Taxonomy of Thai Boraginaceae · The taxonomy of the Thai Boraginaceae has been revised for the...
Transcript of Taxonomy of Thai Boraginaceae · The taxonomy of the Thai Boraginaceae has been revised for the...
Kanokorn Rueangsawang & Pranom ChantaranothaiApplied Taxonomic Research Center, Department of Biology,
Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
Acknowledgements The author thanks the curators and staff for their facilities, Mr P. Polsena for the photos. This work was supported by the TRF/BIOTEC Special Program for Biodiversity Research and Training, grant BRT R_151001 and the Applied Taxonomic Research Center, Khon Kaen University.
INTRODUCTION
References Airy Shaw, H.K. 1973. A dictionary of the flowering plants and ferns, 8th . Cambridge University Press.
De Jussieu, A.L., 1789. Genera Plantarum. Herissant & Barrois, Paris Diane, N, Forther, H. and Hilger, H.H. 2002. A systematic analysis of Heliotropium, Tournefortia and allied taxa of the Heliotropiaceae (Boraginales) based on ITS1 sequences and morphological data. American Journal of Botany 89: 287-295. Heywood, V.H., Brummitt, R.K, Culham, A. and Seberg, O. 2007. Flowering Plant Families of the World. Oxford University Press.Hutchinson, J. 1969. Evolution and phylogeny of flowering plants. Academic Press, London. Reidl, H. 1997. Boraginaceae. Flora Malesiana, Series I, 13: 43-144.Ruengsawang, K. & Chantaranothai, P. 2009. A revision of Boraginaceae subfamily Boraginoideae in Thailand. Thai Journal of Botany 1(2): 29-41. Schrader, H.A. 1819. Commentations societatis regiae scientiarum gottingensis recentiores 4: 192.
The taxonomy of the Thai Boraginaceae has been revised for the flora of Thailand. A total of 12 genera are recognized
comprising 41 species. The genus Argusia, Carmona, Coldenia, Maharanga, Onosma and Rotula are represented by one species each. Twelve species are enumerated in Cordia, three in Cynoglossum, five in Ehretia, seven in Heliotropium, and four species each in Tournefortia and Trichodesma. Two species, Maharanga lycopsioides and Onosma burmanica are categorised as rare species restricted on limestone mountains in northern Thailand.
Thai BoraginaceaeTaxonomy of
Heliotropium
Cynoglossum
Maharanga Onosma
Trichodesma
Cordia
Tournefortia
Carmona
ColdeniaEhretia
Rotula
Boraginoideae
Argusia
12
6
64
3
6
2
6 3
6
2
1 2
2
style gynobasic
style terminal
style bifid
style twice
style simple
fruit a drupe
fruit of nutlet
= habit
= inflorescence
= flower
= stamens
= style
= fruit6
5
4
3
2
1
Figure 2. Interrelationships of genera in Thai Boraginaceae.
Similar in
Delimitation of Boraginaceae
Figures 1. Boraginaceae in Thailand.
In 1789 Antonine Laurent de Jussieu published a plant
classification system, Genera plantarum. He classified 28
genera into three different groups based on the following
characteristics; berry-like fruits, one or two-locular capsules
and four separate nutlets. In 1819 Schrader established a
segregate family Heliotropiaceae including the genera
Heliotropium and Tournefortia. Further, Airy Shaw (1973)
divided the family Boraginaceae into Heliotropioideae and
Boraginoideae and accepted a separate family, Ehretiaceae.
Many authors such as Hutchinson (1969), Heywood (1993) and
Riedl (1997) regard as separate families. Diane et al. (2002)
accepted Heliotropiaceae as a separate family based on
molecular and morphological study.
The present study, Boraginaceae in Thailand is regarded as
a family consisting of four subfamilies and 12 genera based
mainly on gynoecium characters; Cordioideae (Cordia L.),
Ehretioideae (Carmona Cav., Coldenia L., Ehretia P. Browne,
Rotula Lour.), Heliotropioideae (Heliotropium L. and
Tournefortia L.) and Boraginoideae (Cynoglossum L.
Maharanga A. DC., Onosma L. and Trichodesma R. Br.)
(Ruengsawang & Chantaranothai, 2009).
Sunday, December 11, 2011