Ipomoea sidifolia Schrad., Goett, 1821

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

404. Ipomoea sidifolia Schrad., Goett , Gel. Anz. 1821 (2): 719. 1821. (Schrader 1821: 719)

Ipomoea tubata Nees , Flora 4: 301. 1821. (Nees ab Esenbeck 1821: 301). Type. BRAZIL. Prinz von Neuwied (holotype of unknown whereabouts, isotype GOET 000810).

Type.

BRAZIL. Prinz von Neuwied (lectotype GOET 000810, designated here).

Description.

Liana to 10 m; stems subtomentose, woody. Leaves petiolate, 3-11 × 2.5-8 cm, ovate, shortly acuminate, cordate with broad sinus, adaxially green, tomentellous, abaxially grey-tomentose; petioles 1.5-5 cm, tomentellous. Inflorescence of few-flowered axillary cymes, peduncles 2-5.5 cm, white-tomentellous; bracteoles 5-7 mm, oblong-lanceolate, white-tomentellous, tardily deciduous; secondary peduncles up to 1.5 cm; pedicels (5-)15-45 mm, often long and straight, white-tomentose; outer sepals unequal, outer 10-15 × 6-7 mm, ovate, acute, abruptly narrowed to subtruncate at base, often undulate to fimbriate-margined, white-tomentose, inner sepals 16-17 × 7 mm, broadly oblong, obtuse, tomentellous with broad scarious margins; corolla hypocrateriform, with cylindrical basal tube 3.5-4.5 cm in length and spreading, deep pink, lobes, pilose on the exterior, especially on tube and midpetaline bands, limb 5.5-6 cm diam.; stamens exserted, equal. Capsules 16 × 12 mm conical, shortly rostrate, tomentellous; seeds 8-9 × 5 mm, long-pilose.

Illustration.

Figure 198 .

Distribution.

Endemic to the cerrado biome in Brazil, where it is common in Minas Gerais and Goiás.

BRAZIL. Bahia: Ilhéus, T.S. Santos et al. 3215 (K, RB). Dist. Fed.: Bacia do Rio Bartolomeu, E.P. Heringer 4501 (IBGE, K); Córrego Forquilha, B.A.S. Pereira 261 (IBGE, K); Rio Contagem, H.S. Irwin et al. 15703 (E, K, NY). Goiás: Santa Cruz, J.B. Pohl 2745 (OXF, W); Goiânia, G. Hatschbach 36992 (MBM, MO, NY); Huapolis, A. Macedo 3282 (MO, S). Minas Gerais: Serra do Cipó, D. Zappi & N. Taylor 2266 (SPF, K); Uberlandia, B.C. Vargas 114 (HUFU); Delfinópolis, Est. Carmen Silvia, A.C.B. Silva 374 (RB). Pernambuco: Sanharó, Andrade Lima 66 -4538 (RB); Mun. De Brejo da Madre de Deus, L.F. Silva et al. 201 (K, PEUFR). São Paulo: Jeriquara, Mattos & Bicalho 11610 (SP).

Typification.

This species has long been known as Ipomoea tubata but the name Ipomoea sidifolia was published in the same year and has precedence so should be adopted for this species. Both names were based on the same collection. In order to avoid ambiguity the specimen at GOET is here chosen as lectotype even though it is not annotated either by Schrader or by Nees. It is only extant example of the original material that we are aware of.

Note.

A very distinctive species because of its liana habit, hypocrateriform corolla, exserted stamens and tomentellous ovary and capsule. It is the only species we have observed in which the lower half of the style is pubescent.

Figures

Figure 198. Ipomoea sidifolia. A habit B adaxial leaf surface C abaxial leaf surface D outer sepal E inner sepal F corolla opened out to show stamens G ovary and style H fruiting inflorescence with capsules J seed. Drawn by Rosemary Wise A-E from Pohl 2745; F-J from Zappi & Taylor 2266.