Monday, June 28, 2021

[Botany • 2021] Zingiber magang & Z. tamii (Zingiberaceae) • Two New Species from central Vietnam


 Zingiber tamii N.S.Lý & Škorničk.

in Ly, Do, Cao, ... et Leong-Skornickova, 2021. 

Zingiber magang and Z. tamii, two new species of Zingiber sect. Cryptanthium (Zingiberaceae) from central Vietnam are described and illustrated. Information on their distribution, ecology, phenology, uses and vernacular names are provided. A preliminary IUCN conservation assessment of each of these species is proposed. A key to species of Zingiber sect. Cryptanthium in Vietnam is also given.

Keyword: Annamite range, endemic species, monocots, taxonomy, Zingiber sect. Cryptanthium

Fig. 2. Zingiber magang N.S.Lý & Škorničk. 
A. Habit. B. Detail of pseudostem. C. Basal part of the plant with an inflorescence. D. Inflorescence with flowers (top view). E. Fertile bract (basal part of the inflorescence), flower enclosed in fertile bract (middle part of the inflorescence), bract, bracteole. F. corolla lobes, labellum, ovary with floral tube and stamen (calyx removed), calyx. G. Stamen from side and front view, ovary with epigynous glands. H. Young fruit from outside and when open with young seed in between.
Photos Ngọc-Sâm Lý from the type Lý-1327.

Fig. 1. Zingiber magang N.S.Lý & Škorničk. 
A. Habit. B. Basal part of the plant with an inflorescence. C. Inflorescence with a flower (side view).
Photos Ngọc-Sâm Lý from the type Lý-1327.

Zingiber magang N.S.Lý & Škorničk. sp. nov. 

 Zingiber magang is rather distinct from its congeners by combination of leafy shoots composed of only 3–5 prominently petiolate leaves with weakly plicate and somewhat shiny leathery laminae, and inflorescences with basal part of basal bracts convex and slightly inflated giving it somewhat bullate appearance. 

Vernacular names and uses: This species is locally known as magang (Kinh minority), Pagieng or Pagang (Co, Ca Dong and Hre minorities). Rhizomes of this species are harvested, crushed and applied for healing wounds and bone fractures. 

Etymology: The specific epithet “magang” is derived from the common name applied to this species by local people from Kinh tribe in Quảng Ngãi province


Fig. 4. Zingiber tamii N.S.Lý & Škorničk.
A. Basal portion of flowering plant showing rhizome, inflorescence and leafless sheaths. B. Fertile bracts (external and internal view), bracteole, flower in side view with bracteole attached. C. Flowerin side view with calyx removed. D. Flower dissection (from left): floral tube with ovary and stamen attached (calyx removed), ovary with epigynous glands, calyx, dorsal corolla lobe, two lateral corolla lobes, labellum with basally connate lateral staminodes
 Photos Ngọc-Sâm Lý from the type Lý-1323.

Fig. 3. Zingiber tamii N.S.Lý & Škorničk.
A. Plant habit. B. Leaves and petioles. C. Inflorescence with a flower (side view). D. Inflorescence with a flower (semi-top view).
Photos Ngọc-Sâm Lý from the type Lý-1323.

Zingiber tamii N.S.Lý & Škorničk. sp. nov. 

 Similar to Z. vuquangense N.S.Lý et al. by overall similarity in leafy shoots consisting of prominently petiolate, broadly elliptic and prominently plicate laminae, but differs by overall smaller size 0.5–0.7 m, shorter ligules 3–5 mm long, smaller abaxially glabrous laminae 15.8–21.5 × 7.5–9.5 cm, narrowly ovate bracts, shorter calyx 10–12 mm long, pale yellow and externally sparsely puberulous corolla lobes, pale yellow lateral staminodes and ovate to elliptic ovate very dark purple labellum with small yellow blotches and yellow margin (compared to larger size 1.2–1.8 m, ligules 12–30 mm long, larger laminae abaxially densely pubescent along midrib 26–50.8 × 9–14.7 cm, oblong to club-shaped bracts, longer calyx 17–18 mm long, bright yellow and glabrous corolla lobes, lateral staminodes yellow with pink purple apex and obovate pink-purple labellum with pale yellow spots in Z. vuquangense).  

Distribution and habitat: Near streams and in the moist and shady understorey of primary and secondary tropical broadleaved forests between 520–930 m elevation. 

 Eponymy: This species is named in honour of Mr. Trương Quang Tâm, a forestry engineer at Institute of Tropical Biology.

Ngọc-Sam Ly, Dang-Giap Do, Ngọc-Giang Cao, Ba-Vuong Truong, Van-Thanh Nguyen and Jana Leong-Skornickova. 2021. Zingiber magang and Z. tamii (Zingiberaceae), Two New Species from central Vietnam. Taiwania. 66(2); 232‒240.