Quercus xuanlienensis
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Ordo: Fagales
Familia: Fagaceae
Genus: Quercus
Name
Quercus xuanlienensis Binh, Ngoc & Bon sp. nov. – Wikispecies link – Pensoft Profile
Diagnosis
Quercus xuanlienensis is morphologically similar to Q. edithiae of China and Vietnam in leaf size (7–15 × 3–5.8 cm), cuneate leaf base, petiole length (1.5–2.8 cm long), number of secondary veins (8–11 pairs), bowl-shaped cupule, ellipsoid to cylindrical-ellipsoid nut and basally convex nut but differs in leaf margin serrulate only at apical 1/5–1/7 (vs. serrate in the upper 2/3), entire bracts of cupule (vs. almost denticulate except basal 2 or 3 rings which is entire), cupule enclosing 1/5 of the nut (vs. enclosing 1/4–1/3 of the nut) and longer nut (5–6 cm long vs. 4–4.5 cm long).
Type
VIETNAM. Thanh Hoa Province, Thuong Xuan District, Xuan Lien Nature Reserve, in evergreen forest around waterfall, alt. 810 m, 19°52'46.7"N, 105°11'34.4"E, 6 Mar. 2017, Binh HT, Ngoc NV, Bon TN V6967 (holotype KYO!; isotypes DLU!, FU!, P!, VNM!).
Description
Tree, ca. 18 m tall. Buds ellipsoid, ca. 9 mm long, ca. 4 mm in diam., scales imbricate, in 4–5 rows, ovate-triangular, ca. 3 × 2.5 mm, apex obtuse, margin ciliate, appressed whitish to yellowish brown hairy on both surfaces. Twigs glabrous when old, lenticellate. Stipules linear-lanceolate, 10–14 mm long, densely appressed hairy, glabrescent outside, glabrous inside. Leaves alternate; blade leathery, oblong-elliptic or obovate, (6–)8–11(–15) × 3–4.5(–5) cm, apex acuminate, acumen up to 0.6 cm long, base cuneate, margin recurved, serrulate in the upper 1/5–1/7, pale brown on the upper surface, yellowish brown to reddish brown on the lower surface when dry, glabrous on both surfaces; midribs ±flat on upper surface, prominent and distinct on lower surface, lateral veins 8–11 pairs, prominent on lower surface, at an angle of 40–45 degrees from midrib, straight and running into the margin, tertiary veins scalariform, indistinct on upper surface, prominent and distinct on lower surface; petioles 1–2 cm long, glabrous. Male and female inflorescences not seen. Infructescences axillary or terminal, erect, rachis 8–10 mm long, 4–5 mm in diam., glabrous, brownish red when fresh, blackish when dried. Fruits 6–6.5 cm high (including cupule), solitary or twin, sessile; cupules bowl–shaped, 1.3–1.7 cm high, 1.9–2.1 cm in diam., enclosing ca. 1/5 of the nut when mature, outside whitish to yellowish brown tomentose to glabrous, inside densely appressed yellowish brown hairy, wall ca. 1–2 mm thick, comprising of bracts, bracts arranged in 7–8 rings, margin of rings entire; nuts ellipsoid to cylindrical-ellipsoid, 5–6 cm high, 2–2.3 cm in diam., apex acute, densely appressed yellowish brown hairy around stylopodia, with stylopodia up to 4 mm long, basal scar 9–10 mm in diam., convex, to 3 mm high, glabrous.
Distribution
Vietnam. Thanh Hoa Province, Thuong Xuan District, Xuan Lien Nature Reserve.
Ecology in Vietnam
At present, only one individual was found in evergreen forest, at 810 m altitude.
Etymology
The specific epithet is derived from the district name of the type locality, Xuan Lien Nature Reserve, Thuong Xuan District, Thanh Hoa Province, North Central Coast of Vietnam.
Phenology
Fruiting specimens were collected in March.
GenBank accession no
Binh et al. V6967: LC331257 (rbcL), LC331254 (matK).
Preliminary conservation status
Quercus xuanlienensis is known for only one individual inside the protected area of Xuan Lien Nature Reserve. According to the criterion D of the IUCN Red List criteria (IUCN 2012[1]), this species is qualified as Critically Endangered (CR).
Original Description
- Binh, H; Ngoc, N; Bon, T; Tagane, S; Suyama, Y; Yahara, T; 2018: A new species and two new records of Quercus (Fagaceae) from northern Vietnam PhytoKeys, (92): 1-15. doi
Images
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Other References
- ↑ IUCN (2012) IUCN Red List Categories and Criteria: Version 3.1. Second edition. Gland, Switzerland and Cambridge, UK. http://jr.iucnredlist.org/documents/redlist_cats_crit_en.pdf [accessed 10 December 2017]
