Zingiber shuanglongense C.L.Yeh & S.W.Chung

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 : 93-95

Zingiber shuanglongense C.L.Yeh & S.W.Chung

urn:lsid:ipni.org:names:77133995-1

Fig. 13

Journal of Systematics and Evolution 50: 168 ( Yeh et al. 2012), as ʻ shuanglongensis ʼ. Type: TAIWAN – Nantou County • Shuanglung ; 12 Apr. 2008; C.R. Yeh s.n.; holotype: TAIF [ TAIF-156518 ]!.

Additional material examined

TAIWAN – Nantou County • Shuanglung Logging Trail; T.W. Hsu 3301; TAIF • ibid.; Y.C. Lin 1294; TCF • Jenlun logging road; Y.C. Lin 1306; TCF . – Chiayi County • Shihcho to Shihtzulu; T.W. Hsu 5546; TAIF • Dadungshan backbend (huitouwan) ; Y.C. Lin 1292; TCF • Dingshizhao ; Y.C. Lin 1347; TCF . – Kaohsiung County • Tengchih Forest resort area; C.I. Peng 11225; HAST • Terng-Jr ; J.C. Wang et al.7528; TNU • ibid.; S.Z. Yang 7202, 7203, 7185, 9804; PPI • Tengchih ; T.W. Hsu 9861; TAIE • ibid.; S.W. Wu 5084; TAIF • ibid.; S.W. Wu 5084; TAIF • ibid.; Y.C. Lin 1256; TCF • Tengchih National Forest recreation area; T.W. Hsu 14360; TAIE • Mt. Paiyun ; Y.C. Lin 1319; TCF; Hsiaokuangshan logging road; Y.C. Lin 1316; TCF . – Pingtung County • Along Tahan forest road; C.I. Huang et al. 2828; HAST • Forest trail from Ali to Hsiaokueihu; C.C. Liao et al. 636; HAST, TNU • Xiaoguihu ; C.S. Kouh 16039; NCKU, TNM • Tahan forest road; Y.C. Lin 1329; TCF • Aluwan historical trail ; Y.C. Lin 1342; TCF . – Taitung County • Hungshih Logging Trail ; Y.P. Cheng 4381; TAIF • Yanping forest road 11 km; C.H. Chen 6006; TAIE • Lichia Logging Trail ; Y.C. Lin 1338; TCF .

Description

Perennial rhizomatous herbs, 40–70 cm tall. Rhizomes fleshy, weakly aromatic, compacted, densely branched, 0.8–2.7 cm in diameter, brown externally, purplish internally; root tubers terete, distant from the rhizomes, ca 5 × 1.5 cm, brownish externally. Leafy shoots forming dense clumps, spreading, each shoot comprising 7–21 well-developed leaves at flowering. Leaves evergreen, simple, distichous; ligules ca 5 mm long, bilobed, membranaceous, pale green, auriculate; petiole 3−7 mm long, connate a pulvinus; lamina elliptic to narrowly ovate, 12−23 × 2−7 cm, length/ width ratio 2.8−6.7, adaxially green, glabrous, abaxially pale green sometimes flush, pubescent, base cuneate or obtuse, apex acuminate, margin entire, undulate, chartaceous. Inflorescences 1–4 per plant, arising from rhizomes; peduncles 2–8.3 cm long, ascending, glabrous; spike narrowly cylindrical, ca 8–9.3 × 2.0– 2.5 cm, each with 3–8 flowers; fertile bracts greenish-red, lanceolate, 2.3–3.3 × 0.5–1.0 cm, usually red tinged, involute on both sides, apex acute to attenuate, glabrous externally and internally; bracteole lanceolate, 1.7–2.2 × 0.4–0.6 cm, translucent reddish with slight red tinge, apex acute, involute on both sides, glabrous externally and internally. Flowers 6.2–7.3 cm long, much exserted beyond the bracts; calyx tubular, membranaceous, 5–10 mm long, with unilateral incision, translucent. Corolla tube slender, 2.6–3.4 cm long, creamy-white, glabrous externally and internally; dorsal corolla lobe lanceolate, ca 2.5 × 0.7 cm, red, apex acuminate, glabrous; lateral corolla lobes lanceolate, ca 2.3 × 0.6 cm, red, apex acuminate, glabrous; labellum widely obovate, ca 2.9 × 1.9 cm, purple, apex retuse, with scattered cream-white patches at base, glabrous; lateral staminodes narrowly oblong, ca 2.3 × 0.4 cm, connate to labellum at basal ⅓ to ¼, purple, apices obtuse, glabrous. Stamen one; filament ca 2 mm, glabrous; anther connective tissue creamy-white, elongate appendage wrapped around style; anther thecae two, ca 1.1 cm long, longitudinal dehiscence, pollen light yellow; anther crest beak-shaped, ca 1.3 cm long when stretched, purple, apex entire. Style filiform, white, ca 5.6 cm long, extending to the end of anther crest; stigma white, ciliate. Ovary cylindrical, trilocular, ca 5.0 × 2.8 mm, yellowish green, pubescent; epigynous glands two, narrowly conical, ca 5 mm long, pale yellow, apices sharp. Capsule elliptic, dehiscence loculicidal, ca 3.3 × 1.4 cm, usually shorter or as long as the persistent bract, pericarp yellowish-red and red inside. Seed ellipsoid, ca 6.5 × 4.5 mm, enveloped by the aril. Aril white, enveloping ¾ of the length of the seeds.

Phenology

Flowering from August to November and fruiting from October to February.

Distribution

Endemic to Taiwan.

Conservation status

This species was evaluated as Least Concerned (LC) by the Editorial Committee of the Red List of Taiwan Plants (2017).

Notes

According to ICN art. 23.5 ( Turland et al. 2018), the adjective form of the species epithet must agree with the gender of the generic name, and must be corrected when not conforming to this article. Therefore, the gender of the original spelling of ʻ shuanglongensis ʼ by Yeh et al. (2013) did not conform to the neuter gender of ʻ Zingiber ʼ, thus needed to be corrected to ʻ shuanglongense ʼ. Bai et al. (2015b) also made the same correction for this specific epithet.

Figures

Fig. 13. Zingiber shuanglongense C.L.Yeh & S.W.Chung, Shuanglung Logging Trail. 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: L.P. Hsu.