Ipomoea paraguariensis Peter

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

55. Ipomoea paraguariensis Peter , Die Naturlichen Pflanzenfamilien 4 (3a): 29. 1897 [pub. 1891]. (Peter 1891: 29)

Ipomoea argyreia var. paraguariensis (Peter) Chodat & Hassl., Bull. Herb. Boiss. , ser. 2, 5: 689. 1905. (Chodat and Hassler 1905: 689).

Ipomoea argyreia forma paraguariensis (Peter) Hassl. [as var. discolor forma paraguariensis ], Repert. Spec. Nov. Regni Veg. 9: 195. 1911. (Hassler 1911: 195).

Ipomoea argyreia forma grandiflora Chodat & Hassl., Bull. Herb. Boiss. , ser. 2, 5: 689. 1905. (Chodat and Hassler 1905: 689). Type. PARAGUAY [ Canindeyú], Ipé Hú, Sierra de Maracayú, E. Hassler 5229 (lectotype G00166317, designated here; isolectotype G).

Ipomoea argyreia forma intermedia Chodat & Hassl. [as var. paraguariensis forma intermedia ], Bull. Herb. Boiss., ser. 2, 5: 689. 1905. (Chodat and Hassler 1905: 689). Type. PARAGUAY. [ Canindeyú], Yerbales de Sierra de Maracayu, 1898/9, E. Hassler 5748 (lectotype G00175069, designated here; isolectotypes BM, G, K, NY, P).

Ipomoea argyreia forma salicifolia Chodat & Hassl. [as var. paraguariensis forma salicifolia ], Bull. Herb. Boiss., ser. 2, 5: 68. 1905. (Chodat and Hassler 1905: 689). Type. PARAGUAY. [ Canindeyú], Caruguaty, E. Hassler 4599 (lectotype G00175072, designated here; isolectotypes BM, G, NY).

Ipomoea nitens Chodat & Hassler , Bull. Herb. Boiss. Ser. 2 5: 689. 1905 (Chodat and Hassler 1905: 689). Type. PARAGUAY. [ Canindeyú], fl. Jezui Guazu [ Río Jejuí Guazú], Dec. 1898, E. Hassler 5691 (holotype G00175121).

Ipomoea argyreia forma nitens (Chodat & Hassler) Hassl. [as var. discolor forma nitens ]., Repert. Spec. Nov. Regni Veg. 9: 196. 1911. (Hassler 1911: 196).

Ipomoea argyreia var. martii Hassl. , Repert. Spec. Nov. Regni Veg. 9: 195. 1911. (Hassler (Hassler 1911: 195). Type. PARAGUAY. [ Canindeyú], Ipé Hu, Sierra de Maracayu, E. Hassler 5229 (lectotype G00166317, designated here; isolectotypes G).

Ipomoea . argyreia var. discolor Hassl. , Repert. Spec. Nov. Regni Veg. 9: 195. 1911. (1911: 195). Type. PARAGUAY. [ Canindeyú], Yerbales de Sierra de Maracayu, 1898/9, E. Hassler 5748 (lectotype G00175069, designated here; isolectotypes BM, G, K, NY, P).

Type.

PARAGUAY. Villarrica, B.Balansa 1074 (lectotype GOET005546, designated by Staples et al. 2012: 673, isolectotypes GOET, G, K, P).

Description.

Erect subshrub from a woody rhizome, stems tomentose, eventually glabrescent. Leaves very shortly petiolate, 1.5-5 × 0.7-2.5 cm, oblong-elliptic or ovate-elliptic, mucronate, base rounded to cuneate, adaxially densely pubescent, green, abaxially silvery tomentose with long appressed hairs, veins moderately prominent; petioles 2-3 mm long. Inflorescence terminal, panicle-like formed of 1-3-flowered cymes; peduncles up to 1.5 cm; bracteoles 5-9 mm, lanceolate, caducous; pedicels 2-7 mm; sepals 6-8(-10 mm in fruit), ovate to suborbicular, obtuse, mucronate, tomentose, inner with glabrous, scarious margins; corolla 3.5-6 cm long, funnel-shaped, pink, tomentose, limb 3.5 cm diam. Capsules 10-12 × 7 mm, ellipsoid, glabrous seeds 5-6 × 3.5 mm, blackish, pilose on margins, the hairs c. 8 mm long, deciduous.

Illustration.

Figure 5B .

Distribution.

Endemic to cerrados in Paraguay and recorded from three departamentos but apparently rare.

PARAGUAY. Caazapá: Est. Nu Pyajhú, próximo a San Juan Nepomuceno, C.V. Pavetti s.n. (SCP); Coronel Oviedo, T. Carruthers et al. 105 (FCQ). Canindeyú: Curuguaty, T. Carruthers et al. 99 (FCQ). Guairá: Villarrica, B. Balansa 1074 (P), ibid., Jorgensen 4297 (F), ibid., Jorgensen 4297 (S); Col. Independencia, A. Schinini & E. Bordas 25218 (CTES); ibid., F. Mereles 3376 (FCQ, G); ibid., R. Degen et al. 4010 (FCQ).

Note.

Characterised by the discoloured elliptic leaves. Hassler 4599 (BM, G, NY), the type of Ipomoea argyreia forma salicifolia Chodat & Hassler (1905: 689) , is very close to Ipomoea rojasii but the leaves are discoloured, narrowly ovate and shortly acuminate, reaching only to 6.5 cm long, and the sepals are shorter. It looks like an intermediate between Ipomoea rojasii and I. paraguariensis .

Figures

Figure 5. Sepals of Ipomoea species. A Ipomoea descolei B I. paraguariensis C I. australis D I. purpurea (left), I. nil (right) E I. incarnata F I. pintoi G I. maurandioides H I. pubescens. Photographs of A by Hector Keller; B and G by T. Carruthers; C (Wood et al. 27708); E (Wood 27756) and H (Wood 27675) by Beth Williams; D by John Pink; F (Queiroz 15956) by Hibert Huaylla.