Boesenbergia bosuangii N. F. Lam, 2024

Lam, Nyee Fan, Ibrahim, Halijah, Sam, Yen Yen, Mohammad Zakaria, Rozainah & Poulsen, Axel Dalberg, 2024, Three new species of Boesenbergia (Zingiberaceae) from Sabah, Malaysia, PhytoKeys 247, pp. 39-53 : 39-53

publication ID	https://doi.org/ 10.3897/phytokeys.247.107961
DOI	https://doi.org/10.5281/zenodo.13904246
persistent identifier	https://treatment.plazi.org/id/069BD6E3-BB80-535F-A977-A815C7CE5B34
treatment provided by	PhytoKeys by Pensoft
scientific name	Boesenbergia bosuangii N. F. Lam
status	sp. nov.

Treatment

Boesenbergia bosuangii N. F. Lam sp. nov.

Figs 1 View Figure 1 , 2 View Figure 2

Diagnosis.

The new species resembles B. stenophylla in having a narrowly ovate lamina, but differs in the shape of the bract (linear elliptic vs. cymbiform) and a tubular calyx (vs. tridentate) (Table 1 View Table 1 ).

Type.

Malaysia. Borneo. Sabah. Cultivated at Kipandi Park, Moyog , 05 ° 54.68 ' N, 116 ° 06.27 ' E, 700 m elevation, 8 August 2016, Lam Nyee Fan 356 (holotype BORH!, isotype SAN) GoogleMaps . Original material collected by Linus Gokusing (BS- 23) at Marakau , Gana-gana, Ranau, Sabah, 06 ° 12.24 ' N, 116 ° 46.03 ' E, 480–500 m elevation, 3 August 2010 GoogleMaps .

Description.

Terrestrial, evergreen, herb. Rhizome fibrous, subterranean, ca. 1 cm in diameter with 7 cm internodes, white to light brown, base ca. 0.6 cm in diameter, roots white, up to 18 cm long. Leafy shoots 29.5 cm tall, with 1–2 leaves, with 2–3 outer leafless sheaths, 6.0–6.5 × 0.7–1.1 cm, purple brownish, glabrous. Ligule ca. 0.55 cm long, caudate, brown, glabrous. Petiole 6–7.5 cm long, canaliculate, green, reddish at base. Lamina narrowly ovate, 17–17.4 × 2.5–2.75 cm, erect, dark green above, pale green beneath, glabrous, base attenuate, margin entire, apex acuminate, with acumen ca. 2 mm. Inflorescence ca. 2.8 cm, peduncle 1–2 cm, with up to 6 flowers arranged in a one-sided spiral, one flower open at a time. Fertile bracts linear elliptic, ca. 2.7 cm long, white, reddish at apex, pubescent, margin entire, apex attenuate. Bracteole elliptic, ca. 2 × 0.75 cm, translucent, pubescent, margin entire, apex acute. Flower white, born singly from each bract; calyx 1 cm long, tubular, 2 - lobed, translucent, pubescent on both surfaces; corolla tube ca. 3.6 cm long, ca. 1.5 mm wide at base, lobes white, glabrous throughout, dorsal lobe ovate-oblong, ca. 1.1 × 0.5 cm, linear elliptic, concave, white, glabrous, apex acute, lateral lobes ovate, ca. 1.0 × 0.25 cm, oblong, glabrous, apex rounded; labellum, obovate, ca. 1.2 cm × 0.8 cm curved-backward, longer than corolla lobes, with yellow band from base in the centre spreading towards lip, faint red at base and dark red bands on both sides, glabrous; lateral staminodes white, reddish at base, linear, ca. 0.6 × 0.25 cm, glabrous; stamen white throughout, ca. 0.45 cm long, filament ca. 4 mm × 1 mm (widest at base), pubescent, anther ca. 0.5 × 0.3 cm, glabrous, anther crest ca. 0.5 × 2 mm, bilobed, pubescent, thecae oblong, ca. 0.3 × 0.1 cm, glabrous, dehiscing by pores; ovary ca. 4 × 1.5 mm, stigma cup-shaped, glabrous; epigynous glands, two, ca. 0.45 cm long, linear, apex truncate, white. Fruit not seen.

Distribution.

Endemic to Borneo, Sabah.

Other specimens seen.

Malaysia. Sabah. Telupid District, Taviu Forest Reserves , c. 200 m elevation, lowland forest, 17 May 2001, Sundaling D, SAN 142970 ( SING!, SAN!) .

Etymology.

The species is named after Dr. Steven Bosuang, owner of Kipandi Park. He is an entomologist doing conservation efforts on insects and plants of Sabah. His collaborations with local and overseas scientist produced many research papers and reports for the conservation of Sabah.

Ecology.

Riverine area in mixed dipterocarp forest, 50–300 m elevation, flowering in August.

Conservation status.

Vulnerable VU D 1. Boesenbergia bosuangii is endemic to Sabah. This species is found at Ranau and Telupid Districts. Due to the small, restricted populations outside protected area and possible threats from development, landslides and flooding, this species is assessed as VU (Fig. 3 View Figure 3 ).