Ipomoea argyreia (Choisy) Meisn. in Martius et al.

Wood, John R. I., Munoz-Rodriguez, Pablo, Williams, Bethany R. M. & Scotland, Robert W., 2020, A foundation monograph of Ipomoea (Convolvulaceae) in the New World, PhytoKeys 143, pp. 1-823 : 1

38. Ipomoea argyreia (Choisy) Meisn. in Martius et al. , Fl. Brasil. 7: 246. 1869. (Meisner 1869: 246)

Rivea argyreia Choisy in A.P. de Candolle , Prodr. 9: 327. 1845. (Choisy 1845: 327). Type. BRAZIL. J.B. Pohl s.n. (lectotype BR00005792573, designated here; isolectotypes BR, K, M).

Ipomoea argyreia var. burchellii Hassl. , Repert. Spec. Nov. Regni Veg. 9: 196. 1911. (Hassler 1911: 196). Type. BRAZIL. W.J. Burchell 6700-9 (lectotype BR00005792214, designated here).

Type.

Based on Rivea argyreia Choisy

Description.

Erect subshrub to 1.5 m of grey appearance, stem woody, white-villous above, pubescent below. Leaves sessile, numerous, imbricate, sometimes appearing opposite or verticillate, 2.5-6 × 0.5-2 cm, oblong to oblanceolate, base cuneate, apex acute and mucronate, adaxially minutely tomentellous, abaxially shortly silvery-grey tomentellous. Flowers aggregated above into a terminal racemose inflorescence simple or branched, 5-15 cm long, flowers solitary or in few-flowered pedunculate cymes, peduncles 0.5-2 cm long, tomentellous; bracteoles 4-6 mm, ovate, acute, deciduous; pedicels 3-6 mm, grey-tomentellous; sepals nearly equal, 7-8 × 3-6 mm, ovate to elliptic, grey-tomentellous, inner sepals similar but with broad scarious margins; corolla 3-3.5 cm long, funnel-shaped, pubescent, limb lobed, c. 2 cm diam. Capsules ovoid, 5-9 mm long, glabrous, shortly rostrate; seeds c. 5 × 2.5 mm, black with long silky marginal hairs.

Illustration.

Figure 6A .

Distribution.

Almost endemic to the Distrito Federal and Goiás State in Brazil. It appears to grow always in campo rupestre from around 800 m to over 1100 m. It is recorded from Mato Grosso in Flora do Brasil 2020 under construction but we have seen no specimen.

BRAZIL. Dist. Fed.: 4 km W of Rio Preto G. Kirkbride 7383a (FTG). Goiás: 7-20 km E of Pireopolis. Serra de Pireneus, M.M. Arbo et al. 3793 (CTES, FTG); 35 km N of Formosa on road to São Gabriel, H.S. Irwin et al. 14198 (NY, FTG); Chapada dos Veadeiros, H.S. Irwin et al. 24670 (NY, FTG); 13 km S of São Joao de Alianca, W.R. Anderson 7581 (NY, FTG); 13 km E of Cristalina, W.R. Anderson 8310 (NY, FTG); Serra Dourada, 20 km S E, of Goiás Velho, H.S. Irwin et al. 11778 (FTG, NY, MO); Serra dos Cristais, 10 km W of Cristalina, 4 March 1966, H.S. Irwin et al. 13464 (FTG, NY); Serra dos Pirineus (Mun. Pienopolis), P.I.Oliveira & W.R. Anderson 465 (MBM, FTG); Mun. Planaltina, 16 km N de São Gabriel, G. Hatschbach & Silva 59993 (CTES, MBM, S). Minas Gerais: Cabeceira Grande, A.A.Santos & J.B. Pereira 1814 (CEN).

Figures

Figure 6. Sepals of Ipomoea species. A I. argyreia B I. tricolor C I. argentea D I. syringiifolia E I. eriocalyx F I. procurrens G I. tarijensis H I. regnellii. Photographs of A (Mendoza 4899); C (Mendoza 4705) and F (Mendoza 4900) by Moises Mendoza; B (Wood & Soto 27960) and H (Wood & Soto 27951) by Daniel Soto; D by Hector Keller; E (Wood et al. 27809) by Beth Williams; G (Wood 27920) by John Wood.