e-Flora of Thailand

Volume 16 > Part 2 > Year 2023 > Page 593 > Zingiberaceae > Hedychium

15. Hedychium × muanwongyathiae Picheans. & Wongsuwanwfo-0000917915

(pro sp.), J. Jap. Bot. 84: 330. 2009; Wongsuwan & Picheansoonthon, J. Roy. Inst. Thailand (Thai version) yr. 37 (1): 249. 2012. Plate LXIX: B.


Accepted Name : This is currently accepted.


Description : Terrestrial herb. Leafy shoots 0.7–1.7 m tall; bladeless sheaths 2–4; leaf sheaths green, glabrous to sparsely pubescent; ligule oblong, 2.4–3.5 by 3.3–4.6 cm, green to pale red, apex round to bilobed, membranous, pubescent; blades 7–12, lanceolate-oblong, 38.3–48.5 by 17.8–19.4 cm, glabrous above, pubescent below, base cuneate, apex acuminate-caudate; sessile to petiolate to 2 cm long. Inflorescence a terminal spike, loosely oblong in outline, 21–40 cm long; peduncle 5.5–7.6 cm long, glabrous; bracts green, 16–27, not imbricate, lax to dense, folded, oblong, 4.3–4.5 by 1.4–1.8 cm, apex acute, glabrous, greenish, 2–7-flowered; bracteoles tubular, 1–2.9 by 0.4–1.9 cm, apex acute, membranous, glabrous except ciliate apex. Flowers white to pale yellow with pale pink or salmon red base and flesh-coloured filament, fragrant; ovary 5–6 mm long, glabrous to villous; stigma green, ciliate; epigynous glands 3–4 by 2–3 mm, yellow; calyx 3.9–4.45 cm long, 4–5 mm diam., apex acute to tridentate, ciliate; floral tube 5–7.6 cm long, 2–3 mm diam., pale yellow, corolla lobes linear, 3.6–4.6 by 0.4–0.6 cm, cream-white, apex acute; lateral staminodes linear-oblong to long scimitar-shaped, 4.2–4.6 by 0.4–0.5 cm, base cuneate into 1–1.2 cm long claw, apex acute, inner margin shallowly erose; labellum obovate to depressed-obovate, ca 4.3 by 2.5–2.8 cm, base attenuate into 1–1.6 cm long claw, distally split to ½ of its length, lobes broadly lanceolate to obovate, lobe apex rounded, acute, to narrowly triangular-auriculate, outer margin entire to slightly erose; stamen equal to or a little longer than labellum, orange-red; filament 3.2–3.4 cm long; anther 13–15 by 2–3 mm, orange-yellow. Fruit not seen.


Thailand : NORTHERN: Mae Hong Son (Doi Kio Lom), Chiang Mai (Doi Ang Khang – type: Picheansoonthon & Wongsuwan 064, holotype -BKF, isotype -BK), Doi Chiang Dao, Mae Rim (cultivated), Chiang Rai (Thoen).


Distribution : Known only from N Thailand.


Ecology : Lower montane forests, 1,000–1,500 m alt.


Vernacular : Ta hoen muanwongyat (ตาเหินเหมือนวงษ์ญาติ).


Notes: Hedychium × muanwongyathiae was published as a species, H. muanwongyathiae, but has been shown to be a hybrid between H. spicatum × H. stenopetalum at the Highland-Plant station of Queen Sirikit Botanic Garden in Chiang Mai where H. spicatum grows next to H. stenopetalum. Seed collected from open-pollinated fruits on H. spicatum were germinated and grew into many intermediate forms between their parents, generally matching closely to Hedychium × muanwongyathiae.


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Plate LXVIX: B
Hedychium × muanwongyathiae Picheans. & Wongsuwan