Amomum yingjiangense S.Q. Tong & Y.M. Xia, 1988

Ding, Hong-Bo, Yang, Bin, Maw, Mya Bhone, Win, Pyae Pyae & Tan, Yun-Hong, 2020, Taxonomic studies on Amomum Roxburgh s. l. (Zingiberaceae) in Myanmar II: one new species and five new records for the flora of Myanmar, PhytoKeys 138, pp. 139-153 : 139

Amomum yingjiangense S.Q. Tong & Y.M. Xia Fig. 2

Amomum yingjiangense S.Q. Tong & Y.M. Xia in Acta Bot. Yunnan. 10(2): 210. 1988; S.Q. Tong in C.Y. Wu (ed.), Fl. Yunnan. 8: 622. 1997; T.L. Wu & K. Larsen in C.Y. Wu & P.H. Raven (eds), Fl. China 24: 349. 2000; De Boer et al. in Taxon 67(1): 20. 2018. Type: China, Yunnan Province, Dehong Dai and Jingpo Autonomous Prefecture, Yingjiang County, Xima Town, Huoshigou Village, 1740 m elev., 8 August 1983, S.Q. Tong & C.J. Liao 24870 (holotype: HITBC081571!)

Description.

Clump-forming herb, 1-1.5 m tall, 3-7 pseudostems per clump. Pseudostem with 2-7 leaves per pseudostem, swollen and brownish yellow at base, greenish yellow towards apex; ligule ovate, entire, apex rounded, sometimes truncate or praemorse because of fragile, 5-13 mm long, densely brownish pubescent; petiole absent to 4 cm, densely brownish pubescent; leaf blade adaxially dark green, abaxially green, elliptic to narrowly elliptic, 35-65 × 5-11 cm, adaxially pubescent, abaxially densely brownish pubescent, base cuneate or attenuate, apex caudate. Inflorescence radical, 10-17 cm, arising from the rhizome, 1 inflorescences per pseudostem, peduncle short, 2-4 cm, reddish-brown, flowering part obovoid, ca. 11 × 10 cm, sterile bracts ovate, 2.5-5.5 × 2.0-4.5, reddish brown, carneous, fragile; bracteoles, non-tubular, lanceolate, 3.0-3.5 × 0.5-0.8 cm, reddish brown, carneous, fragile, subtending 1-2 flowers. Flowers 5-6 cm, white or pinkish orange. Calyx tubular, 2.3-3.0 × 0.5-0.9 cm, apex 3-toothed, membranous, white or pinkish orange, pubescent. Floral tube 2.3-2.7 cm long, ca. 0.5 cm wide at mouth, white or pinkish orange, pubescent; dorsal corolla lobe oblong, 2.2-2.5 × 0.8-1.0 cm, white or pinkish orange, hooded at apex, obtuse, ciliate; lateral corolla lobes oblong, 2.0-2.5 × 0.5-0.8 cm, white or pinkish orange, apex rounded, ciliate. Labellum spreading, obovate, white or pinkish orange with reddish stripe (by reddish dots) radiating towards apex, 2.5-3.0 × 1.5-2.0 cm, apex trilobed or inconspicuous trilobed, margin crisped or dentate, prominently veined, adaxial surface pilose at base. Lateral staminodes ovate, sometimes dentate, adaxial surface reddish, abaxial surface white or pinkish orange, 5-7 mm. Stamen 2.0-2.3 cm long, filament ca. 8 × 3 mm, white or pinkish orange, pubescent, connective pubescent, white or pinkish orange, anther thecae oblong, ca. 1.0 cm long, brownish yellow, dehiscing throughout their length, anther crest reniform or inconspicuous trilobed, ca. 7 × 3 mm, apex crenate or entire, white or pinkish orange, membranous. Epigynous glands 2, cylindrical, ca. 4 × 1 mm, creamy, glabrous. Ovary ellipsoid, ca. 5 × 3 mm, reddish brown, glabrous; style ca. 5.0 cm long, white, glabrous; stigma cup-shaped, reddish brown, mouth ciliate. Capsule not seen.

Specimens examined.

Myanmar, Kachin state, Putao district, Pannandin, top of mountain, understory herbs in tropical rain forest, 27°42'15.06"N, 97°52'57.88"E, 1769 m elev., flowering, 9 June 2018, Myanmar Exped. M4262 (HITBC!; RAF!).

Distribution.

China, Myanmar.

Note.

This species was originally described by Tong and Xia (1988) from fruiting material only and recorded as endemic to China ( Tong 1997, Wu and Larsen 2000). In Ye (2018), he re-described the species with flowering material from the type locality. Here, we also provide a description from Myanmar.

Figures

Figure 2. Amomum yingjiangense S. Q. Tong & Y. M. Xia A habit B ligule C leaf blade abaxially D inflorescence (front view) E inflorescence (side view) F flower (side view) G flower showing lateral staminodes H single flower showing anther crest (front view) I single flower showing stamen (back view) J bracteole K calyx L dorsal corolla lobe M lateral corolla lobes N labellum with floral tube and lateral staminodes O stamen (back view) P stamen (front view) Q ovary with epigynous glands, style and stigma R lateral staminodes. Photographed by H. B. Ding.