Ipomoea psammophila

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

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.

Figures

Figure 23. Ipomoea psammophila. A habit B flowering shoot C outer sepal D inner sepal E corolla opened out to show stamens F ovary and style G habit showing fruiting inflorescence with capsule H seed. Drawn by Rosemary Wise A, C-F from Wood 20691; B from Wood et al. 23578; G-H from Wood 27910.