Euploca Nutt., 1836

Feuillet, Christian, 2016, Two new combinations in Euploca Nutt. (Heliotropiaceae, Boraginales) and a conspectus of the species of the Guiana Shield area, PhytoKeys 61, pp. 101-124 : 102

Euploca Nutt., 1836

Euploca Nutt., Trans. Amer. Phil. Soc., ser. 2, 5: 189. 1836.

Heliotropium [unranked] Orthostachys R.Br., Prodr.: 493. 1810. Type species. Heliotropium foliatum R.Br. (lectotype designated by Johnston 1928, pg. 46) [= Euploca foliata (R.Br.) Feuillet, PhytoKeys 61: 103. 2016.].

Preslaea Mart., Nov. Gen. Sp. 2: 75, t. 164. 1827; non Preslia Opiz 1824 ( LAMIACEAE ). Type species. Preslaea paradoxa Mart. [= Euploca paradoxa (Mart.) J.I.M.Melo & Semir].

Orthostachys (R.Br.) Spach, Hist. Nat. Vég. 9: 32. 1838. [ “1840” see Stafleu and Cowan (1985: TL2 vol. 5: 767)] Type species. Based on Heliotropium [unranked] Orthostachys R.Br.

Heliotropium sect. Orthostachys (R.Br.) G.Don, Gen. Syst. 4: 361. 1838. Type species. Based on Heliotropium [unranked] Orthostachys R.Br.

Schleidenia Endl., Gen. Pl. 646. 1839. Type species. Based on Preslaea Mart.

Heliotropium subgen. Orthostachys (R.Br.) Rchb., Deut. Bot. Herb.-Buch: 112. 1841. Type species. Based on Heliotropium [unranked] Orthostachy s R.Br.

Heliotropium sect. Euploca (Nutt.) A.Gray, Proc. Amer. Acad. Arts 10: 49. 1874. Type species. Based on Euploca Nutt.

Heliotropium sect. Orthostachys subsect. Axillaria I.M.Johnst., Contr. Gray Herb. 81: 47. 1928. Type species. Heliotropium paradoxum (Mart.) Gürke, in Engl. and Prantl, Nat. Pflanzenfam. 4(3a): 97. 1893; non Vatke 1875. (lectotype designated by Förther 1998, pg. 135) [= Euploca paradoxa (Mart.) J.I.M.Melo & Semir].

Heliotropium sect. Orthostachys subsect. Bracteata I.M.Johnst., Contr. Gray Herb. 81: 47. 1928. Type species. Heliotropium bracteatum R.Br., Prodr.: 493. 1810.

Heliotropium sect. Orthostachys subsect. Ebracteata I.M.Johnst., Contr. Gray Herb. 81: 47. 1928. Type species. Heliotropium procumbens Mill., Gard. dict.. ed. 8: 10. 1768; non Kunth 1818. [= Euploca procumbens (Mill.) Diane & Hilger].

Hilgeria Förther, Sendtnera 5: 132. 1998. Type species. Hilgeria hypogaea (Urb. & Ekman 1929: 105) Förther [= Euploca hypogaea (Urb. & Ekman) Diane & Hilger].

Type species.

Euploca convolvulacea Nutt.

Description.

Herbs or subshrubs. Leaves alternate, simple, entire. Trichomes on a pedestal of distinctly enlarged foliar epidermis cells. Inflorescences of single, scorpioid cymes, or flowers solitary. Flowers perfect; calyx 5-toothed or 5-lobed, persistent; corolla white, small, 5-merous, lobe’s margin involute; stamens 5, included; nectar disc at the base of the ovary; ovary functionally 4-locular, locules 1-seeded, style terminal, undivided, or absent, the stigma cryptically or clearly apically 2- or 4-fid. Fruit a schizocarp, lobed or unlobed, dry, 2-4 bony 1-seeded nutlets, embryos curved.

Distribution.

North America to Argentina, Africa, Arabian Peninsula to Indochina, Australia.