A. I. BOOK

1. Ravikumar, K and D.K. Ved (Eds.). (Assisted by R. Vijaya Sankar & P.S. Udayan).2000.An Illustrated Field Guide to 100 Red Listed Medicinal Plants of Conservation Concern in Southern India. FRLHT, Bangalore.

2. Udayan, P.S. and Indira Balachandran. 2009. Medicinal Plants of Arya Vaidya Sala Herb Garden, Arya Vaidya Sala, Kottakkal.

3. Krishnakumar N. P.S. Udayan, S.P. Subramani and R. Anandalakshmi. 2013. Flowering plants of the Sholas and Grasslands of the Nilgiris. Institute of Forest Genetics and Tree Breeding (IFGTB), Coimbatore.

A. II. CHAPTER IN BOOK

B. BOOKLETS:

C. PAPERS

1. Udayan, P.S., K. Ravikumar, D.K. Ved and K. Udaiyan. 2007. Fibraurea darshani, a new species of Menispermaceae from South India. Rheedea, 17 (1 & 2): 9-12.

2. Udayan P.S., K.V. Tushar and Satheesh George. 2007. A new variety of Humboldtia (Fabaceae: Caesalpinioideae) from the Western Ghats of India. Jour. Bot. Res. Inst. Texas 1(1): 121-127.

3. Udayan P.S. and A.K. Pradeep. 2009. A new species of Tinospora (Menispermaceae) from South India, Edinburg Journal of Botany, Royal Botanic Garden Edinburgh, UK. 66 (1): 77-80.

4. Ravikumar, K., S.P. Subramani, P.S. Udayan and Mohan Karnat. 2000. Notes on few Rare and Endemic Plants from the Western Ghats of Coorg District, Karnataka. Jour. Econ. Taxon. Bot. 24 (2): 334-338.

5. Udayan, P.S., S. Noorunnisa Begum, Anjana Mudappa and Archana Kumari. 2003. Plant Diversity of Medicinal Plants Conservation Areas located in Karnataka. Jour. Econ. Tax. Bot. 27 (3): 635-639.

11. Satheesh George, Tushar K.V., Udayan P.S. and Balachandran 2006. Seed germination and seedling vigour of Holostemma ada-kodien. Jour. Tropical Medicinal Plants, 7 (1): 83-86.

13. Sudhakar Raja, K.P. Unnikrishnan, Satheesh George, A.B. Remashree, Udayan P.S., Tushar K.V and. Indira Balachandran. 2007. Variation in Vasicine content and Pharmacognostic characters of Morphotypes of Adhatoda zeylanica Medic. Jour. Plant Sciences, 1-8.

14. Udayan, P.S., K.V. Tushar, Satheesh George and Indira Balachandran. 2007. Some Red listed and little known plants from the Top Slip Forest, Western Ghats (Coimbatore District), Tamilnadu, India. Jour. Econ. Taxon. Bot. 31 (3): 27-30.
15. Satheesh George, Unnikrishnan K.P., Udayan P.S., Tushar K.V., Anu Augustine and Indira Balachandran 2007. Morphological and phytochemical characterization of different accessions of Hemidesmus indicus. Jour. Tropical Medicinal Plants, 8 (1): 97-101.
16. Udayan, P.S., K.V. Tushar, Satheesh George and Indira Balachandran. 2008. Notes on few rare, endemic and red listed plants from the Western Ghats of Kakkayamforest, Kozhikode district (Calicut), Kerala, India. Jour. Econ. Taxon. Bot. 32 (3): 581-594.
17. Udayan, P.S., Indira Balachandran and P.N. Ravindran. 2008. Bidaria indica – Rahman & Wilcock– a rare and little known endemic from Nilgiris district of Tamil Nadu, India. Bull. Bot. Surv. India 50 (1-4): 150-151.
18. Satheesh K., Udayan. P.S., N. Anilkumar and Indira Balachandran. 2009. Notes on ten rare, endemic and threatened plants of Western Ghats of conservation concern. Jour. Econ. Taxon. Bot. 33 (1):240-247.

19. Udayan, P.S., Tushar K.V., Satheesh George and Indira Balachandran. 2009. Notes on a few rare, endemic and, red listed plants from Tirumala forest of Tirupati, Chittoor district, Andhra Pradesh. Jour. Econ. Taxon. Bot. 33 (2): 277-284.

20. G.V. Srinivasan, P. Sharanappa, P.S. Udayan, N.K. Leela and K.K. Vijayan. 2010. Chemical composition and antimocrobial activity of the essential oil of Ixora coccinea L. root. Jour. Med. and Aromatic Plant Sciences 32: 27-30.

21. Sadashiva C.T, Sharanappa P., Remashree A.B., Raghu A.V., Udayan P.S., and Indira Balachandran. 2010. Chemical composition and antimicrobial activity in essential oil from bark of Pittosporum dasycaulon Miq. Advances in Biological Research 4(6): 301-304.

22. Udayan P.S., Regy Yohannan, M.S. Devipriya, V. Devipriya and A.K. Pradeep. 2012. A new species of Salacia (Hippocrateaceae) from South India. Edinburgh Jour. Botany 69 (2): 255–258.

23. Udayan P.S. & A.K. Pradeep. 2012. Notes on the occurrence of Salacia reticulata Wight (Hippocrateaceae) in India. Acta Botanica Hungarica. 54 (3-4): 433-441.

24. Rahul R Nair, P.S.Udayan, S. Thilaga, M. Kavitha, R.M. Bharathanandhini, A.M. Nizzy and D. Ganesh. 2012. Molecular distinction of two closely resembling Morinda species using rbcL and matK loci for quality management of Indian herbal medicine. Plant Genetic Resources, Cambridge Univ. Jour 1-4.

25.          Pius. O.L, Sujanapal. P, Varghese. A.O. and Udayan. P.S. 2013. Vegetation characteristics of southern secondary moist Mixed deciduous forests of windward Anamalai’s of Western Ghats, India. International Jour. Integrative sciences, Innovation and Technology 2(3): 42-53.

26.        Robi A.J. and P.S. Udayan. 2013. Actinodaphne shendurunii (Lauraceae): A new species from Southern Western Ghats, India. International Journal Plant, Animal and Environmental Sciences. 3(3): 185-188.

27.      Robi A.J., Jomy Augustin, N. Sasidharan and P.S. Udayan. 2013. Rediscovery of an endemic and rare Premna paucinervis (Verbenaceae) from the Western Ghats after a century. Rheedea 23(1): 10-12.

28.      Punnakkal S. Udayan, Regy Yohannan, Madhavanpillai S. Devipriya, Vijayavalli Devipriya & Ayilliath K. Pradeep 2013. Salacia vellaniana Udayan, Yohannan & Pradeep (Celastraceae), a new species from India. Candollea 68 (1): 147- 149.

29.    Sujanapal P., A.J. Robi, P.S. Udayan and K.J. Dantus 2013. Syzygium sasidharanii sp. nov. (Myrtaceae) – A new species with edible fruits from Agasthyamala Hills of Western Ghats, India. International Jour. Advanced Research 1 (5): 44-48.

30. Anilkumar K.A. 2013. A new species of Clematis L. (Ranunculaceae) from Western Ghats of Kerala, India. International Journal Plant, Animal and Environmental Sciences. 3 (4): 81-85.

31. Anilkumar K.A., M. Prabhukumar and P.S. Udayan. 2013. Caralluma bicolor Ramach. et al., (Apocynaceae, Asclepiadoideae) – A rare and little known endemic plant as a new report from the Western Ghats of Palakkad District, Kerala State, India. Jour. Threatened Taxa. www.threatenedtaxa.org 5 (15): 5007-5009.

32. Anilkumar K.A. and P.S. Udayan. 2013. A new species of Oxalis L. (Oxalidaceae) from Western Ghats of Kerala, India. International Journal of Advanced Research 1 (10): 55-58.

33.  Anilkumar K.A., M. Prabhukumar and P.S. Udayan. 2013. Notes on Justicia notha Clarke (Acanthaceae) – A Critically Endangered and Endemic species from Southern Western Ghats of India. NeBIO International Journal of Environment and Biodiversity. 4(6): 33-35.

34. Udayan P.S., A.J. Robi and K.A. Anilkumar. 2013. Decalepis nervosa (Wight & Arn.) Venter(Apocynaceae, Periplocaceae): a rare and little known endemic plant from Kerala. Nelumbo, 55: 188-190. ISSN 0976 5069, Botanical Survey of India, Calcutta.

35. Robi A.J., P.A. Jose and P. S. Udayan.2014. Thottea sasidharaniana sp. nov. (Aristolochiaceae) from Peninsular India. Nordic Journal of Botany. 31: 001–004.

36. Udayan P. S., A.V. Raghu, V. B. Sreekumar and E.M. Muraleedaran. 2014. A new variety of Salacia (Celastraceae) from the Western Ghats of Kerala, South India. International Journal Plant, Animal and Environmental Sciences. 4 (3): 100-102. ISSN 2231-4490.

37.             A.J. Robi, P. Sujanapal, and P.S. Udayan.Cinnamomum agasthyamalayanum sp. nov. (Lauraceae) from Kerala, India.International Journal of Advanced Research 2 (10): 1012-1016. ISSN 2320-5407.

38.             Udayan, P.S., K. Ravikumar and S. Noorunnisa Begum. 2001. Additions to the flora of Chikmagalur District, Karnataka State. MyForest. 37(1): 325-334.

41. Ravikumar, K. and P.S. Udayan. 2002. Notes on Marsdenia razianaYogan. & Subr., An endemic species to the Western Ghats of Karnataka and Kerala. Zoos’ Print. Journal 17(12): 949-950.

42. Udayan, P.S. and K. Ravikumar 2003. Additions to the Flora of Shimoga District, Karnataka, India. MyForest. 39 (1): 7-18.

43. Udayan, P.S. and K. Ravikumar 2003. Additions to the Flora of Bangalore District, Karnataka, India. MyForest. 39(2): 103-108.

44. Udayan, P.S. and K. Ravikumar. 2003. New Plant Records for Karnataka State. Indian Jour. Forestry. 26(4): 384 -388.

45. Ravikumar, K., P.S. Udayan and S.P. Subramani. 2004. Notes on Distribution ofCapparis rotundifolia Rottler (Capparaceae). The Indian Forester 130 (3): 313-317.

46. Udayan, P.S., K. Ravikumar and K. Udaiyan. 2004. New plant reports to the state of Karnataka. The Indian Forester 130 (5): 551-564.

47. Udayan, P.S., K.V. Tushar, Satheesh George and Indira Balachandran. 2004. Gymnema khandalense Santapau – A rare and little known endemic red listed medicinal plant from Nilakkal forest, near Sabarimala (Western Ghats), Patthanamthitta district of Kerala. Zoos’ Print, Journal 19 (9): 1622-1623.

48. Udayan, P.S., Satheesh George, K.V. Tushar and Indira Balachandran. 2004. Tinospora sinensis (Lour.) Merr. – A New Report to the State of Tamil Nadu from Sickupara, Kolli Hills Forest, Namakkal District. Zoos’ Print, Journal 19 (9): 1623-1624.

49. Udayan, P.S. 2004. A new location for Madhuca insignis (Radlk.) H.J. Lam.-A rare, endemic and red listed plant near Venur of Dakshina Kannada District, Karnataka.. Silviculturist, (4) 295.

50. Udayan, P.S., K.V. Tushar and Satheesh George. 2004. Notes on Rare, Endemic, Red Listed plants as additions to The Flora of Cannanore district (Kannur), Kerala state. Indian Jour. Forestry. 27 (4): 341-346.

51. Udayan, P.S., K.V. Tushar, Satheesh George, and Indira Balachandran. 2004. Some common medicinal plants used by the Kuruba community of Thamadihalli forest near Tiptur, Tumkur District, Karnataka, India. Jour. Non Timber Forest Products. 11 (3): 215-219.

52. Udayan, P.S., Satheesh George, K.V. Tushar and Indira Balachandran. 2005. Some common Medicinal plants used by the Nayaka community, Savandurga Forest of Magadi Taluk, Bangalore Rural district, Karnataka, India. Natural Remedies 5 (1): 35-40.

53. Udayan, P.S., Satheesh George, K.V. Tushar and Indira Balachandran. 2005. Medicinal Plants used by the Kaadar Tribes of Sholayar forest, Thrissur District, Kerala. Indian Jour. Traditional Knowledge, 4 (2): 159-163.

54. Udayan, P.S., K.V. Tushar, Satheesh George, and Indira Balachandran. 2005.Sauropussaksenianus Manilal et al. – (Euphorbiaceae) a rare and little known endemic plant from Ambayathode forest of Western Ghats, Kannur district, Kerala state, India. Jour. Non Timber Forest Products, 12 (4): 5-17.
55. Udayan, P.S., K.V. Tushar, Satheesh George, and Indira Balachandran. 2005. Ethnomedical information from the Chellipale community near Kolli hills of Namakkal district, Tamil nadu, India. Indian Jour. Traditional Knowledge, 4 (4): 437-442.
56. Udayan, P.S., K.V. Tushar, Satheesh George, A.K. Pradeep and Indira Balachandran. 2005. Phyllanthus kozhikodianus Sivar. & Mani. (Euphorbiaceae) – A new record for the state of Tamilnadu, India, Zoo’s print Journal. 20 (6): 1904.
57. Udayan, P.S., Satheesh George, K.V. Tushar and Indira Balachandran. 2006. Medicinal Plants used by the Malayali tribe of Sevarayan hills, Yercad, Salem district, Tamil Nadu, India. Zoos print Journal. 21 (4): 2223-2224.
58. Udayan P.S., Tushar K.V., Satheesh George and Indira Balachandran. 2006. Phyllanthus kozhikodianus Sivar. & Mani. (Euphorbiaceae) – A new record for the state of Andhra Pradesh, India. Zoos Print Journal, 21 (4): 2259-2260.
59.  Udayan, P.S. 2006. Notes on Few Rare, Endemic and Endangered Plants from Mannavanshola, High range, Munnar, Idukki district, Kerala. The Indian Forester, 132 (11): 1453-1464.
60.  Udayan P.S., Tushar K.V., Satheesh George, Sudhakar Raja S. and Unnikrishnan K.P. 2006. Notes on some wild edible fruits from the Western Ghats of Nilgiris forests, Tamil Nadu, India Jour. Non Timber Forest Products, 13 (4): 249-259.
61.   Udayan, P.S., Satheesh George and Indira Balachandran. 2006. Heliotropium keralense Sivar. & Manilal – A little known endemic and red listed medicinal plant from Agumbe, Sirsi and Udupi as a new report from the state of Karnataka, India. MyForest, 42 (2): 165-169.
62.  Udayan P.S., Tushar K.V., A.K. Pradeep and Indira Balachandran. 2006. Phyllanthus kozhikodianus Sivar. & Mani. (Euphorbiaceae) – A new record for the state of Karnataka, India. MyForest. 42 (3): 267-271.
63.  Satheesh George, Tushar K.V., Udayan P.S., Sudhakar Raja, Unnikrishnan K.P.,Remashree A.B., Indira Balachandran and P.N. Ravindran. 2006. Morphotypes of Adhatoda zeylanica Medic. Jour. Non-Timber Forest Products, 13 (1): 29-31.
64. Satheesh George, Tushar K.V., Udayan P.S. and Indira Balachandran. 2006. Occurrence of natural shoot proliferation in Justicia gendarussa Burm.f. Jour. Non-Timber Forest Products, 13 (3): 203.
65.  Udayan, P.S. 2007. Seshagiria sahyadrica Ansari et Hemadri (Asclepiadaceae)- A Rare Endemic plant new report for Tamilnadu. The Indian Forester, 133 (4): 581-582.
66. Udayan, P.S., Satheesh George, K.V. Tushar and Indira Balachandran. 2007. Ethnomedical information from the Malapandaram tribes of Achenkovil forest of Kollam district, Kerala, India. Indian Jour. Traditional Knowledge, 6 (4): 569-573.
67. Udayan, P.S., K.V. Tushar, Satheesh George and Indira Balachandran. 2007. Ethnomedicinal information from Kattunayakas tribes of Mudumalai Wildlife Sanctuary, Nilgiris district, Tamil Nadu. Indian Jour. Traditional Knowledge, 6 (4): 574-587.
68. Udayan P.S., Tushar K.V., Sateesh George and Indira Balachandran 2008. Notes on a few rare, endemic and red listed plants from the Western Ghats of Mundanthurai forest, Tirunelveli district, Tamilnadu, India. The Indian Forester. 134 (1): 88-96.
69. Udayan, P.S., M.K. Harinarayanan, K.V. Tushar and Indira Balachandran. 2008. Some common medicinal plants used by the Kurichiar tribes of Tirunelli forest, Wayanad district, Kerala. Indian Jour. Traditional Knowledge, 7 (2): 250-255.
70. Udayan, P.S., Satheesh George, K.V. Tushar and Indira Balachandran. 2008. Rare, endemic and red listed medicinal plants from the Yercaud forests of Salem district, Tamil Nadu, India. Indian Jour. Forestry. 15(2): 103-109.
71. Satheesh K., Udayan. P.S., N. Anilkumar and Indira Balachandran. 2009. A new location for Gymnema khandalense Santapau – a rare and little known endemic red listed medicinal plant from Vavala forest, near Chimmony Dam, (Western Ghats), Thrissur district of Kerala state, India. Jour. Non. Timber Forests Prod., Dehradun.
72. Satheesh K., Udayan. P.S., N. Anilkumar and Indira Balachandran. 2009. A new report for Hydnocarpus macrocarpa (Bedd.) Warb. – A narrow endemic, endangered and red listed plant from 5^th mail, near Neriyamangalam forest of Ernakulam district, Kerala. MyForest, Bangalore.
73. Devipriya MS, Udayan P.S and Devipriya V. 2009. Salacia Linn. – A medicinally valuable genus. Holistic Thought, journal VIII (1-2) 44-46. S.N. College, Kollam.
74. Devipriya M. S., Devipriya V., Udayan P. S., Vijaya Raghava Kumar and Mathew P. M. 2010. Variability and correlation among Quantitative epidermal features of six species of Salacia L. from Kerala. Jour. Cytol. Genet. Vol. II (NS): 1, 35-40.
75. Udayan P.S. and A.J. Robi. 2012. Actinodaphne lawsonii Gamble & Apollonias arnotii Nees (Lauraceae) – A new report to the state of Karnataka. Indian Forester 138 (7): 662-664.
76. Seena Mohan and P.S. Udayan. 2013. Seed germination studies in Ipomoea (Convolvulaceae)- A threatened and commercially important Medicinal plant for conservation. The proceedings of the UGC sponsored national seminar on Western Ghats Biogeography, Biodiversity and Conservation. NSS College, Manjeri. pp. 175-179. ISBN 978-81-926618-0-3
77. Jiji P and P.S. Udayan. 2013. Distribution of a few Rubiaceae in Malappuram, Kozhikkode, Palakkad and Thrissur Districts, Kerala. The proceedings of the UGC sponsored national seminar on Western Ghats Biogeography, Biodiversity and Conservation. NSS College, Manjeri. pp. 204-208. ISBN 978-81-926618-0-3
78. K.A. Anilkumar and P.S. Udayan. 2013. Ethnobotanical information from the Kurumba tribes of Attappady forest of Palakkad District, Kerala, India. The proceedings of the UGC sponsored national seminar on Western Ghats Biogeography, Biodiversity and Conservation. NSS College, Manjeri. pp. 215-221. ISBN 978-81-926618-0-3
79. A.J. Robi and P.S. Udayan. 2013. Taxonomic studies of the genus Litsea Lam. (Lauraceae) in Kerala. The proceedings of the UGC sponsored national seminar on Western Ghats Biogeography, Biodiversity and Conservation. NSS College, Manjeri. pp. 256-263. (ISBN 978-81-926618-0-3)
80. Udayan P.S. and T.K. Sabu. 2014. A herbal Garden of Arya Vaidya Sala, Kerala. Medplant. ENVIS News letter, 7 (1, 2, 3 & 4): 5. ISSN 0974-7354.
81. Seena Mohan and P.S. Udayan. 2014. Seed germination studies of Trichosanthes cucumerina L. (Cucurbitaceae) – A commercially important medicinal plant for conservation. Discourse Xavierian Research Journal 2(2): 35-40.