Thursday, June 29, 2017

[Botany • 2017] Monoon vietnamensis • A New Species (Annonaceae) from Central Vietnam

Monoon vietnamensis N.S. Lý

Monoon vietnamensis N.S. Lý, a new species of Annonaceae, is described and illustrated from Mount Dầu, Quảng Ngãi Province, central Vietnam. It is morphologically similar to M. bornensis and M. anomalum, but differs by much larger and oblongelliptic to obovate-elliptic leaves, with 12–14(16) pairs of nerves and a cuneate leaf base; much longer and narrowly ovate to linear ovate petals, with sparsely scattered short hairs outside; inner petals slightly longer than the outer petals; and much longer fruiting pedicels. A key to the species of Monoon in Vietnam is provided.

Fig-1. Monoon vietnamensis (from the holotype).
A: Plant In natural habit. — B: Inflorescences on main trunk. — C: Infructescences on main trunk. — D: Twig. — E: Detail of cymes on woody tubercles. — F: Inflorescence close to base of trunk. — G: Top view of flower. — H: Side view of flower. — I: Old branch with mature leaves. — J: Lower view of sepals. — K, and K2: Top and side views of stamens and carpels. — L: Side view of torus showing sepals, stamens and carpels. — M: Top view of carpels, torus after anthesis. — N: Petals: N1 -outer, N2-inner. — O: Close-up of carpels (alcohol materials). — P: Close-up of stamens (alcohol materials). — Q: Detail of infructes- cence. — R: Fruit (longitudinal-section). — S. Seed (longitudinal-section).
 Scale bars: 10 mm for J, Kv K2, Land M; 1 mm for O and P; 1 cm for R and S. 

Ngọc-Sâm Lý. 2017. Monoon vietnamensis (Annonaceae), A New Species from Central Vietnam. Annales Botanici Fennici. 54(1-3); 153–158. DOI: 10.5735/085.054.0324

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