Zingiber mioga (Thunb.) Roscoe

Lin, Yuan-Chien, Chao, Chien-Ti, Chang, Chih-Yi & Tseng, Yen-Hsueh, 2022, Taxonomic revision of Zingiber (Zingiberaceae) of Taiwan, European Journal of Taxonomy 839, pp. 74-102 : 85-87

Zingiber mioga (Thunb.) Roscoe

urn:lsid:ipni.org:names:798364-1

Fig. 10

Transactions of the Linnean Society of London 8: 348 ( Roscoe 1807).

Basionym

Amomum mioga Thunberg , Systema Vegetabilium: secundum classes ordines genera species cum characteribus et differentiis. Editio decima quarta: 51 ( Thunberg 1784).

Material examined

TAIWAN – Ilan County • Yingzi Ling roadside; Y.C. Lin 1339; TCF • ibid.; Y.C. Lin 1366; TCF • Mt. Yingtzuting ; T.C. Hsu 9667; TAIF • Yingtzuling ; C.T. Chao 4644; TAIF .

Description

Perennial rhizomatous herb, 60–80 cm tall. Rhizomes fleshy, weakly aromatic, compacted, branched, 0.9–2.9 cm in diameter, brown externally, light yellow internally; root tubers terete, distant from the rhizomes, ca 3.0× 1.5 cm, brownish externally. Leafy shoots forming dense clumps, spreading, each shoot comprising13–16 well-developed leaves at flowering. Leaves deciduous, simple, distichous; ligules ca 3 mm long, bilobed, membranaceous, pale green, auriculate; petiole 8–11 mm long, connate a pulvinus; lamina elliptic, 13–29 × 4–7 cm, length / width ratio 3.3–5.6, adaxially green, glabrous, abaxially pale green, pubescent along the midrib, base cuneate, apex acuminate, margin entire, conspicuously undulate, chartaceous. Inflorescences 2–4 per plant, arising from rhizomes; peduncles 1.5–2.4 cm long, ascending, glabrous; spike ellipsoid, ca 4.2–8.2 × 1.6–3.7 cm, each with 3–7 flowers; fertile bracts greenish-yellow, narrowly ovate, 3.5–4.1 × 0.6–0.8 cm, involute on both sides, apex acute to attenuate, glabrous externally and internally; bracteole narrowly ovate, 1.7–2.5 × 0.6–1.5 cm, translucent greenish, apex acute, involute on both sides, glabrous externally and internally. Flowers 6–8 cm long, much exserted beyond the bracts; calyx tubular, membranaceous, ca 6 mm long, with unilateral incision, translucent. Corolla tube slender, ca 2.5 cm long, yellowish-white, glabrous externally and internally; dorsal corolla lobe narrowly ovate, ca 2.7 × 1.1 cm, yellow, translucent, apex acuminate, glabrous; lateral corolla lobes narrowly ovate, ca 2.2 × 0.7 cm, yellowish, translucent, apex acuminate, glabrous; labellum widely obovate, ca 2.8 × 2.0 cm, yellowish, apex retuse or entire, glabrous; lateral staminodes narrowly oblong, ca 1.6 × 0.5 cm, connate to labellum at ca basal ⅓, yellow, apices obtuse, glabrous. Stamen one; filament ca 2 mm, glabrous; anther connective tissue yellow, elongate appendage wrapped around style; anther thecae two, ca 1.1 cm long, longitudinal dehiscence, pollen light yellow; anther crest beak-shaped, ca 10 mm long when stretched, yellow, apex entire. Style filiform, white, ca 5.6 cm long, extending to the end of anther crest; stigma, white, ciliate. Ovary cylindrical, trilocular, ca 0.6 × 0.3 cm, yellow, pubescent; epigynous glands two, narrowly conical, ca 6 mm long, pale yellow, apices sharp. Capsule ovate, dehiscence loculicidal, ca 2.9 × 1.5 cm, usually shorter than persistent bract, pericarp yellow and orange-red inside. Seed ellipsoid, ca 0.4 × 0.3 cm, enveloped by the aril. Aril white, enveloping ¾ of the length of the seeds.

Phenology

Flowering from July to September. Fruiting from September to October.

Distribution

Distributed in China, Japan, and Korea. In Taiwan, this species was naturalized in Ilan County (see Discussion).

Conservation Status

This species is evaluated as data-deficient (DD) here, due to its uncertain taxonomic status.

Figures

Fig. 10. Zingiber mioga Thunb., Yingzi Ling roadside. A. Habit. B. Leaf adaxial (left) and abaxial (right) surface. C. Ligule. D. Rhizome. E. Inflorescence. F. Flower. G. Bracts. H. Calyx tube. I. Corolla lobes. J. Labellum. K. Stamen and pistil. L. Ovary. M. Fruit. N. Seeds. Photos:A = C.T. Chao; B–N = L.P. Hsu.