Euploca ovalifolia (Forssk.) Diane & Hilger, Bot. Jahrb. Syst. 125(1): 48. 2003.
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publication ID |
https://dx.doi.org/10.3897/phytokeys.232.103647 |
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persistent identifier |
https://treatment.plazi.org/id/DA33899F-5A9B-5CFF-B5EE-E900BE173F30 |
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scientific name |
Euploca ovalifolia (Forssk.) Diane & Hilger, Bot. Jahrb. Syst. 125(1): 48. 2003. |
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3. Euploca ovalifolia (Forssk.) Diane & Hilger, Bot. Jahrb. Syst. 125(1): 48. 2003. View in CoL View at ENA
Fig. 2C-E View Figure 2
Heliotropium ovalifolium Forssk., Fl. Aegypt.-Arab.: 38. 1775. Type: Yemen, Al-Hadiyah [ Hadïe], Forsskål, 299 (holotype C [C10002362!], isotype BM [BM000795522!]).
Heliotropium coromandelianum J. Köenig ex Retz., Observ. Bot. 2: 9. 1781. Type: India, Köenig s.n. (holotype C [C10008743!]; isotype BM [BM000795508!]).
Heliotropium gracile R.Br., Prodr. Fl. Nov. Holland.: 493. 1810.
Heliotropium ovalifolium ver. Heliotropium gracile (R.Br.) Domin, Biblioth. Bot. 22(89): 546. 1928. Type: Australia, Northern Territory, North Island, 19 Dec 1802, Brown 2924 (lectotype, designated by Craven 1996, p. 559: BM [BM001040588!]; isolectotypes: K [K000998264!, K000998263!] GH [GH00097831]).
Type.
Based on Heliotropium ovalifolium Forssk.
Distribution.
Tropical Africa, Madagascar, Arabian Peninsula, Pakistan, India, Laos, Cambodia, Vietnam, Thailand (Fig. 1C View Figure 1 ), Australia, Solomon Islands.
Ecology.
Open area, sandy soil on riverbanks, rice fields, grassland, along roadsides; ca. 200 m alt., flowering and fruiting from December to May.
Specimens examined.
Thailand, Northern: Lamphun, Mae Ping NP, 22 May 2019, Thammarong et al. 673 (QBG); Tak, Tha Song Yang-Mae Sa Riang, Moei river , 22 Mar 2006, Pooma et al. 6220 (BKF, L); Bhumibol Dam, 200 m alt., 29 May 2008, Pooma et al. 7073 (BKF); Ban Maesong, 23 June 2005, Pooma et al. 5443 (BKF); Mae Sa Riang-Mae Sot road, 15 May 2007, Pooma et al. 6786 (BKF, E) .
Vernacular.
Nguang chang dok khao (งวงช้างดอกขาว).
Diagnostic characters.
Euploca ovalifolia is newly recorded for Thailand. It is recognised by elliptic to obovate or oblanceolate leaves with silky silver hairs, spike-like or scorpioid cymes inflorescence with pedicels up to 2 cm long and a white corolla with a yellowish to yellow centre. This species is similar to Heliotropium indicum in its inflorescence form, but differs in its leaf shape, bracteate inflorescences (vs. ebracteate in H. indicum ) and fruit breaking up into four nutlets (vs. breaking up into two nutlets in H. indicum ).
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