MAGNOLIA HUONGIANA (M. sect. Michelia, Magnoliaceae), A NEW SPECIES FROM SOUTHERN VIETNAM

Thi Viet Nga Cao^1,2,6, Tien Chinh Vu^3,7, Quang Cuong Truong^4,8 & The Trung Luu^5,9 & Quang
Nam Vu^1,10*

¹College of Forestry Biotechnology, Vietnam National University of Forestry, Xuan Mai, Hanoi, Vietnam
²Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
³Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, Hanoi, Vietnam
⁴Bidoup Nui Ba National Park, Da Nhim, Lam Dong, Vietnam
⁵Forest Science Institute of Central Highlands and South of Central Vietnam, Vietnamese Academy of Forest Sciences, Hanoi, Vietnam
⁶caovietnga.cnsh@gmail.com; https://orcid.org/0009-0008-2366-7023
⁷tienchinhvu@gmail.com; https://orcid.org/0000-0002-5014-8500
⁸quangcuongvqg@gmail.com; https://orcid.org/0000-0001-9159-1018
⁹luutrung379@gmail.com; https://orcid.org/0009-0005-0901-4083
¹⁰namvq@vnuf.edu.vn; https://orcid.org/0000-0002-8044-7923
^*Author for correspondence

Abstract

Magnolia huongiana is most similar to M. braianensis but differs in its dense, ferruginous brown hairs on young twigs, petioles, terminal buds, brachyblasts vs. dense yellowish blonde hairs; stipular scar reaching apex of petiole vs. completely free from petioles; more numerous spathaceous bracts 2–3, cylindrical fruits vs. obovoid to subglobose syncarpous fruits. Evergreen trees, to 18 m tall and 35 cm dbh. Bark slightly fissured, gray outside and yellowish inside. Young twigs, petioles and elongate densely ferruginous brown hairs on terminal buds. Twigs slender, internodes 7–15 × 3–5 mm, dotted with small lenticels. Stipular scar reaching apex of petiole. Leaves evenly distributed, spirally arranged, ferruginous brown (especially on abaxial midrib) on both surfaces of young leaves, becoming glabrous, shiny on mature leaves; petioles 15.0–18.0 × 2.0 mm, 3.0–5.0 mm thickened towards the base; leaf blades elliptic, (8.0–)11.0–15.0 × (2.5–)4.0–5.0 cm, base cuneate and gradually attenuate into petiole, apex acuminate to acute, acumen 0.3–0.5cm long; midrib and secondary veins abaxially prominent, secondary veins 13–16 on each side of the midrib, meeting in intramarginal veins ca 0.3–0.5 cm from the entire margin, reticulate veins dense and abaxially prominent when dry. Flower buds broadly ovoid to ellipsoid, 1.0–1.5 × 0.5–0.8 cm, ferruginous brown hairs outside. Flowers axillary, solitary; tepals 12–15, subsimilar, oblanceolate, cream white to yellowish (sometimes light green), glabrous, 2.3–2.8 × 0.3–0.6 cm, tepals of inner whorls slightly smaller. Stamens ca. 34, subequal, creamy white, 0.8–1.0 cm long, glabrous.

Sources: Phytotaxa 683 (2): 165-170

Link: https://doi.org/10.11646/phytotaxa.683.2.7

FIGURE 1. Magnolia huongiana. A. Habitat of M. huongiana. B. Habit, with inset showing bark (lower left). C. Branch apex with adaxial view of leaves, stipular scar reaching apex of the dense ferruginous brown hairs on petiole, and multi-tepals of axillary, solitary flower. D. Flower with dense ferruginous brown hairs on brachyblast and green tepals. E. A view of one flower and scars of petioles. F. Gynoecium terete, protruding from androecium. G. Gynoecium with numerous carpels, the gynophore, and scars of tepals and stamens. H. Subsimilar tepals and stamens of a flower. I. A ripe fruit. J. Seeds.