25. Ipomoea psammophila J.R.I. Wood & Scotland, Kew Bull. 70 (31): 48. 2015. (Wood et al. 2015: 31)

Type.

BOLIVIA. Santa Cruz, Prov. Chiquitos, entrando hacia Motacú por San Juanama, near Santiago de Chiquitos, J.R.I. Wood, D. Soto, P. Pozo, W. Hawthorne & D. Villarroel 25122 (holotype USZ, isotypes K, LPB, UB).

Description.

Vigorous trailing perennial herb; rootstock, woody, forked; stems angled, obscurely bifariously puberulent, glabrescent. Leaves shortly petiolate, 3-7.5 × 1-4.5 cm, ovate, elliptic to suborbicular, apex emarginate and mucronate, obtuse or rounded, base truncate to very shallowly cordate, margin entire, green and glabrous on both surfaces; petioles 3-9 mm, glabrous to pubescent. Inflorescence of (1-)3(-5)-flowered axillary cymes; peduncles 1.5-9 cm, glabrous to very thinly pubescent; secondary peduncles (when present) 7-8 mm; bracteoles 1.5 × 0.5 mm, lanceolate, obtuse, caducous; pedicels 3-10 mm, pubescent; sepals subequal, 11-12 mm long, outer sepals narrowly ovate, obtuse to subacute, puberulent to pubescent, inner sepals ovate-elliptic, thinly to densely pubescent, c. 1 mm longer, margins scarious; corolla 5 -7 cm long, pink, funnel-shaped, in bud pubescent, limb c. 7 cm diam., shallowly lobed. Capsules c. 13 × 10 mm, ovoid, rostrate with mucro 1.5 mm long, glabrous; seeds 7 × 3.5 mm, oblong, brown, obscurely puberulent but appearing glabrous, minutely scaly on margin.

Illustration.

Figure 23.

Distribution.

Endemic to Bolivia, where it grows in cerrado on sandy soil in two areas of Santa Cruz Department.

BOLIVIA. Santa Cruz: Chiquitos, around Santiago de Chiquitos R. Guillén et al. 4799 (MO, USZ); J.R.I. Wood et al. 20171 (BOLV, K, LPB, USZ); south of Taperas J.R.I. Wood et al. 23578 (K, LPB, UB, USZ); south of San José de Chiquitos, J.R.I. Wood et al. 29159 (LPB, USZ).

Note.

Resembles Ipomoea nitida Griseb., particularly subsp. krapovickasii, but the leaves are glabrous or obscurely pubescent, their base cordate to truncate, rather than truncate to cuneate, the petioles very short (0.3-0.9 cm, not 2-4 cm), the cymes usually 1-3-flowered (not up to 7-flowered) and the sepals green, pubescent, rather than grey-tomentellous, 11-12 mm (not 7-9 mm) long. Molecular data suggest the two species are not closely related.