea (Roxb.) Choisy and Coscinium fenestratum (Gartn) Colebr, were collected in the Southern Western Ghats. The present study found that some identified taxa occur only from few samples and have a narrow distribution. It indicates the need to carry out further studies on the flora of climbers in Western Ghats.
The species Cucumis dipsaeceus Enherb., Corallocarpus gracilipes Cong., Bauhinia vahalli Wt Arn., Bauhinia phoenicea Wight & Arn., Passiflora foetida var. ellisonii Vander, Ipomoea mulleri Benth, and Ipomoea rumicifolia Choisy were found to be in rare category with restricted distribution in these forest areas. These species require site-specific conservation strategies.
The present study recorded different climbing mechanisms. The species of the families Convolvulaceae, Menispemaceae and Combrataceae climb by twining around the host plants, tendril climber is the second dominant mechanisms of the present study. Similar studies  were carried out in different tropical forests.
In the area of research, many species are highly exploited for either curative or some other purposes. Out of 33 RET plants, local people were observed to use 15 plants for curative purposes species viz. Aganosoma cymosa G. Don., Argyreia nervosa Dalz., Aristolochia tagala Cham., Bauhinia phoenicea Wight & Arn., Ceropegia mannarana Umam. & Daniel and Coscinium fenestratum (Goetgh.) Colebr. etc. They are using these plants to cure skin diseases, cough, fever, headache, diabetes, rheumatism, asthma, dysentery and poison bites etc. and 9 plants for edible purposes viz. Cucumis dipsaceus Ehrenb, Passiflora leschenaultii DC., Piper Longum L., Rubus racemosus Roxb. and Solena amplexicaulis (Lam.) Gandhi etc. these plants were continuously collected and over exploited by local people in the study regions, which need to be mentioned by concerned official for its sustainability.
Of the total invasive species (Ipomoea cairica (L.) Sweet., Lantana camara L., Ipomoea muelleri Benth, Celastrus paniculatus Willd. and Rubus racemosus Roxb.) Lantana camara L. were the most abundant and occurred in all the study area. These invasive species are ready colonizer in disturbed areas and cause considerable ecological damages to natural areas.
The present study observed that some species fruits of climbers produced by the lianas for sustaining their population (Solena amplexicaulis (Lam.) Gandhi, Smilax zeylanica L., Rubus racemosus Roxb., Passiflora leschenaultii DC. and Piper Longum L. etc.) also sustain numerous birds and other animals species. Therefore, imprudent utilization of lianas could have significant impacts on the forest diversity.
The forest of the southern Western Ghats are prone to diverse distribution like invasion of alien species, illegal timber extraction, collection of non-timber forest products, human settlement, removal of minerals, hill cultivation, cattle grazing and tourism. An urgent requisite for developing practical conservation strategies for RET plants in the Southern Western Ghats may lead their effective protection.
The present study suggests that RET species could gives vital information about the niches and amplitudes of rare endemic, endangered and threatened species in a regional scale. This report can help in identifying areas and habitats of rich concentration of these species so that critical habitat and habitat sites would get priority for conservation.
We thanks to the Professor & Head, Department of Botany, Bharathiar University for providing necessary facilities.
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- Addo-Fordjour P, Anning AK, Larbi JA. Liana species richness abundance and relationship with trees in the Bobiri forest reserve Ghana: impact of management systems. Fort Ecol Manage. 2009;157:1822–8.View ArticleGoogle Scholar
- Ahamedhullah M, Nayar MP. Endemic Plants of the Indian Region. Botanical Survey of India Calcutta. 1986;1:261.Google Scholar
- Ahmedullah M, Nayar MP. Endemic plants of the Indian Region, Peninsular India. BSI Flora of India Ser. 1987;41:143–53.
- Alphons Baby A, Regi Raphael K. First Step Towards Unraveling The Medicinal Properties Of An Endemic Traditional Medicine, Bauhinia Phoenicea Wight And Arn Bark. Int J Pharm Pharm Sci. 2015;7(9):403–5.Google Scholar
- Amalraj VA, Velayudhan KC, Abraham Z threatened medicinal plants in Western Ghats In CK Karunakaran (ed) Proc. Of the Symposium on rare endangered and Endemic Plants of Western Ghats. 1991; 215–20.
- Amirthalingam M. Sacred Groves of Tamil Nadu-A survey CPR Environmental Education Centre Chennai India. 1998.Google Scholar
- Balachandran N, Rajendiran A. Diversity and distribution of angiospermic climbers In Tropical dry evergreen forest of Tamil Nadu India. Inter J Geo Earth and Envir Sci. 2014;4(3):119–29.Google Scholar
- Brummitt N, Nic Lughadha E. Biodiversity: Where’s hot and where’s not. Conserv Biol. 2003;17:1442–8.View ArticleGoogle Scholar
- Cai ZQ, Schnitzer SA, Wen B, Chen YJ, Bongers F. Liana communities in three tropical forest types in Xishuangbanna South-West China. J Trop Forest Sci. 2009;21:252–64.Google Scholar
- Champion HG, Seth SK. A Revised Survey of Forest Types of India. New Delhi: Govt, of India Press; 1968. p. 404.
- Chitale VS, Behera MD, Roy PS. Global biodiversity hotspots in India: significant yet under studied. Curr Sci. 2015;108(2):149–50.Google Scholar
- DeWalt SJ, Chave J. Structure and biomass of four lowland Neotropical forests. Biotropica. 2004;36:7–19.Google Scholar
- Dewalt SJ, Ickes K, Nilus R, Harms KE, Bursdem D. Liana habitat associations and community structure in a Bornean lowland tropical forest. Plant Ecol. 2006;186:203–16.View ArticleGoogle Scholar
- Gamble JS. Flora of the Presidency of Madras. London: Adlard & Sons Ltd.; 1915.View ArticleGoogle Scholar
- Gentry AH. The Distribution and Evolution of Climbing Plants. In: Putz FE, Mooney HA, editors. The Biology of Vines. UK: Cambridge University Press; 1991. p. 3–49.Google Scholar
- Gentry AH, Dodson C. Contribution of non-trees to species richness of a tropical rain forest. Biotropica. 1987;19:149–55.View ArticleGoogle Scholar
- The IUCN Ret list Threatened Species. Data Deficient ver 3.1 2012. http://www.iucnredlist.org/. Accessed 10 Apr 2015.
- Hooker JD. The Flora of British India. Vol. I-VII. London: Reeve & Co; 1872.Google Scholar
- Matthew KM. Flora of Tamil Nadu Carnatic Rapinat Herbarium Tiruchirapally Tamil Nadu Part 1 & 11. 1983.Google Scholar
- Mittermeier RA, Myers N, Gill PC, Mittermeier CG. Hotspots: Earth’s Richest and Most Endangered Terrestrrial Ecoregions. Mexico City: CEMEX; 2004.Google Scholar
- Muthukumar S, Ayyappan N, Parthasarathy N, Mudeppa D, Roman TRS, Selwyn MA, Pragasan LA. Plant community structure in tropical rain forest fragments of the Western Ghats India. Biotropica. 2006;38:143–60.View ArticleGoogle Scholar
- Muthumperumal C, Parthasarathy N. Angiosperms Climbing plants in tropical forests of southern Eastern Ghats Tamil Nadu India. Check List. 2009;5(1):092–111.Google Scholar
- Muthumperumal C, Parthasarathy A. Large-Scale Inventory Of Liana Diversity And Distribution In Tropical Forests Of Southern Eastern Ghats, India. Ph D Thesis. 2011.Google Scholar
- Muthuperumal C, Parthasarathy N. A large scale inventory of lianas diversity in tropical forest of south Eastern Ghats India. Syst Biodi. 2010;8:289–300.View ArticleGoogle Scholar
- Muthuramkumar S, Parthasarathy N. Tree-liana relationships in a tropical evergreen forest at Varagalaiar Anamalais Western Ghats India. J Trop Ecol. 2001;17:395–409.View ArticleGoogle Scholar
- Myers NRA, Mittermeier C, Mittermeier G. Biodiversity hotspots for conservation priority. Nature. 2000;403:853–8.View ArticlePubMedGoogle Scholar
- Nabe-Nielsen J. Diversity and distribution of lianas in a neotropial rain forest Yasuní National Park Ecuador. J Trop Ecol. 2001;17:1–19.View ArticleGoogle Scholar
- Nair NC, Daniel P. The floristic diversity of the Western Ghats and its conservation: A review, Proceedings of the Indian Academy of Sciences (Animal Science/Plant Science) Supplement. 1986. p. 127–63.Google Scholar
- Nayar MP. Hot spots of endemic plants of India, Nepal and Bhutan. Thiruvananthapuram: Tropical Botanic Garden and Research Institute; 1996.Google Scholar
- Nayar MP, Sastry ARK. Red Data Book of Indian Plants. BSI Calcutta Vol 1. 1987.Google Scholar
- Nayar MP, Sastry ARK. Red Data Book of Indian Plants. BSI Calcutta Vol 2. 1988.Google Scholar
- Nayar MP, Sastry ARK. Red Data Book of Indian Plants. BSI Calcutta Vol 3. 1990.Google Scholar
- Nelson G, Platnick NI. Systematic and biogeography: Cladistics and vicariance. New York: Columbia Univ Press; 1981.Google Scholar
- Prabhu Kumar KM, Sreeraj V, Binu Thomas Manudev KM, Rajendran A. Validation and documentation of rare endemic and threatened (RET) plants from Nilgiri, Kanuvai and Madukkarai forests of southern Western Ghats, India. J Threatened Taxa. 2012;4(15):3436–42.View ArticleGoogle Scholar
- Putz FE. Liana biomass and leaf area of a tierra firme forest in the Rio Negro basin, Venezuela. Biotropica. 1983;15:185–9.View ArticleGoogle Scholar
- Putz FE. The natural history of lianas on Barro Colorado Island Panama. Ecology. 1984;65:1713–24.View ArticleGoogle Scholar
- Ramasubbu R. Protecting the wild beauties. Science Reporter. 2010;47(5):19–22.Google Scholar
- Sarvalingam A, Rajendran A. Climbing Plants of the Southern Western Ghats of Coimbatore in India and Their Economic Uses. American-Eurasian J Agric Environ Sci. 2015;15(7):1312–22.Google Scholar
- Schnitzer SA, Carson WP. Tree fall gaps and the maintenance of species diversity in a tropical forest. Ecology. 2001;82:913–9.View ArticleGoogle Scholar
- Scott K, Harriet W, Gillett J. IUCN Red List of Threatened Plants. 1997.Google Scholar
- Sebastinraj J, Britto SJ, Kumar SRS. Micropropagation of Operculina turpethum (L.) Silva manso. Using cotyledonary node explants. Acad J Plant Sci. 2013;6:77–81.Google Scholar
- Shetty BV, Kaveriappa KM, Bhat KG. Plant Resources of Western Ghats and Lowlands of Dakshina Kannada and Udupi Districts. Moodushedde, Mangalore: Pilikula Nisarga Dhama Society; 2002.Google Scholar
- Sivakamasundari, Karuppusamy S Parthipan R. Survey on the RET-listed Medicinal Plants in Thadagamalai Range of Kanyakumari District Tamil Nadu. J Biodivers Endanger Species. 2015; 3:1–4. doi: 10.4172/2332-2543.1000151.
- Sukumaran S, Raj ADS. Rare Endemic Threatened (RET) Trees and Lianas in the Sacred Groves of Kanyakumari District. Indian Forester. 2007;133:1254–66.Google Scholar
- Torres-Díaz C, Ruiz E, Salgado-Luarte C, Molina-Montenegro MA, Gianoli E. Within-population genetic diversity of climbing plants and trees in a temperate forest in central Chile. Gayana Bot. 2013;70(1):36–43.View ArticleGoogle Scholar
- Uma R, Parthipan B. Survey on medico-botanical climbers in Pazhayaru river bank of Kanyakumari District, Tamilnadu. J Medicinal Plants Studies. 2015;3(1):33–6.Google Scholar