Heliotropium hookeri (C.B.Clarke) Rueangs. & Chantar., 2023

Rueangsawang, Kanokorn & Chantaranothai, Pranom, 2023, A taxonomic synopsis of Heliotropiaceae and new combinations in Heliotropium from Thailand, PhytoKeys 232, pp. 189-210 : 189

3. Heliotropium hookeri (C.B.Clarke) Rueangs. & Chantar. comb. nov.

Tournefortia hookeri C.B.Clarke, Fl. Brit. India 4: 147. 1883.

Tournefortia viridiflora Gamble, Darjeeling List: 57. 1878. nom.illeg.

Type.

Sikkim, Himalayas, Hooker s.n. (holotype K [K000998133!]).

Distribution.

East Himalaya, Myanmar, Thailand (Fig. 1H ).

Ecology.

Deciduous forest, flowering and fruiting in June.

Specimens examined.

Thailand, Northern: Chiang Mai, Ban Pa Kar, Samoengtai , Samoeng , 1,424 m alt., 26 June 2008, Jatupol 08 - 275 (QBG) .

Diagnostic characters.

Heliotropium hookeri is newly recorded for Thailand due to a specimen of this distinctive species seen from QBG. This species is recognisable in the leaves being broadly ovate with dense golden brown tomentose hairs on the lower surface and loosely dichotomous cymose.

Figures

Figure 1. Distribution of Heliotropiaceae from Thailand, based on the specimens examined.