taxonID	type	description	language	source
FC3341FB6E9A5D9CBB7E5D0D2A467505.taxon	description	Fig. 1	en	Li, Qi-Yang, Tan, Ke, Do, Truong Van, Xin, Zi-Bing, Bai, Xin-Xiang, He, Song-Tao, Wen, Fang (2025): Metapetrocosmea navicularis, a new species of Gesneriaceae in Vietnam. PhytoKeys 261: 87-98, DOI: 10.3897/phytokeys.261.160454
FC3341FB6E9A5D9CBB7E5D0D2A467505.taxon	diagnosis	Diagnosis. Metapetrocosmea navicularis is similar to M. tamiana in macroscopic morphology, and phylogenetic analysis indicates that they are the closest relatives (Fig. 1). But it is easy to distinguish the new species from M. tamiana by its leaf blade ovate to ovate-elliptic (vs. cordate to nearly round, the following comparisons follow the same order), leaf densely puberulent adaxial (vs. with mixture of long and short pubescence adaxial), bracts 6 – 9 mm long (vs. ca. 2 cm long), the ratio of corolla lobes length to corolla tube length consistently 1: 3 (vs. approximately 1: 1), 10 – 20 - flowered or more (vs. 4 – 6 - flowered), corolla tube gradually narrowed from mouth to base, subcylindrical-infundibulate (vs. wider in upper part, abruptly contracted towards base, distinctly infundibulate), filaments pubescent near the top (vs. glabrous), style puberulent (vs. pubescent), and stigma arcuate (vs. nutant) (Table 2).	en	Li, Qi-Yang, Tan, Ke, Do, Truong Van, Xin, Zi-Bing, Bai, Xin-Xiang, He, Song-Tao, Wen, Fang (2025): Metapetrocosmea navicularis, a new species of Gesneriaceae in Vietnam. PhytoKeys 261: 87-98, DOI: 10.3897/phytokeys.261.160454
FC3341FB6E9A5D9CBB7E5D0D2A467505.taxon	description	Description. Perennial herb. Rhizome subcylindrical, ca. 4 cm long, 6 – 8 mm in diameter, perennial-growing rhizomes exhibit distinct abscission scars following leaf abscission. Leaves 8 – 12 or more, petiolate; petioles 3 – 6 cm long, ca. 3 mm in diameter, pale green, puberulous; leaf blade alternate, ovate to ovate-elliptic, 6 – 8 × 2.5 – 4 cm, dark green to green adaxially with pale green veins commonly, pale green abaxially, apex acute, base obtuse, peltate, margin crenate, densely puberulent; venation penninerved, lateral veins 3 – 5 pairs, inconspicuously impressed adaxial veins, prominently raised abaxial. Inflorescence cymes, axillary, 10 – 20 - flowered or more. Peduncles densely pubescent, 6 – 12 cm long, ca. 4 mm in diameter; pedicels 1 – 3 cm long, ca. 2 mm in diameter, densely pubescent. Bracts 2, opposite, distinctly navicula, namely generally oblong-elliptic, base broader, apex attenuate being acuminate, resembling a small boat, 5 – 9 × 2 – 3 mm, margin entire but slightly reflexed, densely pubescent, deciduous, generally not persistent; calyx 5 - parted to the base, lobes nearly equal in length, ca. 8 × 2 mm, lanceolate, dark green, apex acute, outside villosulous, inside glabrous, margin ciliate. Corolla pale purple to white, ca. 3.5 × 2.5 cm, bilabiate; upper lip 2 - lobed, split to the midpoint of the corolla tube, lobes ca. 9 × 6 mm; lower lip 3 - lobed, central lobe more rounded than lateral lobes, lobes ca. 9 × 8 mm; corolla tube gradually narrowed from mouth to base, subcylindrical-infundibulate, with two dark purplish-blue lines that stretch from either side of the median lobe of the corolla down into the throat. Stamens 2, ca. 7 mm long, inserted at 8 mm from the base of the corolla; filaments linear, white, villous near the top, arcuate; anthers oblong, pale yellow, ca. 3 mm long, lanate; staminodes 2, ca. 4 mm long, ca. 1 mm in diamete, inserted at 8 mm from the base of the corolla, villous near the top, slightly curved. Disc annular, pale yellowish-green, ca. 1 mm high, glabrous. Pistil ca. 1.8 cm long; ovary linear, ca. 6 mm long, densely pubescent; style linear, ca. 1 cm long, white, densely puberulent; stigma obtrapeziform, emarginate. Capsule obliquely narrowly oblong, ca. 3 cm long, dehisces along the ventral suture; seed surface, longitudinal prominent ribs are further linked to become somewhat reticulate.	en	Li, Qi-Yang, Tan, Ke, Do, Truong Van, Xin, Zi-Bing, Bai, Xin-Xiang, He, Song-Tao, Wen, Fang (2025): Metapetrocosmea navicularis, a new species of Gesneriaceae in Vietnam. PhytoKeys 261: 87-98, DOI: 10.3897/phytokeys.261.160454
FC3341FB6E9A5D9CBB7E5D0D2A467505.taxon	distribution	Distribution and habitat. Metapetrocosmea navicularis is relatively common in moist with abundant populations and shaded habitats under evergreen broad-leaved forests at an altitude of approximately 190 m in its type locality. This species grows in moist rock crevices, with accompanying species mainly including some ferns and other herbaceous plants.	en	Li, Qi-Yang, Tan, Ke, Do, Truong Van, Xin, Zi-Bing, Bai, Xin-Xiang, He, Song-Tao, Wen, Fang (2025): Metapetrocosmea navicularis, a new species of Gesneriaceae in Vietnam. PhytoKeys 261: 87-98, DOI: 10.3897/phytokeys.261.160454
