Protologue Description: Jaltomata sagastegui Mione. TYPE: Peru. Dept. Cajamarca, prov. Contumazá: "alrededor de Guzmango, 2,500 m, borde de acequia, 9 Junio 1990", A. Sagástegui A. 14388 (holotype: F; isotype: Mione herbarium).

Corolla tubulosa-brevis cum limbo rotato, limbus quinquelobus; stamina non exserta ab corollae tubo; stylus 3.5--5mm longus; calyx parva fructifera, lobi radius ad 4.5 mm, sinus radius ad 3 mm.

Branching shrub to 1 m. Younger stems somewhat 4- or 5-sided, woody stems (brown) terete and hollow. Hairs of young stems dendritic, rarely forked or of the finger type, to 0.4 mm long. Leaves often geminate; ovate (Fig. 1a), the apex sometimes acuminate, margin entire or repand; 3.2--14 cm long, 1--6.5 cm wide; adaxially and abaxially tomentulose with interspersed dendritic and finger hairs 0.04--0.22 mm long. Inflorescence to 12-flowered; sometimes branched. Peduncles 9.5--28 mm long, longer than attached pedicels; green; straight (Fig. 1b); ligneous at fruiting; pedicels 4.5--7 mm long. Calyx at anthesis green; 5.1--6.5 mm in diameter; lobe radius 2.6 mm; sinus radius 1.2 mm; abaxially tomentose with a dense covering of branched hairs (Fig. 1b); lobes reflexed. Corolla short-tubular with a rotate limb (Fig. 1b); limb with 5 corolla lobes alternating with 5 inconspicuous to absent lobules (Fig. 1a); white with two purple ovate maculae straddling the main vein to each corolla lobe; limb 11--14 mm in diameter; tube 4--5 mm long and 4.5--5 mm in diameter. Stamens 3.2--3.4 mm long, not exserted beyond mouth of corolla tube (Fig. 1a). Filaments with finger hairs along basal 40--50 %, the hairs to 0.5 mm long. Anthers, undehisced 1.6--2.0 mm long by 1.3--1.5 mm wide. Pollen grains 75,000--93,000 per flower, 25--30 µm in diameter. Stigma (arrow, Fig. 1a) diameter 0.33--0.6 mm. Style length 3.5--5.4 mm, exserting 1--3 mm beyond anthers (Fig. 1a). Ovules 56--87 per ovary. Fruits 5--8 mm across (Fig. 1c), yellow-orange (type), orange (greenhouse). Calyx (fruiting) small (Fig.1c): lobe radius to 4.5 mm, sinus radius to 3 mm. Chromosome number n = 12.

Jaltomata sagastegui, is distributed in northern Peru, Dept. Cajamarca, prov. Contumazá. The type, collected in June, bears fruits. The herbarium label indicates that the fruits are eaten and the local name is "canamuela". The specific epithet was chosen to honor the eminent Peruvian botanist Abundio Sagástegui Alva.
Name derivation: The specific epithet was chosen to honor the eminent Peruvian botanist Abundio Sagástegui Alva.