Justicia angustituba J. R. I. Wood & R. Villanueva, 2025

Villanueva-Espinoza, Rosa, Deng, Yunfei, Scotland, Robert & Wood, John R. I., 2025, Preliminary notes on Justicia (Acanthaceae) in Peru, PhytoKeys 258, pp. 1-123 : 1-123

publication ID	https://doi.org/10.3897/phytokeys.258.144435
DOI	https://doi.org/10.5281/zenodo.15676486
persistent identifier	https://treatment.plazi.org/id/19C53C44-4C74-518E-BB52-803887C96206
treatment provided by	PhytoKeys by Pensoft
scientific name	Justicia angustituba J. R. I. Wood & R. Villanueva
status	sp. nov.

Treatment

19. Justicia angustituba J. R. I. Wood & R. Villanueva sp. nov.

Type.

Peru • Cajamarca, Prov. San Ignacio Dist. Chirinos, Las Juntas, margen derecha del Río Tabaconas , 5°21'S, 78°46'W, 550–650 m, 3 Feb. 1996, J. Campos & O. Diaz 2380 (holotype F-2235748 , isotypes MO-5297086 , US-3387861 , USM) GoogleMaps .

Diagnosis.

A new species resembling Justicia goudotii but the leaves consistently smaller, 2–3 × 0.8–2.4 cm (not 4–12 × 1.5–6 cm), inflorescence terminal (not axillary and terminal), calyx shorter, 6–7 mm (not 8 mm long) and the capsule pubescent (not glabrescent).

Description.

Herb to c. 40 cm in height, stems at first decumbent and rooting, then erect, somewhat wiry below, crisped-pubescent above, glabrescent below. Leaves petiolate, small, lamina (1 –) 2–3 × 0.8–2.4 cm, ovate, apex acute, base rounded and very shortly decurrent onto the petiole, cystoliths abundant adaxially, both surfaces pubescent but abaxially more densely so, paler, lateral veins 4–5 pairs; petioles 0.2–0.8 cm, pubescent. Inflorescence of subsessile, few-flowered clusters terminal on the branches; peduncles 0–2 mm, hirsute; pedicels 1–2 mm; bracts 10 × 3 mm, narrowly oblong-elliptic, narrowed at both ends, apex acuminate and acute, ciliate on margins and veins; bracteoles linear 3 × 0.5 mm; calyx 4 - lobed to base, lobes 8–10 × 1 mm, linear-lanceolate, acuminate, slightly narrowed to base, hirsute; corolla c. 1.5 cm long, pink, pubescent, tube c. 10 × 1 mm, slender, cylindrical, upper lip short, deltoid, hooded, subentire, c. 4 mm long, lower lip 3 - lobed, the palate with white “ herring bone ” patterning, the lobes c. 6 × 2.5 mm, oblong, rounded; filaments 2 mm long, glabrous, anther thecae 1.25 × 0.5 mm, oblong, glabrous, lower held at right angles; pollen prolate, 50–54 × 29–30 μm, 2 - aperturate, colporate, 2 rows of c. 8–12 of insulae on either side of aperture (Fig. 50 B View Figure 50 ); ovary, glabrous. Capsule 10 × 3 mm, clavate, thinly pubescent, 4 - seeded; seeds rounded, c. 2 mm diam., smooth, glabrous.

Illustration.

Fig. 19 View Figure 19 .

Etymology.

This species is given the epithet “ angustituba ” because of its distinctively slender corolla tube.

Phenology.

Found in flower in February and June.

Habitat.

Secondary woodland, 450– 650 m.

Distribution.

Endemic to San Ignacio Province in Cajamarca Department, Peru. Fig. 59 View Figure 59 .

Material examined.

Peru • Cajamarca: Prov. San Ignacio, Dist. Chirinos, Las Juntas , the type collection ; • ibid., Las Juntas, 5°22'48"S, 78°46'58"W, 450 m, 1 June 2000, R. Rojas et al. 0892 ( MO) GoogleMaps .