taxonID	type	description	language	source
CEED921C54A9521DA6AB8C7DB855CE4A.taxon	diagnosis	Diagnosis. P. curvitubus is florally similar to P. lui and P. tenuitubus. However, it can be distinguished from these by leaf characteristics, with leaves elliptic to oblong-ovate, apex obtuse or slightly acuminate, base cuneate (vs P. lui, ovate or broadly ovate; apex subacute or obtuse, base cordate to shallowly cordate, oblique; vs P. tenuitubus, ovate to orbicular; apex obtuse, base cordate symmetrical or asymmetrical), corollas with purple stripes (vs absent in P. lui and P. tenuitubus), corolla lobes obovate-elliptic to oblong, apex acuminate (vs P. lui, lobes oblong, obovate to suborbicular, apex obtuse; vs P. tenuitubus, lobes narrowly ovate to ovate, apex obtuse), and ovary conical, ca. 2.5 × ca. 0.8 mm (vs P. lui, linear, ca. 3 × 1.5 mm; vs P. tenuitubus, ovoid, 1 – 2 × 1 – 1.5 mm) (Table 1).	en	Wei, Jin-Xin, Pan, Bo, Ding, Tao (2025): Petrocodon curvitubus, a new species of Gesneriaceae from Guangxi, China. PhytoKeys 252: 77-85, DOI: 10.3897/phytokeys.252.136306
CEED921C54A9521DA6AB8C7DB855CE4A.taxon	description	Description. Perennial herbs. Rhizome short and straight, subterete, 1 – 3.8 cm long, 7.5 – 9 mm in diameter. Leaves 10 – 18, basal, alternate, and congested at rhizome apex; petiole terete, adaxially pale green, abaxially pale brown, 2.5 – 6.4 cm long, 2 – 2.5 mm in diameter, densely white pubescent. Leaf blade herbaceous, elliptic to oblong-ovate, 2.1 – 13.3 × 1.1 – 7.5 cm, apex obtuse or slightly acuminate, base cuneate, margin crenulate, adaxially surface pale green, abaxially grayish green, both surfaces densely white pubescent, lateral veins pinnate 5 – 8 pairs on each side, adaxially concave, abaxially prominent. Inflorescences 3 – 6, axillary, 1 – 5 - branched, cymose, (4 -) 10 – 16 (- 22) - flowered; peduncles 2.2 – 6.8 cm long, 2 – 2.5 mm in diameter, densely white pubescent; bracts 2, linear, opposite, 4 – 5 × ca. 0.5 mm, outside densely white pubescent, inside glabrous; pedicels 3 – 8 mm long, 0.3 – 0.7 mm in diameter, densely white pubescent. Calyx 5 - lobed from base, pale green, lobes linear to triangular, 4 – 6 × ca. 0.5 mm, outside densely white pubescent, inside glabrous; Corolla pale purple, zygomorphic, 1.8 – 2.2 cm long, both surfaces sparsely puberulent, with two dark purple longitudinal stripes in the corolla mouth; corolla tube slenderly tubular, strongly curved downwards at base (1 – 3 mm from the base), then bent forwards, 1 – 1.3 cm long, 1.5 – 2.5 mm in diameter at the mouth, 1 mm in diameter at the base, adaxial lip 2 - lobed to near base, obovate-elliptic, 0.5 – 0.7 cm long, ca. 0.3 mm in diameter, apex acuminate; abaxial lip 3 - lobed to base, oblong, 0.6 – 1.1 cm long, 2.5 – 4 mm in diameter, apex acuminate. Stamens 2, adnate about 6 mm from corolla base, glabrous; anthers pale yellow, ca. 1.5 mm long, dorsifixed, cohering apically; filaments ca. 1 mm long, white, glabrous. Staminodes 3, ca. 0.1 long, white, adnate 2.5 mm above corolla base. Disc annular, ca. 0.5 mm high, orange-yellow. Pistil ca. 5.5 mm long, ovary conical, ca. 2.5 mm long, ca. 0.8 mm in diameter, style ca. 3 mm long, ovary and style densely covered with short glandular and eglandular hairs, stigma bilobed, lobes oval, ca. 0.5 mm long. Capsule 0.5 – 1 cm long, about 2 mm wide, dehiscing 4 - valved. Seeds not seen.	en	Wei, Jin-Xin, Pan, Bo, Ding, Tao (2025): Petrocodon curvitubus, a new species of Gesneriaceae from Guangxi, China. PhytoKeys 252: 77-85, DOI: 10.3897/phytokeys.252.136306
CEED921C54A9521DA6AB8C7DB855CE4A.taxon	etymology	Etymology. The epithet originates from the strongly curved corolla tube.	en	Wei, Jin-Xin, Pan, Bo, Ding, Tao (2025): Petrocodon curvitubus, a new species of Gesneriaceae from Guangxi, China. PhytoKeys 252: 77-85, DOI: 10.3897/phytokeys.252.136306
CEED921C54A9521DA6AB8C7DB855CE4A.taxon	distribution	Distribution and habitat. Petrocodon curvitubus can only be found at its type locality, Longguang Township, Debao, Baise, Guangxi. It grows on a limestone wall at the entrance of a karst cave at an altitude of 454 m. The average annual temperature in Debao County is 19.5 ° C, and the average annual precipitation is 1456.2 mm.	en	Wei, Jin-Xin, Pan, Bo, Ding, Tao (2025): Petrocodon curvitubus, a new species of Gesneriaceae from Guangxi, China. PhytoKeys 252: 77-85, DOI: 10.3897/phytokeys.252.136306
