Oreocharis glandulosa Y.H.Tan & J.W.Li, 2013

Tan, Yun-Hong, Li, Jian-Wu, Pan, Bo, Wen, Bin, Yin, Jian-Tao & Liu, Qiang, 2013, Oreocharis glandulosa, a new species of Gesneriaceae from southern Yunnan, China, Phytotaxa 131 (1), pp. 29-34 : 30-33

Oreocharis glandulosa Y.H.Tan & J.W.Li , sp. nov. ( Fig. 1–2 ).

Species Oreocharis bodinieri affinis , sed corolla dense indumento pedunculi obtectae extra, limbo distincte bilobata, adaxial labio bilobata ad prope basim; stamina includitur; antherae connectiva glabro; disco annularis similis, glaber, integris vel subintegro differt.

Type:— CHINA. Yunnan: Lancang , shady humus-rich hillsides and damp rocks under evergreen broad leaved forests, 1600m, 22° 35' 28.17" N, 99° 58' 55.92" E, 7 September 2012, Yun-Hong Tan 6925 (holotype HITBC!, isotype HITBC!) .

Perennial, stemless herbs. Rhizomes subterete, 1.8–2.0 cm long, 1 cm in diameter. Leaves basal, 8–13, petiolate; petioles terete, 3–13 cm long, 2–4 mm in diameter, densely villous with brown segmented hairs, ca. 3–4 mm; leaf blades papery when dry, cordate to broadly ovate, 3.5–11.5 × 2.5–9.0 cm, bases cordate, margins double crenate to serrate, apices acute to rounded, adaxially densely appressed pubescent, abaxially densely brown villous along veins, hairs ca. 3–4 mm; lateral veins 6–7 on each side of midrib, distinct, concave adaxially, prominent abaxially. Inflorescences cymose, axillary, 3–4-branched, 4–16(–20)-flowered; peduncles 7.0– 19.5 cm long, ca. 2 mm in diameter, with densely brown segmented hairs, ca. 3–4 mm; bracts 2, ca. 3–5 × 1.0– 1.2 mm, narrowly lanceolate to lanceolate, margins entire, with densely brown segmented hairs outside, hairs ca. 2–3 mm; bracteoles similar but smaller; pedicels 0.8–2.3 cm long, ca. 1 mm in diameter, with densely brown segmented hairs, hairs ca. 2–2.5 mm. Calyx actinomorphic, 4.5–6.5 × ca. 1.0 mm, 5-parted nearly to the base, slightly unequal, lobes linear-lanceolate, with densely brown segmented hairs outside and glabrous inside, margins entire or 2–3-denticulate. Corolla yellow 2.0– 2.5 cm long, outside densely glandular puberulent and inside glabrous; tube nearly cylindric, gradually slightly ampliate from base to mouth, 1.5–1.8 cm × ca. 4.0– 5.5 mm; limb distinctly two-lipped, adaxial lip bilobed to near base, lobes ovate to triangular-ovate, ca. 3.5–4.0 × 3.0– 3.5 mm; abaxial lip trilobed to base, lobes ovate, ca. 6.0–6.5 × 4.0– 4.5 mm. Stamens 4, adnate to corolla 4.5–5.0 mm above base, included; filaments ca. 13.5–14.5 mm long, slender, sparsely pubescent, free; anthers oblong, ca. 1.5–2.0 × 0.8–1.0 mm, two-loculed, dehiscing longitudinally, connective glabrous; staminode 1, glabrous, ca. 3.0– 3.5 mm long, adnate to corolla 4 mm above base. Disc ring like, ca. 2.0– 2.5 mm high, glabrous, entire or subentire. Pistil ca. 1.2–1.9 cm, glabrous; ovary ca. 1.2–1.6 cm long, ca. 1 mm in diameter, style ca. 2 mm long; stigma 1, capitate, orbicular, ca. 0.8–1.0 mm in diameter. Capsules 4-angled or subterete, ca. 4 cm long and 3 mm in diameter, glabrous.

Distribution, habitat and ecology:— Oreocharis glandulosa is only known from southern Yunnan and grows on shady, humus-rich hillsides and rocks in the understory of evergreen broad leaved forests or on valley cliffs, elevation ca. 1600–1800 m. The main companion species are: Rhynchanthus beesianus W.W.Sm. , Hedychium spicatum Smith , Peristylus calcaratus (Rolfe) S.Y.Hu , Begonia palmata D.Don , Sonerila primuloides C.Y.Wu ex C.Chen , Anthogonium gracile Lindl. , Tofieldia thibetica Franch. , Lobelia angulata G.Forst.

Phenology:— Flowering from August to October and fruiting from September to November.

Etymology:— The epithet refers to the corolla which is densely glandular puberulent outside.

Relationships:— Oreocharis glandulosa is most similar to Oreocharis bodinieri Léveillé (1915: 40) distributed in southern Sichuan and northeastern Yunnan, but can be distinguished by its corolla that is densely glandular puberulent outside (vs. pubescent), the distinctly two-lipped limb (vs. slightly 2-lipped), the adaxial lip bilobed to near the base, abaxial lip trilobed to the base (vs. bilobed from near middle), included stamens (vs. slightly exserted), anther connectives glabrous (vs. sparsely pubescent to pubescent), and an entire or subentire disc (vs. deeply pentalobed to pentasect from base). After comparison with specimens and literature of Oreocharis bodinieri , we concluded that O. glandulosa can be clearly differentiated from O. bodinieri by several floral characters as listed in Table 1.

Additional specimens examined (patatypes):— CHINA. Yunnan: Lancang County, Fofang, 28 August

2011, Jian-Wu Li 880 (HITBC); 25 July 2001, Hong Wang 4914 (HITBC).

Figures

FIGURE 1. Oreocharis glandulosa (from the type locality). A, B. Habitat. C. Flower. D. Opened corolla showing stamens. E. Opened corolla, calyx and pistil with disc. F. Calyx. G. Young fruit with disc. Photographs by Yun-Hong Tan & Jian-Wu Li.

FIGURE 2. Oreocharis glandulosa. A. Habitat. B. Flower. C. Opened corolla. D. Calyx and pistil with disc. E. Calyx. F. Bracts. G. Cross section of ovary. Illustration by Yun-Xi Zhu based on the holotype.