Three new species of Boesenbergia (Zingiberaceae) from Sabah, Malaysia Author Lam, Nyee Fan 0000-0002-6371-4102 Faculty of Science, University of Malaya, Jalan Professor Diraja Ungku Aziz, 50603, Kuala Lumpur, Malaysia & Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Malaysia Author Ibrahim, Halijah Faculty of Science, University of Malaya, Jalan Professor Diraja Ungku Aziz, 50603, Kuala Lumpur, Malaysia Author Sam, Yen Yen Forest Research Institute Malaysia, Jalan FRIM, 52109 Kepong, Malaysia Author Mohammad Zakaria, Rozainah Faculty of Science, University of Malaya, Jalan Professor Diraja Ungku Aziz, 50603, Kuala Lumpur, Malaysia Author Poulsen, Axel Dalberg 0000-0002-7651-6439 Royal Botanic Garden, Science, 20 A Inverleith Row, Edinburgh EH 35 LR, Scotland, UK text PhytoKeys 2024 2024-10-08 247 39 53 journal article 304364 10.3897/phytokeys.247.107961 3c667f6e-dc7c-4454-adc6-4c8e9802c0f8 Boesenbergia bosuangii N. F. Lam sp. nov. Figs 1 , 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 ). Distinguishing morphological characters of B. bosuangii and B. stenophylla .
Characters B. bosuangii B. stenophylla
Plant height to 30 cm To about 42 cm
Petiole 7.5 cm 10–18 cm
Leaf apex Acuminate Slightly acuminate
Bracts 2.7 cm, linear elliptic, pubescent 4 × 4.5 cm, cymbiform, glabrous
Calyx 2 - lobed, pubescent 3 - lobed, glabrous
Labellum Yellow band from base in the centre spreading towards apex, faint red at base and dark red bands bordering the yellow band, obovate, 1.2 × 0.8 cm White with yellow centre, flabelliform, 2.5 × 2 cm
Lateral corolla lobe White, 1 × 0.25 cm Pale yellow, 1.5 × 0.4 cm,
Boesenbergia bosuangii A habit B spike with one open flower C stamen, ventral view D flower E Bract, bracteole, calyx, epigynous gland, corolla lobes, staminodes, labellum, floral tube with stamen. (Photograph of Lam Nyee Fan 337; Photos: Lam Nyee Fan). 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 ) . 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 . Boesenbergia bosuangii Lam N. F. , sp. nov. A habit B bract C bracteole D calyx E epigynous glands, F spike with one open flower G flower H stamen, ventral view (Drawing by Lam Nyee Fan). Scale bars: 5 cm ( A ); 1 cm ( B, C, D, E, F, G ); 5 mm ( H ). 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 ). Distribution map of Boesenbergia bosuangii , EOO = 0 km 2 , AOO = 8 km 2 ( Bachman et al. 2011 ).