Bergera stenocarpa (Drake) F.J.Mou, 2023

Mou, Feng-Juan, Hu, Xiu, Ha, Bui Thu & Cuong, Nguyen Manh, 2023, Taxonomic revision of Bergera J. Koenig ex L. (Rutaceae) based on the molecular phylogeny and morphology, European Journal of Taxonomy 860, pp. 141-180 : 170-171

Bergera stenocarpa (Drake) F.J.Mou , comb. nov.

urn:lsid:ipni.org:names:77314673-1

Fig. 12

Atalantia stenocarpa Drake , Journal de Botanique 6: 277 (Drake del Castillo 1892). – Glycosmis stenocarpa (Drake) Guillemin, Notulae Systematicae (Paris) 2: 158 ( Guillemin 1911). – Chalcas stenocarpa (Drake) Tanaka , Bulletin de la Société botanique de France 75 (4): 711 ( Tanaka 1928). – Murraya stenocarpa (Drake) Tanaka , Blumea 2 (2): 102 ( Tanaka 1936), in obs. – Murraya stenocarpa (Drake) Swingle , Journal of the Washington Academy of Sciences 28 (12): 532 ( Swingle 1938). – Type: VIETNAM • Tonkin; 1885; B. Balansa 1110; lectotype: P[MNHN-P-02441044] image!. Designated here.

Glycosmis bonii Guillemin, Notulae Systematicae (Paris) 1: 214 ( Guillemin 1910). – Type : VIETNAM (INDO-CHINE) • Tonkin , Bac-bat; 15 Sep. 1881; H. F. Bon 798; holotype: P [ P02441050 ] image !.

Etymology

The specific epithet refers to the narrow fruits.

Material examined

VIETNAM • Tonkin ; 1885; B. Balansa 1111, 1112, 1113; P images ! • Lang Son; 4 Apr. 1965; China- Vietnam Expedition 1305; IBSC!, HITBC!, PE image ! • Tonkin occidental; Sep. 1881; H. F. Bon 798; P image ! • Hai Duong, Hoang Hoa Tham ; 2016; F. J. Mou 573; SWFC !.

Description

Small shrub, up to 1.0– 1.5 m high. Branches are grayish brown, short pilose. Leaves unifoliate, rarely 2-foliolate; petiole 3–4 cm, with a swelling at the base of the leaf blade; leaflet blades 8–15 × 3–6 cm, subcoriaceous, shining, elliptical or oblong-lanceolate, acute at the base, narrowed at the apex, rounded to obtuse or retuse to subemarginate, and margin evident teeth or serrate; secondary veins 10–12 pairs, pilose at veins in both sides, midvein slightly ridged; oil glands easily visible principally on the margins and in the angles of the teeth; petiolule of leaflet 5 mm, pilose. Cymes are axillary, 2 cm, (2- or) several flowered; pedicel pilose. Flowers are small; calyxes 5-lobed, short, triangular, and 0.5 mm long; petals 5, white, glabrous, oblong, 3-4 mm, and with pellucid dots on the surface. Stamens are 10, filaments free, 5 long and 5 short, dilated at the base and abruptly pointed at the tip, and pilose. Ovaries are subglobose, glabrous, borne on a low disk, 2-ovuled, and each with 1 ovule. Berries are fleshy, oblong, 15 mm long, 1 cm in diam., shortly attenuated at the tip, and with many evident oil glands; reddish or orange when mature. The species is described based merely on Swingle & Reece (1967) and some images of specimens and plants in Vietnam.

Phenology

Flowering between September to December, while fruiting from March to April (next year).

Distribution and habitat

Vietnam: North Vietnam ( Tonkin), Hai Phong (Cat Ba National Park), Lang Son (Thanh Muoi), Ha Noi (Bat Bat). Distributed on limestone mountains.

Remarks

This species is characterized by the unifoliate leaves, which is familiar to other species Bergera unifolia .

Figures

Fig. 12. Bergera stenocarpa (Drake) F.J.Mou comb. nov. A. Plant. B. Leaves. C–D. Dorsal side of leaf. E. Infructescence. Photos taken by Nguyen Manh Cuong in Vietnam and Feng-Juan Mou.