Ipomoea nationis (Hook.) G. Nicholson

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

309. Ipomoea nationis (Hook.) G. Nicholson , Ill. Dict. Gard. 2: 191. 1885. (Nicholson 1885: 191)

Quamoclit nationis Hook. , Bot. Mag. 90: t. 5432. 1864. (Hooker, WJ1864: 191). Type. PERU. A. Mathews 721 (lectotype K000612866, designated here; isolectotypes K, OXF).

Type.

Based on Quamoclit nationis Hook.

Description.

Perennial climbing herb with root tubers, stems glabrous or pilose. Leaves petiolate, 2-8.5 × 1.3-8 cm, ovate-deltoid to suborbicular, acute, base truncate to cordate, the auricles rounded to subacute, margin entire or undulate, abaxially paler, glabrous except at apex of petiole and on main veins beneath; petioles 1-7 cm, usually glabrous below but pubescent upwards. Inflorescence of long pedunculate, 1-3-flowered axillary cymes; peduncles 6-20 cm, thinly retrorse-pilose, occasionally glabrous; bracteoles 1-3 mm, lanceolate, tardily caducous; pedicels 7-15 mm, retrorse-pilose; sepals unequal, outer 8-10 × 2-3 mm, oblong-lanceolate, acute to mucronulate, pubescent, green, inner 8-10 × 4 mm, ovate, obtuse and strongly mucronate, scarious apart from a green central area; corolla scarlet, glabrous, hypocrateriform with cylindrical tube 3-3.5 cm long and c. 0.5 cm wide, limb 3-5 cm diam.; stamens exserted. Capsules 6 × 5 mm, ellipsoid, enclosed by persistent sepals, glabrous; seeds 4 × 1.5 mm, glabrous.

Illustration.

Figures 8G , 150 .

Distribution.

Endemic to Peru, occurring principally in the coastal lomas near Lima, but ascending to at least 2700 m in the Canta district.

PERU. Cajamarca: San Pedro, A. Sagástagui et al. 15609 (F, MO). Junín: Satipo-Junín, F. de la Puente 680 (CIP). Lima: D. Stafford 36 (K); Matucana, J.F. Macbride & Featherstone 144 (F); Canta, R. Ferreyra 8992 (USM); Lomas region, C. Sandeman 4339 (OXF), R. Ferreyra 6917 (F, USM); Puruchuca, A. Matthews 778 (K).

Typification.

In choosing a lectotype we have selected the Mathews collection at Kew. This sheet has a copy of the Botanical Magazine plate pinned to it and it is obvious that the illustration and much of the protologue must have been based on this collection rather than the piece sent by W. Nation (K000612867) which lacks an open corolla.

Figures

Figure 8. Corollas showing variations in form (side view), size, limb lobing and stamen exsertion. A Ipomoea argentea B I. repanda C I. neei D I. electrina E I. habeliana F I. santillanii G I. nationis H I. rubriflora J I. longistaminea K I. megapotamica L I. megalantha M I. neriifolia N I. syringifolia P I. ramosissima Q I. elongata R I. mucronatoproducta. A from Wood et al. 25639 and photo; B from Whitefoord 5244; C from Skutch 2043; D from Breedlove 27626; E from Bentley 203; F from Bourgeau 3024; G from Saunders 987; H from Wood et al. 27678; J from Pastore et al. 2678; K from Wood et al. 28060; L from Hassler 9114; M from Rezende et al. 1011; N from Stutz 1426 and photo; P from Bang 2246; Q from Purpus 3904; R from Wood & Villarroel 25474. Drawn by Rosemary Wise.

Figure 150. Ipomoea nationis. A habit B habit with single flower C outer sepal D inner sepal E corolla opened out to show stamens F ovary and style G Capsule and calyx in fruit H seed. Drawn by Rosemary Wise A from Stork & Horton 9261 B from Matthews 778, C-G from Saunders 987 H from Sandeman 4339.