Taxonomic Study of the Family Acanthaceae Used As Traditional Medicinal Plants for Ethnic Groups in North, Central and Northeastern Thailand
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Taxonomic Study of the Family Acanthaceae used as traditional medicinal plants for ethnic groups in North, Central and Northeastern Thailand. Winai Somprasong1/ Srunya Vjarodaya2/ Kongkanda Chayamarit3/ ABSTRACT The Acanthus Family (Acanthaceae) is one of necessary plants for peoples across several regions in Thailand, especially in terms of traditional medicinal purposes. As mentioned, the case studies in North and Northeastern Thailand are summarized that further our understanding of the close relationships between traditional uses and indigenous people. The study showed that a number of 39 species 1 varieties reported with their uses. The most important ones are enumerated namely, Acanthus ebracteatus Vahl, Acanthus montanus T. Anderson, Andrographis paniculata (Burm.f.) Wall. ex Nees, Barleria lupulina L., Barleria prionitis L., Barleria strigosa Willd., Clinacanthus nutans (Burm.f.) Lindau, Clinacanthus siamensis Brem., Dicliptera roxburghiana Nees, Graptophyllum pictum Griff., Justicia adhatoda L., Justicia diacantha Imlay, Justicia gendarussa Burm.f., Justicia glomerulata Benoist, Justicia procumbens L., Justicia quadrifaria (Wall. ex Nees) T. Anderson, Justicia ventricosa Wall., Nelsonia canescens (Lam.) Spreng., Peristrophe acuminata Nees, Peristrophe lanceolaria (Roxb.) Nees, Phlogacanthus curviflorus Nees, Phlogacanthus pulcherrimus T. Anderson, Rhinacanthus nasutus (L.) Kurz, Pseuderanthemun graciliflorum (Nees) Ridl., Pseuderanthemum palatiferum (Nees) Radlk., Rungia parviflora (Retz.) Nees subsp. pectinata (L.) L.H. Cramer, Sanchezia oblonga Ruiz & Pav., Staurogyne lanceolata (Hassk.) Kuntze, Strobilanthes cusia Nees, Strobilanthes lanceifolius T. Anderson, Strobilanthes nivea Craib., Strobilanthes pentstemonoides (Nees) T. Anderson, Thunbergia coccinea Wall., Thunbergia fragrans Roxb. var. fragrans, Thunbergia grandiflora Roxb., Thunbergia hossei Clarke, Thunbergia laurifolia Lindl., Thunbergia similis Craib, Thunbergia fragrans Roxb. var. vestita Nees. It is 1/ Graduate School, Kasetsart University, 50 Phahon Yothin Rd., Chatuchak, Bangkok 10900 THAILAND, Department of Agriculture, Phahon Yothin Rd., Chatuchak, Bangkok 10900 THAILAND 2/ Faculty of Science, Kasetsart University, 50 Phahonyothin Rd., Chatuchak, Bangkok 10900 THAILAND 3/ Department of National Parks, Wildlife and Plants, Phahon Yothin Rd., Chatuchak, Bangkok 10900 THAILAND Thai Agricultural Research Journal Vol. 32 No. 1 January - April 2014 77 apparent that, across local wisdom and genera treated by Scotland and Vollesen acanthus species are valued for their (2000), classify it into three subfamilies, remedies to common diseases and i.e. Nelsonioideae, Thunbergioideae and discomforts. The research focuses on Acanthoideae. The last one is the largest their wide-ranging significance of subfamily which composts of two tribes, medicinal plants that relate to human i.e. Acantheae and Ruellieae. The latter cultures which provide incentives for tribe, comprising four subtribes and the countries to protect, conserve and sustain selected two of them, subtribe Barleriinae them for agricultural purposes in the and Andrographinae, are interesting to be future. revised for this research, due to their well-known as the Thai medicinal plants Key words : Acanthaceae, traditional used by traditional herbalist. Some well- use, ethnic groups, Thailand known species in tropical zone are Andrographis paniculata Nees and INTRODUCTION Barleria lupulina Lindl. (Khamfachuea, The Family Acanthaceae is a large 2008; Tovaranonte, 1998) pantropical family of about 229 genera Notably, as a result of the largely and 3,450 species in the world (Clarke, tropical distribution of Acanthaceae, 1885). Most of them are herbs or shrubs, species-level diversity remains poorly including twining forms, some are spiny. understood, and there is little doubt that The four main centres of distribution are many new species remain to be Indo-Malaya, Africa, Brazil and Central discovered. In particular, the Neotropics America but a few are in the temperate house the richest and most poorly zone. (Cramer, 1998). The representatives documented angiosperm flora on Earth. It of the family can be found in nearly every is thus not surprising that Neotropical habitat, e.g. in dense or open forest, in acanthus family remains incompletely thickets, on wet fields and valleys, at the known, and it is to be expected many sea coast and in marine areas, swamps more species to be described from this and as an element in swamp forests region. This research aims to clarify the (Benoist, 1936; Imlay, 1938). There were taxonomic revision of the subtribe about 40 genera and over 230 species in Barleriinae, tribe Ruellieae sensu Scotland Thailand and the majority are confined all and Vollesen (2000), Family Acanthaceae, over the country (Hansen, 1985). to study the morphological characters of Acanthaceae was included the 221 the subtribe Barleriinae and 78 วารสารวิชาการเกษตร ปีที่ 32 ฉบับที่ 1 มกราคม - เมษายน 2557 Andrographinae, Family Acanthaceae, to in the Netherlands, and Musum National enumerate the number of species and d’Histoire Naturelle (P), France construct the keys to subtribe, genera (2) Field Survey and Specimens and species and to record the Collection of the subtribe Barleriinae geographical distribution, ecological and (both genera of Barleria L. and phonological information, and uses of Lepidagathis Willd.) and the subtribe some species. Andrographinae (both genera of Andrographis Wall. and Pholgacanthus MATERIALS AND METHODS Nees) are conducted throughout the (1) Taxonomic Treatment was country by choosing from three regions, conducted by means of the literature and e.g. the north (13 ethnic groups): Chiang herbarium specimens studies of the Rai, Chiang Mai, Mae Hong Son and Nan subtribe Barleriinae (both genera of Province; the northeast (7 groups): Nong Barleria L. and Lepidagathis Willd.) and Khai, Bung Kan, Nakhon Phanom and the subtribe Andrographinae (both genera Ubon Ratcha Thani); the central (2 ethnic of Andrographis Wall. and Pholgacanthus groups): Tak, Kam Phaeng Phet, Ratcha Nees) examined at Thai and foreign Buri and Kanchana Buri Province (Figure herbaria as follows: Bangkok Herbarium, 1 and Figure 2) Department of Agriculture (BK), Forest (3) Measurement of vegetative and Herbarium, National Park, Wildlife and reproductive features of dried specimens Plant Conservation Department (BKF), collected by the author, and herbarium Queen Sirikit Botanic Garden Herbarium, specimens deposited in the above Thai The Botanical Organization, Ministry of and foreign herbaria are carried out by Natural Resources and Environment using a hand ruler or scale calibrated in (QBG), the Biological Department cm and mm under the stereomicroscope Hebarium, Chiang Mai University (CMU), for the characters of indumentum, leaves Prince of Songkhla University Herbarium and flowers. To study morphological (PSU), Royal Botanic Gardens, Kew (K), characters clearly, the specimens should Royal Botanic Gardens, Edinburgh (E), be usually boiled at 60-80 degree Celsius and The Natural History Museum (BM) in to be more softer. Illustrations and the UK, Department of Systematic Botany, photographs are provided for clarification. University of Aarhus (AAU) and Botanical The herbarium specimens together with Museum, University of Copenhagen (C) in the voucher specimens are identified by Denmark, National Herbarium, Leiden (L) taxonomic literature and the comparison Thai Agricultural Research Journal Vol. 32 No. 1 January - April 2014 79 with the type specimens. Preparation the neighbouring countries. The identifications keys to subtribe, genera based on the are confirmed with the type specimens. significant morphological characters are constructed to prove their taxonomic RESULTS AND DISCUSSIONS units. The dried specimens are mounted The study on the family Acanthaceae on herbarium sheets with the label and among ethnic groups in Thailand (north registered for keeping in the main Thai Chiang Rai, Chiang Mai, Mae Hong Son herbaria such as BK, BKF, QBG, PSU, and Nan Province; Northeast: Nong Khai, CMU, and K respectively. This present Bung Kan, Nakhon Phanom and Ubon revision is based mainly on the study of Ratcha Thani; Central: Tak, Kam Phaeng herbarium material at BK, BKF, CMU, Phet, Ratcha Buri and Kanchana Buri PSU, QBG and K (herbarium codes Province) (Figure 1 and Figure 2) during following Thiers, 2012). The work was October, 2009 to September, 2010. undertaken between June 2008 and The study on the family March 2012. Morphological characters Acanthaceae was diagnosed through and measurements were taken directly details of corolla aestivation, cystolith, from living or dried herbarium specimens. retinaula, number of stamen and seed Vegetative and reproductive parts were data to serve the classification of this measured using an Olympus SZX9 family. Benoist, 1936; Cramer, 1998; The stereomicroscope; up to 5 representative classification of Acanthaceae followed by specimens of each species were Scotland & Vollesen (2000) which are measured to cover their variation. classified it into three subfamilies, Ecological and distribution data were also i.e. Nelsonioideae, Thunbergioideae recorded. In addition, photographs of Acanthoideae (Figure 3). The last one is living specimens were taken during the the largest subfamily which comprises field expeditions. Distribution maps were two tribes, i.e. Acantheae and Ruellieae. recorded from herbarium materials and The tribe Ruellieae was classified into 4 field expeditions.