Ipomoea nervosa

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

393. Ipomoea nervosa (Burm. f.) J.R.I. Wood & Scotland, Nature Plants 2019, suppl. inf.: 29. ( Muñoz-Rodríguez et al. 2019, suppl. inf.: 29)

Convolvulus nervosus Burm. f., Fl. Indica 48: 1768. (Burman, NL 1768: 48). Type. INDIA. Coromandel, Outgaerden [Van Outgaarden] s.n. (lectotype G-PREL, designated by Staples and Jacquemoud 2005: 60).

Lettsomia nervosa (Burm. f.) Roxb., Fl. Ind. 2: 78. 1824. (Roxburgh 1824: 78).

Argyreia nervosa (Burm. f.) Bojer, Hortus Maurit. 224. 1837. (Bojer 1837: 224).

Rivea nervosa (Burm. f.) Hallier f., Bull. Herb. Boiss., 5: 381. 1897. (Hallier 1897a: 381).

Convolvulus speciosus L.f., Suppl. Pl. 137. 1781 [pub. 1782]. Type. BRAZIL. Vandelli, LINN-HL218-23. (leaf only).

Ipomoea speciosa (L.f.) Pers., Syn. Pl. 1: 183. 1805. (Persoon 1805: 183).

Argyreia speciosa (L.f.) Sweet, Hort. Brit. 289, 1827. (Sweet 1826: 289).

Samudra speciosa (L.f.) Raf., Fl. Tellur. 4: 72.1838. (Rafinesque 1838a: 72).

Ipomoea valerii Standl. & L.O. Williams , Ceiba 3: 55. 1952. (Standley and Williams 1952a: 55). Type. HONDURAS. Morazán. Sabanagrande, J. Valerio-R. 3272 (holotype US00111484 (Received from EAP), isotype F).

Type.

Based on Convolvulus nervosus Burm. f.

Description.

Twining liana climbing to several metres, stems, stout, white-sericeous, latex white. Leaves petiolate, large, 9-17 × 8-15 cm, ovate cordate, apex acute to rounded and shortly mucronate, adaxially green, glabrous, abaxially white tomentose; petioles 3-10 cm, white sericeous. Inflorescence of long-pedunculate, bracteolate cymes, often compact; peduncles 15-21 cm, sericeous; bracteoles 2.5-6 × 1.8-3.2 cm, ovate, to broadly oblong-elliptic, long-acuminate, papery, pale yellow-green, sericeous, deciduous; secondary peduncles 1 cm; pedicels 2-6 mm, sericeous; sepals 12-16 × 10-11 mm, elliptic-obovate, mucronate, sericeous; corolla 5-6 cm long, dark pink, sericeous, abruptly widened above a short basal tube, funnel-shaped; limb lobed, c. 4 cm diam. Capsules c. 2 × 1.5 cm, subglobose, glabrous, partially enclosed by the strongly accrescent sepals, which can reach up to 2.5 × 2.5 cm; seeds 6 × 4 mm, shortly tomentose.

Illustration.

Austin (1975b: 215); Liogier (1994: 115); Bosser and Heine (2000: 25); Deroin (2001: 137) all as Argyreia nervosa .

Distribution.

Native of Asia of imprecise origin. Most records even from the Old World are of cultivated plants. In the Neotropics it is sometimes cultivated for its flowers, principally around the Caribbean and is occasionally reported as an escape.

BRAZIL. Type of Convolvulus speciosus L.f.

PANAMA. Fide Austin (1975b).

HONDURAS. Type of Ipomoea valerii Standl. & L.O. Williams.

CUBA. La Habana, E.L. Ekman 1254 (S)

DOMINICAN REPUBLIC. E.L. Ekman H15355 (S); W. Allard 15732 (S).

JAMAICA. D. Hummel 29/4/1958 (S).

Note.

This is the only representative of the large, entirely Old World Argyreia Clade that occurs in the Neotropics.

• Species 394-397 form a clade of morphologically very similar species, native to the neotropics. Molecular studies using ITS strongly suggest that Ipomoea abutiloides , I. pearceana and I. sericosepala are sisters of the African species Ipomoea shirensis Oliv. , which is very similar morphologically to I. sericosepala .