Magnolia lamdongensis, Vu & Duy & Phan & Tran & Tiep & Xia, 2015

Vu, Tien Chinh, Duy, Nong Van, Phan, Nguyen Huu Toan, Tran, Van Tien, Tiep, Nong Van & Xia, Nianhe, 2015, Additions to the Vietnamese species of Magnolia L., sect. Gwillimia DC. (Magnoliaceae), Adansonia 37 (1), pp. 13-18 : 14-18

Magnolia lamdongensis

V.T. Tran, N.V. Duy & N.H. Xia, sp. nov. ( Figs 2 ; 3 )

M. champacifolia J.E. Dandy ex F. Gagnepain , sp.nov. et M. albosericea Chun & Tsoong affinis, sed folia angustato-ovata, apice longa acutata, glabrescentia, petiolus c. 3 cm longus, pedunculus c. 3 cm longus, juventute papillatus, tepala atque gynoecia glabra .

TYPUS. — Vietnam. Lam Dong Province, Lam Ha District, Phu Son Slope , elevation 1300 m asl, 11°55’05”N, 108°10’04”E, 12. VI.2013, N. V. Duy & V. T. Tran 982 (holo-, Tay Nguyen Institute for Scientific Research – VTN!); iso-, Vietnam National Museum of Nature – VMN, Da Lat University – DLU !).

OTHER MATERIAL EXAMINATED. — Vietnam. Prov. Nha Trang, Ninh Hoa Dist. 17.V.1923, Poilane 6473 (syntype of M. champacifolia ); ibid., versant sud-est du massif de la Mère et l’Enfant, 1500 m alt., 20.V.1923, 6594 (P[P00204037, P00204038]!) [by comparison material from paratypes of M. lamdongensis V.T. Tran, N.V. Duy & N.H. Xia , sp. nov.]. — Typus: China, Hainan, How 72740 (holo-, of M. albosericea, IBSC !) [by comparison material from other species]. DISTRIBUTION, HABITAT. — South Vietnam, Lam Dong Province. Lam Ha district, Phu Son slope and Hon Nga mountain. Growing sparsely scattered in montane evergreen broad-leaved forest, between 1300 and 1500 m asl, associated with species such as Rhodoleia championii Hook. , Castanopsis chinensis (Spreng) Hance , Manglietia chevalieri Dandy , Paramichelia baillonii Hu … So far there are no seedlings and young trees around the mature individuals.

PHENOLOGY. — The plants were flowering and fruiting between May and July.

VERNACULAR NAME. — Dạ họp lâm đồng [magnolia of Lâm đồng]. ETYMOLOGY. — The specific epithet refers to Lâm đồng Province. DESCRIPTION

Evergreen trees, to 4 m tall and 15 cm in stem diam.; bark grayish-brown, rough. Twigs slender 0.3-0.5 cm in diam., young twigs covered with densely grayish-white hairs, old twigs with elevated lenticels; terminal buds grayish-white hairy. Leaves spirally arranged, mature leaf blade rigid and leathery, narrowly ovate, glabrous, 25-35 × 5-8.5 cm; base narrowly cuneate; apex acuminate, c. 2 cm; margins slightly undulate; midvein abaxially prominent, with elevated long lenticels, lateral veins 14-20 on each side, abaxially prominent, reticulate veins dense and prominent on both surface when dry; petiole c. 3 cm long, expanded at base, densely white papillate when young, stipular scar nearly reaching apex of petiole. Peduncle erect, c. 2 × 0.4 cm, 3-4 internodes, densely white papillate. Flower terminal, solitary, ovoid, yellowish-white, 2-2.5 × 1.5- 2 cm; two spathaceous bracts, c. 2.5 cm, densely white papillate outside; pedicel inconspicuous. Tepals 9, all glabrous, in 3 whorls and different from each other; 3 outer tepals obovate-oblong, thin, 1-1.5 × 2-2.5 cm, apex slightly obtuse; 3 middle tepals obovate, thick, 0,8-1.3 × 1.5-2 cm, apex obtuse; inner tepals obovate, thick, 1.2- 1.5 × 0.5-0.8 cm, apex obtuse or slight acute. Stamens in 4-5 ranges, 70-80, unequal, dehiscing introrsely, apex triangular, acute, 8-10 × 1-1.5 mm, scarred into ventral inner tepals ca. 7 mm long. Gynoecium narrowly obovoid to ellipsoid, white, c. 7 × 1 mm, glabrous; stigmas c. 5-6 mm long, reflexed. Ovules 2, irregular with 3 winged-shape and 3 slight deep-set faces, c. 0.7 mm long. Fruit narrowly ellipsoid, 3.5-4 × 1-1.5 cm, carpels 13-15, dorsally dehiscent, glabrous, apex with an outcurved beak 1-3 mm long. Seeds 1-2, seed irregularly polygonal, testa pink, hilum connected to placenta by filiform funiculus, c. 0.8 × 0.4 mm.

REMARKS

This remarkable species is very similar to Magnolia champacifolia J. E. Dandy ex F. Gagnepain , sp. nov. and alboserisea Chun & Tsoong in certain characters, but differs by leaf blades narrowly ovate, glabrous, apex long acuminate, petiole c. 3 cm long, tepals short and glabrous, peduncle c. 3 cm long and densely papillate when young, gynoecium glabrous.

Figures

FIG. 2. — Magnolia lamdongensis T.V. Tien, N.V. Duy & N.H. Xia, sp. nov.: A, leaf blade and venation detail; B, petiole with stipular scar; C, tip of a flowering twig; D, terminal flower with bract; E, terminal flower without bracts; F, anthetical flower; G, spathe; H, outer tepal; I, middle tepal; J, inner tepal; K, floral receptacle and gynoecium; L, fruit aggregate & fruit with seeds; M, 1 upper stamen (left) & 3 lower stamens (right).N. V. Duy & V. T. Tran 982 (holo-, VTN).Drawn by Tran Van Tien. Scale bars: A, B, M, 1.5 cm; E, 1 cm; G, L, 0.8 cm; H, 0.5 cm; I, J, 0.25 cm; K, 1.2 cm.

FIG. 3. — Magnolia lamdongensis V.T. Tran, N.V. Duy & N.H. Xia,sp. nov.:A, habit;B, bark;C, old twigs;D, E, young twigs with terminal bud; F, petiole with stipular scar; G, leaf blades (adaxial and abaxial sides); H, terminal flower with bracts; I, terminal flower without bract; J, flowering twig; K, androecium and gynoecium at the anthesis (top view); L, spathe; M, tepals (right: outer tepal, middle: middle tepal and left: inner tepal); N, stamens (ventral side); O, stamen (dorsal side); P, receptacle and gynoecium; Q, fruit aggregate; R, fruit with seeds. Photos by Nong Van Duy & Tran Van Tien from the type locality.