Quercus baolamensis Binh & Ngoc, 2018

Binh, Hoang Thi, Ngoc, Nguyen Van, Tagane, Shuichiro, Toyama, Hironori, Mase, Keiko, Mitsuyuki, Chika, Strijk, Joeri Sergej, Suyama, Yoshihisa & Yahara, Tetsukazu, 2018, A taxonomic study of Quercus langbianensis complex based on morphology and DNA barcodes of classic and next generation sequences, PhytoKeys 95, pp. 37-70 : 50-51

Quercus baolamensis Binh & Ngoc sp. nov. Fig. 6

Diagnosis.

Quercus baolamensis is most similar to Q. langbianensis s. str., but differs in having the leaf margin regularly distinctly serrate in the upper 1/2 (vs. serrate in the upper 1/3) and shorter petioles 0.4-1 cm long (vs. 1-1.8 cm long).

Type.

VIETNAM. Lam Dong Province: Bao Lam District, B 40 Pass , roadside and edge of evergreen forest, 11°43'37"N, 107°42'34.5"E, alt. 1,000 m, 13 June 2015, with fruits, Ngoc N.V., Binh H.T., Dung L.V., Truong N.K. V 3191 (holotype: KYO!; isotypes: FU!) .

Description.

Tree, 6-8 m tall. Young twigs almost glabrous except near bud, 1-1.2 mm in diam., sometimes sulcate. Old twigs glabrous, brownish-black when dry, lenticellate. Stipules linear, 3-5 mm long, hairy on both surfaces, caducous. Leaf blades elliptic to elliptic-lanceolate or rarely oblanceolate, (5.2-)9-15 × 1.7-4.5 cm, thinly coriaceous, glossy adaxially, pale green abaxially, acuminate at apex, cuneate at base, margin regularly distinctly serrate in the upper 1/2, having 9-12 teeth per side, glabrous on both surfaces; midrib slightly prominent adaxially, prominent abaxially, lateral veins (7-)10-13 pairs, straight and running into the teeth of margin, slightly prominent adaxially, prominent abaxially, at an angle of 40-45 degrees from midrib, tertiary veins scalariform-reticulate, visible on both surfaces; petioles 0.4-1 cm long, whitish hairy when young, glabrescent. Male and female inflorescences not seen. Infructescences axillary or terminal, erect spike, rachis 0.5-1.4 cm long, 1-3 mm in diam., tomentose when young, glabrescent when mature. Mature fruits ca. 2.9 cm high (including cupule), usually 1 (or 2) per infructescence, sessile; cupules obconical, 1.2 cm high, 1.5 cm in diam., enclosing 1/3 of the nut, wall comprising bracts, arranged in 7 rings, margin of rings nearly entire; nut ovoid-ellipsoid, 2.5 cm high, 1.5 cm in diam., apex nearly flat, sparsely hairy except densely appressed hairy around stylopodia, stylopodia up to 4 mm long, basal scar flat, 0.8 cm in diam., glabrous.

Phenology.

Fruiting specimens were collected in June.

Distribution and habitat.

VIETNAM. Lam Dong Province: Bao Lam District. At present, this species is known only from the type locality. Only one individual was found along the roadside and edge of evergreen forest, at 1,000 m altitude.

Etymology.

The specific epithet is derived from the name of its type locality, Bao Lam District.

Figures

Figure 6. Quercus baolamensis Binh & Ngoc. A Leafy twig B Abaxial side of mature leaf C Mature fruit D Inside of cupule E Nut. Materials: A-E from Ngoc et al. V 3191.