Journal of Threatened Taxa | www.threatenedtaxa.org | 26 June 2018 | 10(7): 11895–11915

Floristic enumeration of Torna Fort (Western Ghats, India): a storehouse of endemic plants

Mayur D. Nandikar ¹, Priyanka T. Giranje ² & Durga C. Jadhav ³

^1,2,3 Naoroji Godrej Centre for Plant Research, 431, Lawkim Campus, Shindewadi, Shirwal, Satara, Maharashtra 412801, India

¹ mnandikar@gmail.com, nandikar@godrej.com (corresponding author), ² priyagiranje24@gmail.com, ³ durgacjadhav@gmail.com

Abstract: The forts on hilltops of the Sahyadri (northern Western Ghats) have seen a turbulent historical past and are famous for their architectural style and cultural heritage. Besides this, these hilltops are home to an incredible plant diversity. One of the highest hilltop forts (ca. 1,403m) the Torna, has been explored since 2012 for floral assessment. The study documented ca. 399 plant species of which about 28% are endemic to the Western Ghats and 16 monotypic species were recorded. A brief account of the immense floristic diversity and new findings from Torna fort are summarized in the present article.

Keywords: Endemism, hilltop forts, flowering plants, northern Western Ghats.

doi: http://doi.org/10.11609/jott.3705.10.7.11895-11915

Editor: Aparna Watve, Biome Conservation Foundation, Pune, India. Date of publication: 26 June 2018 (online & print)

Manuscript details: Ms # 3705 | Received 29 September 2017 | Final received 01 June 2018 | Finally accepted 13 June 2018

Citation: Nandikar, M.D., P.T. Giranje & D.C. Jadhav (2018). Floristic enumeration of Torna Fort (Western Ghats, India): a storehouse of endemic plants. Journal of Threatened Taxa 10(7): 11895–11915; http://doi.org/10.11609/jott.3705.10.7.11895-11915

Copyright: © Nandikar et al. 2018. Creative Commons Attribution 4.0 International License. JoTT allows unrestricted use of this article in any medium, reproduction and distribution by providing adequate credit to the authors and the source of publication.

Funding: Naoroji Godrej Centre for Plant Research.

Competing interests: The authors declare no competing interests.

Author Details: Dr. Mayur D. Nandikar - presently working in the area of plant taxonomy and conservation as a Scientist and Head at Naoroji Godrej Centre for Plant Research (NGCPR) Shirwal. Ms. Priyanka T. Giranje - research fellow at NGCPR, working in biosystematics studies on the genus Ledebouria in India and also studying the endemic plants from the northern Western Ghats. Ms. Durga C. Jadhav - research fellow at NGCPR, studying the genus Salacia in India and also engaged in documentation of local flora from Satara District.

Author Contribution: MDN - Project design, proposal, implementation, plant collection, photography, data interpretation, editing. PTG - Plant collection, endemic plant enumeration, herbarium preparation, manuscript writing. DCJ - Plant collection, data processing, herbarium preparation, manuscript writing.

Acknowledgements: Authors are thankful to Mr. Vijay M. Crishna, Director, Naoroji Godrej Centre for Plant Research (NGCPR) for the consistent support and encouragement and Dr. K.V.C. Gosavi, HPT Arts & KCK Sci. College, Nashik for assistance in grass identification and photographs. We extend our thanks to Dr. Vinod Shimple, Dr. Nilesh Pawar, Dr. Alok Chorghe, and Kishor KC for assisting in the field tours to the Torna Fort. We are also thankful to anonymous reviewers for their critical comments on the draft and conceptualizing an idea about BHS in the view of conservation.

INTRODUCTION

India is one of the megabiodiverse countries of the world. It has diverse biogeography, and consists of about 18,000 plant species, which is almost 11% of total species in the world (Singh et al. 2015). One of the global biodiversity hotspots, the Western Ghats consist more than 7,400 plant species of which 1,270 are endemic (Nayar et al. 2014). Mountain ranges of the northern Western Ghats are commonly known as Sahyadri. These ranges are very diverse in the habitats, flora and fauna.

The northern Western Ghats spreads from Tapti (Gujarat) to Goa with an average elevation of 900m. Torna hilltop with an altitude 1,403m is one of the tallest peaks in Maharashtra and highest peak in Pune District. It is one of the renowned historical forts, which served as the capital of Maratha dynasty for 25 years and lies 50km southwest of Pune City in Velhe Tehsil.

Hilltop forts in Sahyadri are famous for their architectural style, cultural heritage and for being witness to the turbulent historical past. In addition, these forts and adjoining areas possess specific habitats like flat summits, rocky flanks, crevices, precipitous slopes, which shelter extremely rich plant diversity. Previous documentation of these centres of floristic diversity includes Sinhagad, Purandar and Khandala (Santapau 1951, 1957, 1967), Torna Hills, Katraj Ghats and Rajgad Fort (Vartak 1953, 1960, 1965), Harishchandragad (Billore & Hemadri 1969), and the enumeration of vegetation from hilltops near Pune and adjoining areas (Cooke 1901–1908; Razi 1952). Moreover, new species and new additions to the state flora have been published from these hilltops during the last century. Detailed study on the endemism from these hilltops has not been done so far and therefore, the present study on floristic assessment and endemism is the beginning of this endeavour.

METHODS

Study area

The study was in and around Torna Fort which is situated between 18.29059722⁰N and 73.62444444⁰E, 18.26516389⁰N and 73.61055556⁰E, covering a study area of ca. 10,000ha. It ranges from the foot of the mountain at village Velhe, Pune (750m) to the hilltop of Torna Fort situated at 1,403m and about 50km southwest of Pune, Maharashtra (Image 1). Foothill soil is mainly composed of ‘moorum’ (a soil type, comprising small pieces of disintegrated rock or shale) and red soil while slopes have loose red soil, the plateau top has very shallow soil cover on basalt. Average rainfall during the six months of monsoon is around 900mm (Maharashtra State Gazetteer 1992). Torna Fort is frequently visited by tourists, trekkers, and nature lovers during the monsoon. Hilltop and slopes are used by local inhabitants for grazing and collection of fuel wood. Widening of the tar road have opened a corridor for tourist vehicles up to the middle of the fort and it can be referred to as a possible threat to the habitat.

Data collection

Our study is an outcome of continuous expeditions to the Torna Fort during 2012–2017. Plant materials were collected during regular field visits at different seasons. Bridson & Forman (1999) have been followed for herbarium preparations. The identity of plants was confirmed with the help of floras (Cooke 1901–1908; Lakshminarasimhan 1996; Singh & Karthikeyan 2000, 2001). The collected specimens have been deposited at NGCPR with accession details. Besides this Agharkar Research Institute, Pune (AHMA) and Fergusson College Herbarium, Pune have been consulted for the specimens collected by V.D. Vartak from Torna and adjoining area. Endemic statuses of plants were confirmed by using research publications (Tetali et al. 2000; Gaikwad et al. 2014; Nayar et al. 2014; Singh et al. 2015). The families have been arranged alphabetically. Binomials and nomenclature follows the International Plant Name Index (IPNI 2012). The monotypic taxa have been identified (Rana & Ranade 2009). Categorization for threat has followed the IUCN (2017). A glimpse of endemic plants is featured in the images (Images 3–7).

RESULTS

Torna Fort shows a high degree of variation in habitats and in vegetation patterns. The plateau and plains are covered with grasses, sedges, orchids, scrophulariaceae, legumes and other ephemerals, Strobilanthes, etc. (Image 2 C & G). Vertical rocky cliffs are covered with liverworts, mosses, ferns, balsams, lithophytic grasses, Begonias, Senecio edgeworthii Hook. f., etc. (Image 2E). Vegetation on slopes are dominated by large number of endemic species, viz., Ceropegia sahyadrica Ansari & B.G.P.Kulk., Chlorophytum glaucum Dalzell, Neuracanthus sphaerostachys (Nees) Dalzell, Adenoon indicum Dalzell, Strobilanthes sessilis Nees, S. callosus Nees, Barleria sepalosa C.B. Clarke, Delphinium malabaricum (Huth) Munz, Adelocaryum malabaricum (C.B. Clarke) Brand, Echinops echinatus Roxb., and Thalictrum dalzellii Hook (Image 2B). Rocky crevices have Flemingia rollae (Billore & Hemadri) Anand Kumar and Cyanotis tuberosa (Roxb.) Schult. & Schult.f. Hillslopes and valleys are occupied by Strobilanthes callosus Nees, and the undergrowth shelters species like Ceropegia maccannii Ansari, C. oculata Hook., C. media (H. Huber) Ansari, Vigna sahyadriana Aitwade et al., Cucumis setosus Cogn., C. ritchiei Ghebret. & Thulin, Argyreia cuneata (Willd.) Ker Gawl., Aeginetia indica L., and Abutilon ranadei Woodrow & Staf (Image 2D). Different micro-habitats are enlisted for each plant species separately in Table 1.

A total of 399 angiosperm species which comprised 274 genera and 73 families are listed in the present study (Table 1); 269 are dicotyledonous which belong to 199 genera and 59 families and 130 are monocotyledonous, which belong to 75 genera and 14 families. Poaceae dominated the list by having a total of 89 species, followed by Fabaceae (41 spp.), Asteraceae (30 spp.), Acanthaceae (17 spp.), and Euphorbiaceae (13 spp.). Poaceae comprises 52 genera, followed by Fabaceae (24 genera), Asteraceae (24 genera), Acanthaceae (15 genera), Apocynaceae and Rubiaceae (nine genera each). The most diverse genera are Ischaemum (8 spp.), Euphorbia, Smithia, and Habenaria (7 spp. each), Dioscorea, Arthraxon and Eragrostis (5 spp. each), Arundinella, Ceropegia, Ficus, Tripogon and Vigna (4 spp. each). Six families are represented by a single genus and 22 families are represented by a single species. The vegetation is also diversified in habits (Table 1) like annual, perennial, parasitic herbs, shrubs, scandent shrubs, trees, climbers, and lianas.

DISCUSSION

From the 399 plant species documented, 109 species (27.31%) are referred to as endemic to the Western Ghats and India. The Torna Fort is enriched with eight species of Ischaemum L. (4 endemic), seven species of Habenaria Willd. (5 endemic), seven species of Euphorbia L. (2 endemic), seven species of Smithia Aiton (5 endemic), four endemic species of Ceropegia L. (3 rare in occurrence) (Nayar & Sastry 1987, 1988, 1990). Sixteen species viz. Triplopogon ramosissimus (Hack.) Bor, Indopoa paupercula (Stapf) Bor, Moullava spicata (Dalzell) Nicolson, Tamarindus indica L., Aegle marmelos (L.) Correa, Urena lobata L., Erinocarpus nimmonii J. Graham, Frerea indica Dalzell, Hemidesmus indicus (L.) R.Br., Haldina cordifolia (Roxb.) C.E. Ridsdale, Spermadictyon suaveolens Roxb., Calacanthus grandiflorus (Dalzell) Radlk., Colebrookea oppositifolia Sm., Adenoon indicum Dalzell, Pinda concanensis (Dalzell) P.K. Mukh. & Constance and Trilobachne cookei (Stapf) Schenck ex Henrard are recorded as monotypic.

Torna Fort is the only repository for the Critically Endangered Barleria sepalosa C.B. Clarke (Acanthaceae) which is rediscovered after a lapse of 128 years (Gosavi et al. 2013), and the recent study also extends the distribution of Flemingia rollae (Fabaceae), the species which was earlier known from its type locality at Kalsubai Hilltop, Ahmednagar, Maharashtra (Gavade et al. 2016).

In the context of anthropogenic activities and threat to the habitats, many hilltops like the table land of Panchgani (Satara District), Sinhagad Fort (Pune District), Panhala (Kolhapur District) are prone to disturbances viz., tourism, overgrazing, invasive species and grassland fires. Poor planning of tourism and lack of awareness regarding the unique habitat and vegetation are serious threats to these areas. Present efforts have been made to create awareness amongst the visitors, authorities and custodians as authors have witnessed the developmental activities like clearing of roadside vegetation for widening of roads and new road construction during the last four years at Torna Fort. The earlier enumeration by Vartak (1953) listed 241 species while the present study of Torna lists 399 angiosperms of which 109 (27.31%) are endemic to India. The detailed plant enumeration with its endemism, distribution, phenology, habitat and habit has been tabulated in Table 1.

CONCLUSION

Torna Fort in the northern Western Ghats exhibits habitat diversity with annual and perennial floristic components. The fort stands as a storehouse of endemic and unique floral diversity. The topography, elevation and distinct climatic conditions make the fort different from other lowland floristic habitats. Although, Torna Fort is in consideration for tourism development by the government as archaeological monument, we strongly believe that presence of endemic, threatened plant species and unique habitats can be adequate for ‘Biodiversity Heritage Sites’ to ensure further conservation measures.

REFERENCES

Billore, K.V. & K. Hemadri (1969). Observation on the flora of Harishchandragarh, Sahyadri range, Maharashtra. Bulletin of Botanical Survey of India 11: 335--–346.

Bridson, D. & L. Forman (1999). The Herbarium Handbook. 3^rd Edition. Royal Botanic Gardens, Kew, UK.

Cooke, T. (1901–1908). The Flora of the Presidency of Bombay. Vol. 1 & 2 . Taylor & Francis, London.

Gaikwad, S., R. Gore, K. Garad & S. Gaikwad (2014). Endemic flowering plants of nothern Western Ghats (Sahyadri Ranges) of India: A checklist. Checklist 10(3): 461–472; http://doi.org/10.15560/10.3.461

Gavade, S.K., M.D. Nandikar, V.B. Shimpale & M.M. Lekhak (2016). A new location for a rare legume Flemingia rollae (Family Fabaceae) and notes on its typification. Journal of the Bombay Natural History Society 113: 48–49.

Gosavi, K.V.C., A.D. Nalawade & S.R. Yadav (2013). Taxonomic identity, rediscovery and epitypification of Barleria sepalosa (Acanthaceae) from northern Western Ghats, India. Rheedea 24(1): 23–26.

IUCN (2017). The IUCN Red List of threatened species. Version 2017.1. International Union for Conservation of Nature Accessed at http://www.iucnredlist.org. Accessed on 26 May 2017.

Lakshminarasimhan, P. (1996). Monocotyledones In: Sharma, B.D., S. Karthikeyan & N.P. Singh (eds.). Flora of Maharashtra State. Calcutta, Botanical Survey of India, 794pp.

Maharashtra State Gazetteer, Pune District (1992). http://gazetteers.maharashtra.gov.in. Accessed at 13 December 2016.

Nayar, T.S., M. Sibi & A.R. Beegam (2014). Flowering Plants of the Western Ghats, India, Vol.1 and Vol.2. Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Kerala, India.

Nayar, M.P. & A.R.K. Sastry (eds.) (1987). Red Data Book of Indian Plants, Vol. 1. Calcutta, Botanical Survey of India, 367pp.

Nayar, M.P. & A.R.K. Sastry (eds.) (1988). Red Data Book of Indian Plants, Vol. 2. Calcutta, Botanical Survey of India, 150pp.

Nayar, M.P. & A.R.K. Sastry (eds.) (1990). Red Data Book of Indian Plants, Vol. 3. Calcutta, Botanical Survey of India, 271pp.

Rana, T.S. & S.A. Ranade (2009). The enigma of monotypic taxa and their taxonomic implications. Current Science 96(2): 219–229.

Razi, B.A. (1952). Some aspects of vegetation of Poona and neighbouring districts. Journal of Poona University (Science & Technology) 1(2): 1–57.

Santapau, H. (1951). A contribution to the flora of Simhagad Hill, Poona District. Poona Agricultural College Magazine 41(4): 270–284.

Santapau, H. (1957). The Flora of Purandar. Oxford University Press, New Delhi.

Santapau, H. (1967). The Flora of Khandala on the Western Ghats of India Records of the Botanical Survey of India. Vol. XVI, No.1. Botanical Survey of India, Calcutta.

Singh, N.P. & S. Karthikeyan (ed.). (2000). Flora of Maharashtra State (Dicotyledones). Volume 1. Botanical Survey of India, Calcutta.

Singh, N.P & S. Karthikeyan (Eds.) (2001). Flora of Maharashtra State (Dicotyledones). Volume 2. Botanical Survey of India, Calcutta.

Singh, P., K. Karthigeyan, P. Lakshminarasimhan & S.S. Dash (2015). Endemic Vascular Plants of India. Botanical Survey of India Kolkata.

Tetali, P., S. Tetali, B.G. Kulkarni, P.V. Prasanna, P. Lakshminarasimhan, M. Lale, M.S. Kumbhojkar, D.K. Kulkarni & A.P. Jagtap (2000). Endemic Plants of India (A status report of Maharashtra State). Naoroji Godrej Centre for Plant Research, Shindewadi, Satara, India

The International Plant Name Index (2012). Published on the Internet http://www.ipni.org (accessed at 12 December 2016).

Vartak, V.D. (1953). Contribution to the Flora of Torna Hill, Poona District. Journal of Poona University (Science and Technology) 1 (4): 1–10.

Vartak, V.D. (1960). The study of the Flora of the Katraj Ghat. Journal of Poona University (Science & Technology) 22: 85---–117.

Vartak, V.D. (1965). Contributions to the Flora of Raigad Hill, Kolaba District, Maharashtra State. Journal of Poona University (Science &Technology) 30: 19–29.