A new species, Curcuma tuanii (Zingiberaceae), is described and illustrated from Hoa Binh Province northern Vietnam based on both the morphological and molecular data. The species is morphologically compared with its closest allies from subgenus Ecomata. Additionally, the anatomical structures of the species were provided.
Keywords:
Flora of tropical Asia; Curcuma subgen. Ecomata; medicinal plants; Zingiberaceae; Vietnam
| Characters | C. tuanii | C. sahuynhensis (Leong-Škorničková et al. 2015bLeong-Škorničková J, Ly NS, Nguyen QB. 2015b. Curcuma arida and C. sahuynhensis, two new species from subgenus Ecomata (Zingiberaceae) from Vietnam. Phytotaxa 192: 181-189. ) | C. vitellina (Leong-Škorničková et al. 2010Leong-Škorničková J, Tran HD, Newman MF. 2010. Curcuma vitellina (Zingiberaceae), a new species from Vietnam. The Gardens' Bulletin, Singapore 62: 111-117.) | C. pambrosima (Leong-Škorničková & Ly 2010Leong-Škorničková J, Ly NS. 2010. Curcuma pambrosima sp. nov. (Zingiberaceae) from central Vietnam. Nordic Journal of Botany 28: 652-655.) | C.cotuana (Luu et al. 2017Luu HT, Tran HD, Nguyen TQT, Leong-Škorničková J. 2017. Curcuma cotuana sp. nov. (Zingiberaceae: Zingibereae) from central Vietnam. Nordic Journal of Botany 35: 552-556.) |
|---|---|---|---|---|---|
| Habit | Up to 100 cm tall | Up to 60 cm tall | 70 cm | 80 cm | Up to 50 cm tall |
| Petiole | Up to 40 cm long | Up to 24 cm long | 5-20 cm | 5-25 cm | Up to 20 cm |
| Lamina | Oblong | Ovate to elliptic | elliptic to elliptic-ovate | elliptic-lanceolate | Ovate to elliptic |
| Spike (cm long, number of bracts) | 13-17 cm long, composed of 25-50 bracts | 6-15 cm long, composed of 10-23 bracts | 8-15 cm long, 15-60 bracts | 10-25 cm, 7-34 bracts | 5-9 cm long, composed of 16-24 bracts |
| The bract color | Orange-red | Orange-red | Cream white | pinkish | Orange-red |
| The number of bracts: the length of the spike | 1.92-2.94 | 1.53-1.67 | 1.88-4 | 0.7-1.36 | 2.66-3.20 |
| corolla lobe | Orange-red | Orange-red | Cream white | pinkish | Orange-red |
| Lateral staminodes | 18-21 × 11-13 mm | 15-22 × 15-18 mm | 18 × 11 mm | 12-15 × 8-10 mm | 20-22 × 5-6 mm |
| Labellum | incision extending more than 1/2 of the length of the labellum | incision extending less than 1/3 of the length of the labellum | incision extending less than 1/3 of the length of the labellum | incision extending 1/3 to 1/2 of the length of the labellum | incision extending less than 1/3 of the length of the labellum |
| Anther | 10-11 mm long, yellow, L-shaped | 7-8 mm long, yellow, L-shaped | 4-6 mm long, yellow, oblong | 8-9 mm, cream white, oblong | ca. 12.5 mm long, yellow, weak L-shaped |
| Anther spurs | 3-3.5 mm long, parallel with apex outward-facing | 3.5-5.0 mm long, parallel with apex outward-facing | 0.5 mm long, filamentous | 1.5 mm long, curved inwards | Each with a blunt knob positioned below thecae and extending into the acute apex |
| Anther crest | 1.0-1.5 mm long, entire rounded apex | Reduced 0.3-1.0 mm long, emarginate apex, | 1-1.5 mm long, Rounded apex | 1.5 mm long, rounded | 1-1.2 mm long, emarginate apex |
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail