Oreocharis longituba W.H.Chen, Q.H.Nguyen & Y.M.Shui

Oreocharis longituba W.H.Chen, Q.H.Nguyen & Y.M.Shui, PhytoKeys 94: 95-106. 

Oreocharis longituba W.H.Chen, Q.H.Nguyen & Y.M.Shui; Photos Hoang Thanh Son

Vietnamese name: 

Chinese name:

English name:

Latin Name: 

Oreocharis longituba W.H.Chen, Q.H.Nguyen & Y.M.Shui

Family: 

Gesneriaceae

Description: 

Perennial herb. Leaves in basal rosette. Petiole 4–7 cm long, densely long pubescent; leaf blade (sub)orbicular, 3–9 × 2.4–8.9 cm, adaxially sparsely hirsute, abaxially pubescent, more densely so on venation, base cordate, apex rounded, margin crenate; lateral veins 5–6 pairs, adaxially depressed, abaxially prominent. Inflorescences axillary, 1–2-flowered. Peduncles 8–11 cm long, densely white villous; bracts 2, linear-lanceolate, 5–22 × 0.7–1.2 mm, adaxially subglabrous, abaxially pubescent; pedicel 1.8–2 cm, pubescent. Calyx 5-parted almost from base, segments linear-lanceolate, 8–15 × 1–4 mm, margin dentate, adaxially glabrous, abaxially white hispid. Corolla yellow, bilabiate, 3–3.5 cm long, inside pubescent, outside white glandular; tube narrowly infundibuliform, 2–2.5 cm long, 3–3.5 mm in diam. at base and 6–7 mm in diam. at throat; adaxial lip 6.5–7 mm long, 2-lobed, lobes suborbicular, 3.3–3.5 × 3.5–3.8 mm, apex obtuse; abaxial lip 3-lobed, lobes sub-oblong, almost equal, 8–10 × 6–8 mm, apex obtuse. Stamens 4, anthers coherent in two pairs, adaxial stamens 5–7 mm long, adnate to corolla tube 1.2–1.5 mm from base, abaxial stamens 7.5–8 mm long, adnate to corolla tube 1–1.2 mm from base; filaments glabrous; anthers round, basifixed, dehiscing longitudinally; staminode 1, 2.5–3 mm long, adnate to corolla tube 6–7 mm from base. Pistil 1.7–2.1 cm long when mature; ovary cylindrical, 1.2–1.4 cm long, glabrous, 2-locular; style 5–7 mm long, white pubescent; stigma 1, flattened with a central depression. Disc cylindrical, yellowish, 2.8–3 mm high, margin shallowly dentate. Capsule straight, cylindrical, 3–5 cm long. Seeds oblong, 1.1–1.2 mm long.

Flower season: 

Flowering August to September and fruiting from September to October.

Distribution: 

In VietNam, found in Sa Pa distr., Ta Phin cave, northern Vietnam. Lao Cai, 

Ecological: 

Grows widely scattered on wet ground along road sides or along streams in evergreen broad-leaved forests, at an elevation of 1700–1890 m. 

Reference: 

- theplantlist.org

- efloras.org

- ipni.org

- Chen WH, Nguyen QH, Chen RZ, Nguyen TH, Nguyen VT, Nguyen SK, Möller M, Middleton DJ, Shui Y-M (2018) Two new species of Oreocharis (Gesneriaceae) from Fan Si Pan, the highest mountain in Vietnam. In: Jin X-H, Shui Y-M, Tan Y-H, Kang M (Eds) Plant diversity in Southeast Asia. PhytoKeys 94: 95-106.