Ipomoea schomburgkii Choisy in A.P. de Candolle

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

169. Ipomoea schomburgkii Choisy in A.P. de Candolle , Prodr. 9: 354. 1845. (Choisy 1845: 354)

Ipomoea graminiformis Meisn. in Martius et al. , Fl. Brasil. 7: 250. 1869. (Meisner 1869: 250). Type. BRAZIL. Goiás, W.J. Burchell 8556 (holotype BR00005305780, isotype K).

Type.

GUYANA. R. Schomburgk 692 (holotype K000612791, isotype BM).

Description.

Glabrous perennial herb with xylopodium and erect, somewhat succulent stems to 50 cm. Leaves sessile, 4-16 × 0.1-0.3 cm, linear, somewhat glaucous, tapering at both ends, acute. Inflorescence ± terminal, up to 30 cm long, but usually much less, formed of pedunculate cymes from the uppermost leaf axils; peduncles 0-5 cm, diminishing in length upwards; bracteoles filiform, up to 10 mm long, caducous; pedicels 5-13 mm; sepals subequal, coriaceous, somewhat convex, 5-7 × 3-4 mm, elliptic, outer acute to obtuse, c. 1 mm shorter than inner, inner rounded, slightly scarious on margins; corolla c. 4.5 cm long, pink with a darker centre, glabrous, limb weakly lobed, c. 4 cm diam. Capsules and seeds not seen.

Illustration.

Figure 99 ; Austin (1998: 401).

Distribution.

Scattered on seasonally flooded plain at low altitudes in South America from the Guianas, Venezuela and Colombia south to Bolivia. Most common in the llanos region of eastern Colombia, southern Venezuela and the Guianas. Rare elsewhere. Records from Paraguay are errors.

BRAZIL. Goiás. Type of Ipomoea graminiformis . Mato Grosso: C.A.M. Lindman 3115 (S); São José do Xingu, D.C. Zappi et al. 3229 (K, RB); Parque Estadual Cristalino, J.H. Piva 999 (K). Pará: Parque Indigena do Tumucumaque, P. Cavalcante 2520 (K). Rondônia: Vilhena, M.G. da Silva 4654 (INPA). Also Mato Grosso do Sul and Tocantins fide Flora do Brasil (2020).

GUYANA. Jansen-Jacobs et al. 4608 (K).

SURINAM. Rombouts 386 (K).

BOLIVIA. La Paz: Iturralde, Luisita, S.G. Beck & R. Haase 10100 (LPB); R. Haase 801 (LPB), 840 (LPB). Santa Cruz: Velasco, El Refugio, R. Guillén & V. Roca 2992 (ARIZ, LPB, MO, OXF, USZ); J.R I. Wood & D. Soto 27914 (OXF, K, LPB, USZ).

COLOMBIA. Arauca: Laguna La Venera, J.P. Jørgensen 62 (COL). Guainía: La serranía, Manacasias, J. Cuatrecasas 7821 (COL). Guaviare: Barrancon, N.C. Garzón 0026 (COL). Meta: Lehmann 8796 (K). Vichada: San José de Ocune, O. Haught 2799 (US); Maypures, Spruce 3810 (K).

VENEZUELA. Amazonas: Puerto Ayacucho, G. Davidse & O. Huber 14953 (MO). Apure: G. Aymard 5649 (MO). Bolívar: J. Steyermark et al. 131362 (MO). Guárico: K.R. Robertson & D.F. Austin 178 (MO). Monagas: L. Aristeguieti 3912 (MO).

Note.

Readily distinguished by the herbaceous, slightly fleshy stems, linear leaves, subequal sepals, glabrous corolla and distinctive habit and habitat.

Figures

Figure 99. Ipomoea schomburgkii. A habit B portion of stem C outer sepal D inner sepal E corolla opened out to show stamens F ovary and style. Drawn by Rosemary Wise from Wood & Soto 27914.