Two new species of Boesenbergia (Zingiberaceae), from Sabah, Malaysia Author Lam, Nyee Fan 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, Kuala Lumpur, Selangor Malaysia Author Mohammad Zakaria, Rozainah Faculty of Science, University of Malaya, Jalan Professor Diraja Ungku Aziz, 50603, Kuala Lumpur, Malaysia rozainah@um.edu.my Author Poulsen, Axel Dalberg Royal Botanical Garden, Arboretum PI, Edinburgh, EH 3 5 NZ, UK text PhytoKeys 2022 2022-10-17 211 81 92 http://dx.doi.org/10.3897/phytokeys.211.83985 journal article http://dx.doi.org/10.3897/phytokeys.211.83985 1314-2003-211-81 EF068789DCDE54F5852590D25BD6126F Boesenbergia sugudensis N.F.Lam sp. nov. Figs 1 , 2 Diagnosis. The new species resembles B. imbakensis S. Sakai & Nagam. in that the leaf sheaths are not thickened and in the anther thecae dehiscing longitudinally, but differs in having a longer petiole (>10 cm vs. 4-7.5 cm) and bilobed apex of calyx (vs. trilobed) (Table 1 ). Table 1. Distinguishing morphological characters of Boesenbergia sugudensis , B. imbakensis , B. truncata and B. orbiculata .
Characters Species
B. sugudensis B. imbakensis B. truncata B. orbiculata
Plant height (cm) 44 30 11.5 8
Rhizome Fibrous Small Fibrous, sections of rhizome with 1-2 cm long and papery texture bracts Unknown
Ligule 0.4 cm, caudate, brownish green, glabrous 1 cm, triangular, green, glabrous 0.3 cm, entire, light brown, glabrous 2 cm, bilobed, lobes rounded, glabrous
Petiole 22.5 cm, green, base reddish up to middle part 4-7.5 cm, green, base reddish up to middle 2 cm long, green, base reddish up to middle part 2 cm
Lamina Elliptic, upper surface dark green, lower surface paler Narrowly ovate to obovate, plain green Elliptic, unequal/oblique?, upper surface dark green, lower surface lighter green sub-orbiculate, upper surface pale green, lower surface light green
Leaf size (cm) 21 x 7.3 11-16 x 3-4 5.2-6.5 x 3.4-3.6 5-8 x 4-7
Leaf base Rounded Attenuate Truncated to sub-cordate Sub-cordate
Leaf apex Acuminate, acumen ca. 3 mm Slightly acuminate, acumen ca. 1-2 mm Acute, acumen ca. 1 mm Sub-obicular, obtuse or occasionally shallowly emarginate
Bracts 6.5 cm, translucent white, linear elliptic, glabrous 2.6 x 0.4 cm, narrowly ovate, membranous 1.8 x 3 cm, white, narrowly ovate, pubescent 2.5 cm, boat-shaped, whitish brown, sparsely pubescent,
Calyx Tubular, apex bilobed, glabrous Tubular, apex unequally and shallowly 3-lobed, glabrous Tubular, apex bilobed, pubescent Unilaterally split, apex bilobed
Labellum White with narrow light red band from base until the middle, yellow spread towards the lip, 1.3 x 1 cm White with yellow on the centre and red at the throat, 1.8 x 1.4 cm White with yellow band at base in the middle, spread towards lip, 0.6 x 0.5 cm White with deep yellow in the centre and a red mark at the base, 1 x 1 cm
Lateral corolla lobe Glabrous, white, 1.7 x 0.3 cm, ovate, apex rounded, longer than labellum Glabrous, white, 1.4 x 0.4 cm Pubescent, white, 0.3 x 0.1 cm 1 cm long
Anther Upper and lower surfaces pubescent, 0.6 cm Glabrous on ventral, shortly pubescent on the dorsal surface, 0.6 cm Glabrous, 0.4 cm long Slightly pubescent, 0.4-0.5 cm
Anther dehiscent Slit Slit Pore Slit
Stigma Cup-shaped, white, glabrous Unknown Emarginate, white, glabrous Shape and colour unknown, glabrous
Figure 1. Boesenbergia sugudensis A habit B rhizome and roots C spike with one open flower D flower E bracteole, calyx, corolla lobes, staminodes, labellum, floral tube with stamen F stamen, ventral view (Photographed by Lam Nyee Fan). Type . Malaysia . Borneo. Sabah . cult. at Kipandi Park , Moyog , 05°54.68'N , 116°06.27'E , 700 m elevation, 12 October 2016 , Lam Nyee Fan 356 ( holotype BORH!, isotype SAN). Original material collected by Linus Gokusing (BS-23) at Kampung (Kg.) Sugud , Penampang , Sabah , 05°50.23'N , 116°06.60'E , 50-100 m elevation . Figure 2. Boesenbergia sugudensis Lam N.F., sp. nov. A habit B bract C bracteole D calyx E flower F spike with one open flower G stamen, ventral view (Drawing by Lam Nyee Fan). Scale bars: 5 cm ( A ); 1 cm ( B, C, D, E, F ); 5 mm ( G ). Description. Terrestrial, evergreen, herb. Rhizome fibrous, subterranean, ca. 0.8 cm in diameter, base ca. 1.5 cm in diameter, roots white. Leafy shoots 44 cm tall, with 2-3 leaves forming a loose pseudostem, erect, ca. 13 cm long, with 2-3 outer leafless sheaths, 3.9-12.5 x 0.8-1.25 cm, green, pubescent on outer surface and glabrous on inner surface, veins 1 mm apart. Ligule ca. 0.4 cm long, caudate, brownish green, glabrous. Petiole 12-22.5 cm long, canaliculate, green, reddish in lower half. Lamina elliptic, 20-22 x 6.5-7.5 cm, erect, dark green above, pale green beneath, glabrous above, pubescent beneath, base rounded, margin entire, glabrous, apex acuminate, with acumen ca. 3 mm. Inflorescence ca. 4.7 cm, peduncle 0.8 cm, spike ca. 7.2 x 3 cm. flowers arranged in one-sided spiral, 18 flowers including 5 new buds and 4 old buds, one flower open at a time. Fertile bracts linear elliptic, ca. 6.5 cm long, translucent pubescent on outer surface and glabrous on inner surface, margin entire, apex attenuate. Bracteoles elliptic, ca. 3.8 x 0.8 cm, translucent, pubescent on outer surface and glabrous on inner surface, margin entire, apex acute. Flower white, born singly from each bract and bracteole; calyx 1 cm long, tubular, 2-lobed, translucent, pubescent on both surfaces; corolla tube ca. 4.6 cm long, ca. 1.2 mm wide at base, lobes white, glabrous throughout, dorsal lobe ovate-oblong, ca. 1.7 x 0.45 cm, concave, erect, apex acute, lateral lobes ovate, ca. 1.7 x 0.3 cm, clasping the labellum and extending 4 mm beyond, apex rounded; labellum, obovate-elliptic, ca. 1.3 cm x 1 cm curved-backward, with a narrow light red band in the centre lower half, yellow towards apex, glabrous; lateral staminodes white, narrowly obovate, ca. 1.5 x 0.5 cm, glabrous; stamen white throughout, ca. 5.7 cm long, filament ca. 3.5 x 1.2 mm (widest at base), pubescent adaxially and abaxially, anther ca. 0.3 x 0.2 cm, glabrous, anther crest ca. 2 x 3 mm, bilobed, glabrous, thecae oblong, ca. 0.2 x 0.1 cm, glabrous, dehiscing longitudinally for its entire length; ovary ca. 5 x 2 mm, 8.6 cm, stigma cup-shaped, glabrous; epigynous glands two, ca. 0.45 cm long, linear, apex truncate, white. Fruit not seen. Distribution. Endemic in Borneo, Sabah; known only from the type locality, Kg. Sugud. Etymology. The species epithet refers to the location where the type was collected. Ecology. Primary forest in lowlands, hill slope at 50-100 m elevation. Conservation status. Data Deficient (DD). The taxon was assessed using the criteria described in IUCN (2001). The taxon is endemic to Sabah and only found at Kg. Sugud, Penampang, Sabah, Malaysia. One population was observed at the site where specimens were collected.