Ipomoea lanuginosa O'Donell

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

27. Ipomoea lanuginosa O'Donell , Lilloa 23: 445. 1950. ( O’Donell 1950a: 445)

Type.

ARGENTINA. Misiones, San Ignacio, 31 March 1948, C. O’Donell 5611 (lectotype LIL001249, designated here).

Description.

Decumbent perennial with thick root tubers, stems 3-6 m long, densely lanate but eventually glabrescent. Leaves petiolate, 4-10 × 1.5-4.5 cm, broadly to narrowly ovate-elliptic, usually simple, sometimes weakly 1-2-lobed, rarely 5-partite, obtuse to acute, base rounded to cuneate, both surfaces woolly, the lower surface densely so; petioles 1-2(-6) cm. Inflorescence of compact pedunculate, axillary cymes; peduncles 4-12 (-20) cm, lanate; bracteoles 5-12 × 2-3 mm, lanceolate, lanate, moderately persistent; secondary peduncles, if present, 2-4.5 cm; tertiary peduncles (if present) up to 2.5 cm; pedicels often short, 0 -13 mm, densely lanate; outer sepals 10-14 mm, elliptic, lanate, obtuse; corolla 5-8 cm long, pink, the tube purplish inside, midpetaline bands woolly, limb c. 5 cm diam. Capsules glabrous; seeds densely tomentose, black.

Illustration.

O’Donell (1950a: t. 9).

Distribution.

A very rare, possibly extinct species known from single locations in Argentina, Paraguay and Brazil. Not recorded from Paraguay since 1943 or from Argentina since 1949 despite search in the San Ignacio area by Hector Keller. Probably a cerrado species.

ARGENTINA. Misiones: San Ignacio, E.L. Ekman 1420 (NY, S); ibid., G. J. Schwarz 5446 (K, P).

PARAGUAY. Itapúa: Encarnación, Spagazzini 23 /1/1907 (LPS); ibid., L. Jiménez 37 (SCP).

BRAZIL. Rio Grande do Sul: Hagelund 3300C (ICN), fide Ferreira and Miotto (2009: 446).

Note.

This species is characterised by the white lanate indumentum, very short, densely lanate pedicels and the moderately persistent, relatively large bracteoles.