สำนักงานราชบัณทิตยสภา

The Journal of the Royal Institute of Thailand Volume IV - 2012 52  Soi Suwanna is widely distributed in India, China, Taiwan, Japan, Southeast Asia and North Australia. In Thailand it is found scattered all over the country in moist to wet sandy, peaty-like substrate that is associated with soils or sediments derived from sandstone rocks. It is more gregarious in extensive patches in open wet grassy grounds on the fl at sandstone rock formation in deciduous dipterocarp forest of the Korat plateau at elevations between 200 and 500 m, and up to ca.1300 m in the fl at-topped sandstone mountains of Phu Kradueng and Phu Luang in Loei Province. Thip Kesorn ( ทิพเกสร )- Utricularia minutissima Vahl (Lentibulariaceae) A small, terrestrial, carnivorous, annual herb, 5-12 cm tall, without true roots. Stems modi fi ed into capillary stolons and rhizoids. Stolons few. Rhizoids few, short, unbranched. Traps or digestive bladders numerous, minute, stalked, ovoid, mostly on stolons and leaves. Leaves few from peduncle bases and stolons, absent at fl owering; leaf blade membranous, narrowly linear, 0.6-2.5 cm long, base tapering onto petiole, apex obtuse. In fl orescence solitary, erect, 4-8 cm long, 1-6- fl owered; fl owers widely spaced. Bracts narrowly ovate, at the base. Bracteoles similar but narrower. Flowers pale purplish-pink or white, 5-8 mm long, on erect fl owering stalk. Sepals fused, 2-lobed, lobes equal. Petals fused, 2-lipped; upper lip very much smaller than lower lip, palate yellow, throat white; spur 2-3 mm long, pointing downwards, slightly longer than lower lip, straight; lower lip spreading; Stamens 2, at base of corolla tube, included. Carpels 2, connate into 1-locular, superior ovary. Fruit obliquely ellipsoid capsule, dehiscent. Thip Kesorn is widespread from India, China, South Japan, Southeast Asia to North Australia. In Thailand it is sporadically found all over the country. It grows in wet sandy soil in open grassy places and wet sandstone terrain at low elevations. In northeastern Thailand, the plant grows on the wet grassy ground fl oor of deciduous dipterocarp forest in association with Dusita, Soi Suwanna, Sarassa Chandhorn, and Manee Dheva . Flowering is mainly from October to December. Her Majesty Queen Sirikit and the Conservation of the Wild Flower Fields in Northeastern Thailand