NEW SPECIES, NEW COMBINATIONS, AND NEW RECORDS IN CONVOLVULACEAE FOR THE FLORA OF THAILAND
I. Cuscuta japonica Choisy in Zoll., Syst. Verz. Ind. Archip. 130, 184. 1854; Gagnep. & Courchet in H.Lecomte, Fl. Indo-Chine. 4: 312. 1915; R.C.Fang et al. in Wu & Raven, Fl. China 16: 323. 1995.
This is the first record of C. japonica in Thailand. One of the specimens had been misidentified as Cassytha filiformis L. (Lauraceae).
Thailand.— NORTHERN: Chiang Mai [Maerim Distr., Pongyaeng, open area on fence in village, ca 500 m, 20 Oct. 1995, Pooma 1163 (BKF)]; Phitsanulok [Nakhonthai Distr., Ban Yaeng, on shrubs in open area by stream, ca 350 m, 26 Dec. 2000, Wongprasert et al. 0012– 24 (BKF)].
Dichondra micrantha Urb., Symb.Ant. 9: 243. 1924; Tharp & M.C.Johnst., Brittonia 13:
1961; D.F.Austin, Econ. Bot. 52: 88–106. 1998.
This is the first report for this pantropical weed in Thailand. It is noteworthy that the specimen was collected some distance away from urban or agricultural areas, in a rather remote hill tribe village. It should be sought elsewhere in the Kingdom, as it is very likely more widespread than the single collection would suggest.
Thailand.— NORTHERN: Chiang Mai [Sameung Distr., Mae Kan (Karen) village, in medicinal plant nursery, located in degraded, fire-damaged, seasonally deciduous hardwood and bamboo forest, 675 m, Oct., Chiapisit 53 (CMU)].
Ipomoea wangii C.Y.Wu,Yunnan Trop. Subtrop. Flor. Res. Rep. 1: 118. pl. 35, fig. 2. 1965;
C.Fang & Staples in C.Y.Wu & Raven, Fl. China 16: 309. 1995; Staples et al., Thai For. Bull.
(Bot.) 33: 179. 2005. Type. China.Yunnan, Jenn-yeh Hsien, Meng-la, Nov. 1936, C.W. Wang 80769 (holotype KUN!; iso A!).
This species was listed for Thailand without comment in the checklist of species that brought together relevant literature and distribution reports for the Kingdom (Staples et al. 2005). At that time, one of us (GS) had seen only a single specimen that appeared, based on the very large sepals, to be I. wangii, a species previously known only from the type locality in Yunnan, China. The identification was considered provisional at best. However in the course of writing this paper the second author (PT) produced a number of collections made during her M.Sc. research and among them was a fine collection, with flowers and fruits, that matches well with the type of I. wangii. A few additional specimens have been seen from Myanmar, and those are enumerated here to flesh out the scanty knowledge of this species.
Thailand.— NORTHERN: Phitsanulok [Phu Hin Rong Khla National Park, 1250 m, 14 Sept. 2002, Traiperm s.n. (BCU, BKF)]; SOUTHWESTERN: Phetchaburi [Kaeng Krachan National Park, ca Km 36 along road to Thor Thip Waterfall, 650–800 m, 4 Dec. 1993, Larsen et al. 45017 (AAU)]. Myanmar.— Tenasserim Division [Tavoy Distr., in hills W of Paungdaw power station by river, 650 m [2100 ft], Sept. 1961, Keenan et al. 1514 (A, E, K), same locality, Oct. 1961, Keenan et al. 1694 (A, E, K, RAF)]; Kayen [=Karen] State [Myawaddi to Kawkareik Hills, Dec. 1920, Rock 699 (US)].