Over the past century, biodiversity across the globe has been subjected to extreme pressure due to habitat change, over – exploitation, invasion by alien species and more importantly climate change and pollution. According to Gadgil (1996), only 2, 50, 000 plant species are known out of estimated 13.6 million species of plants and animals. Among these only few is very well studied due to its importance to humans, and the remaining species are growing wild in different parts of the world.
More than fifty percent of the world’s tropical trees have been cut down in the past fifty years. With continued habitat loss, and mass extinction, many believe that already the damage is too harsh to repair. Still, although there are only approximately 250,000 to 400,000 species of flowering plants and trees remaining on earth and under the sea, they still hold an enormous library of nature’s technologies.
There are no globally agreed definitions for a ‘tree’. We use the same word to refer to the smallest tree in the world Salix herbaceae L., and to its counterpart Sequoidendron giganteum Lindl. J. Buchholz, the most voluminous living tree.
For ease of classification, scientists have been tried to narrow down the concept of a ‘tree’. According to Mora 2005, “Forest trees are woody plants that have a well-developed stem and usually are more than twelve feet in height, at maturity”. To horticulturists, a ‘Tree’ is defined as having a single stem, more than twenty feet tall, which branches at some distance above ground, whereas, a shrub has multiple stem from the ground, and is less than twenty feet tall. This is a convenient for those writing tree identification books, who wish to limit the number of species they must include.
Floristic inventory and diversity assessments are necessary to understand the present diversity status and conservation of forest, plane and coastal biodiversity. Although inventory and diversity studies are taken up at different levels all over the world by various research groups with available resources and to fill the gap in the biodiversity knowledge, there are variations in sampling methods/techniques, which are being followed in floristic inventory and diversity measurements.
Natural resources survey like floristic study play an important role in the economic development of developing country like India. Vegetation is the most precious gift, nature has provided to us as meeting all kinds of essential requirements of the humans in the form of food, fodder, fuel, medicine, timber, resins and oil etc. Plants communities play a pivotal role in sustainable management by maintain biodiversity and conserving the environment. Rapid industrialization and its attendant pollution and over-exploitation of raw plant materials are some of the causes for the disappearance of the many plants.
Floristic study and diversity assessments are necessary to understand the present diversity status and conservation of biodiversity. Floristic study is a necessary prerequisite for much fundamental research in tropical community ecology, such as modelling patterns of species diversity or understanding species distributions. Floristic studies acquire increasing importance in recent years in response to the need of developing and under developing countries to assess their plant wealth. Many floristic diversity studies have been conducted in different parts of world. Thus, it is clear that floristic studies are undertaken by many researchers worldwide in different levels.
Intensive plant explorations of any region are prerequisites for a detailed botanical account of that region. The urgent need that compel for detailed botanical account of several regions all over the world, in general are mainly due to the alarming rate at which several of the plant are vanishing from many region of the earth. Much of our valuable biodiversity is likely to be lost before it is properly documented.

Plants have always been useful to man. The need for economic surveys of the natural resources is often emphasized for a proper utilization of raw materials in a developing country like India. It is essential to prepare local floras of urban areas where there is severe threat to natural vegetation due to biotic interference and pollution. The present study area of Kerala Raj Bhavan, is selected for the tree floristic studies because it has not been given attention to its vegetation. The knowledge of the plant community is a prerequisite to understand the overall structure and function of ecosystem.
The tree floristic study of Kerala Raj Bhavan, is a representative of the flora of the plains of Thiruvanathapuram district. Most of the floristic documentation done in forest and ignored the vegetation of the plains. Population explosion, urbanization, industrialization etc. is leads to the destruction of several plants in the plains. The present study was undertaken to project the plant wealth to guide the students of botany and research workers in various other fields of botany, and druggists and pharmacists for correct identification and current names of plants in the area. Finally to provide a typical representative floristic documentation of Kerala Raj Bhavan, Thiruvananthapuram.

Kerala Raj Bhavan
Kerala Raj Bhavan is the official residence of the Governor of Kerala. It is situated a little away from the bustle of the city, near Vellayambalam Junction on the Kowdiar road, Thiruvananthapuram. This 12 hectare stretch of lush greenery is sylvan sanctuary for birds, where dignitaries, national as well as international, find a true home away from home. Kerala Raj Bhavan stands within handshake distance from the Kowdiar Palace, from where the Maharajah of Travancore once ruled and where his descendants still live.
When the State of Kerala was born in 1956, there were three Raj Bhavans – the State Government Guest House at Trivandrum, the Bolghatty Palace at Ernakulam, and the Palace at Devicolam, which was the summer resort of the Governor. Later on, the Bolghatty Palace and the Devicolam Palace were transferred to the Public Works Department and the Tourism Department respectively.
Originally built as the Guest House of Travancore State, the oldest building in the Raj Bhavan compound could not accommodate the guests and the various offices of the Kerala Raj Bhavan.  So extensions and additions to the mother building were made.        Built in the Kerala traditional style, the main building of the Raj Bhavan has certain architectural features such as high ceiled, spacious rooms with large windows and doors, with a tinge of Victorian finish. Constructed atop a breezy hillock, it is surrounded by sprawling meadows, velvety lawns, green houses with many species of Anthurium, Orchid, etc.  There is also an enchanting fountain at the centre of the main lawn facing the office room of the Governor.   
With an area of 3.24 hectares, Raj Bhavan Gardens is the centre of attraction to the visitors.The trimmed grass gives the lawn a look of a green carpet spread out, and the artificial water fall, and the three greenhouses add to the charm of the gardens. The beautiful statues brought in from Mayiladi,   
near Sucheendram, Tamil Nadu and placed at appropriate points contribute to the charm of the Kerala Raj Bhavan Gardens. There are also two impressive Band Stands built in regal style, besides a Children's Park, Tennis Court and a Shuttle Court on the premise.
Also situated in the campus are the 71 Quarters for the Officers and Staff of Kerala Raj Bhavan, Raj Bhavan Dispensary, Office of the Electrical Wing and the Raj Bhavan Employees Co-operative Society. There is a post office exclusively for Raj Bhavan named “The Kerala Governor’s Camp Post Office”, where there are facilities for sending speed post, telegrams etc.     
About a few kilometers from the Raj Bhavan is the Museum Complex, consisting of the Napier Museum, Sree Chithra Art Gallery, Zoological park; Kanakakkunnu Palace and Nishagandhi auditorium, Science and Technology Museum, Priyadarshini Planetarium and Biotechnology Museum, Sree Padmanabha Swamy Temple, The Government Secretariat etc.       
Digitization of Flora through QR Code method

QR codes or Quick-Response Codes are easily readable two-dimensional barcodes that when scanned with a QR decoder can translate the code into a URL (Uniform Resource Locator). It allows to encode over 4000 characters in a two dimensional barcode. Popularity of QR codes has increased exponentially now a day with the technological advancement.
QR linking is an emerging field of barcoding; however the best way to link specimens to databases and other materials is still under discussion. Some other options include Unique Specimen Identifiers (USI), Globally Unique Identifiers (GUIDs) and Life Science Identifiers (LSIDs). Currently one of the most frequently used methods is Barcoding. This method was implemented in biological collections in the 1990s at INBio and the Smithsonian Institution (Janzen 1992, Thompson 1994). QR codes were originally invented in 1994 by a Toyota subsidiary Denso Wave Incorporated, in order for storing more information.
QR codes have nine standard features (Denso Wave Incorporated 2013):

1. Capacity to handle different types of data: numeric and alphabetic characters, Kanji, Hiragana, Katakana, symbols, binary and control codes.
2. Large capacity: up to 7,089 numeric and 4,296 alphanumeric characters can be encoded (hundreds of times more than in a barcode).
3. Small printout size: the same information can be encoded in a QR code one-tenth smaller than a barcode.
4. High speed scan: omni-directionally readable, with position detection patterns circumventing the negative effects of background interference.
5. Universal standardization: AIM International Standard, Japanese Industrial Standard and ISO International Standard (ISO/IEC18004).
6. Dirt and damage error correction: QR codes allow a maximum of 30% of damage without losing information.
7. Compartmentalization: QR codes can be divided into multiple data areas (as many as 16), allowing smaller printouts.
8. Flexible representation: shapes and colours of modules can be changed, even allowing for artistic representations (QR code Art).
9. Readability: QR codes can be read by any Smartphone, tablet or laptop with a camera, using freely available software.
QR code linking have immense applications in various fields like commercial tracking, transport and entertainment ticketing, visa and passport information, libraries, education etc.
Website was created as a Blog through Google Blogger (www.blogger.com). QR codes for each plant species were created using authenticated software like www.qrstuff.com. Any person who are interested in Trees of Kerala Raj Bhavan can assess the blog freely; with website link - https://tressofkeralarajbhavan. blogspot.com/. In blog each plant species were recorded in separate pages with unique URL. QR code for each plant species was generated by linking the specific URL, with the help of online software QRStuff.com.