78 
Card. Bull. Singapore 69(1) 2017 
the ground occasionally rooting and forming a new clump. Culm sheaths 15.9-16.9 
x 14.5-15.4 cm, orange in young shoots, covered by white wax on the upper part and 
with dense appressed white to brownish hairs at the base, sheath margin with white 
hairs along the apical part which are gradually replaced by brownish hairs (up to 0.3 
cm long) toward the basal portion, eventually deciduous; auricles rounded, 0.4-0.5 cm 
high, bristles many and long, 2-2.8 cm long; ligules dentate, 0.2-0.4 cm high, bristles 
few, 0.4-0.6 cm long; blade spreading then reflexed, narrowly lanceolate, 10.7-12.4 x 
2-2.7 cm. Leaf 23.2-253 x 2.3-4.5 cm, midrib base orange to yellow, pubescent on 
lower surface; auricles lobe-like, less than 0.5 mm, bristles 0.9-1.7 cm long; ligules 
entire, 1-2 mm high, glabrous. Inflorescences with 1-2 florets in each pseudospikelet, 
without a terminal vestigial flower; empty glumes 2; lemma 6-7 mm high; palea 
keeled at the apex, 8-8.5 mm long; stamens six, up to 4 mm long, anthers yellow with 
free filaments; ovary obovoid with thickened and hairy apex, produced into long hairy 
style 6-7 mm long and ending in a white plumose stigma. 
Distribution. Sumatra, Jambi Province and South Sumatra Province, in the Indonesian 
Ecosystem Restoration area. 
Ecology. This species forms the dominant growth in secondary forest along the road at 
around 60 m asl. Following logging of the forest in this area in 1991, this species has 
become abundant, with a suggestion from the local people that it is being dispersed by 
elephants. 
Notes. The epithet luteus (meaning yellow) refers to the colour of the shoot, culm, base 
of the leaf blade and midrib, and anthers. Table 1 compares D. luteus to its closely 
related species. 
Vernacular names and uses. Unknown. 
Additional specimens examined. INDONESIA: Jambi Province: Batanghari District, 
Bajubang Subdistrict, Hutan Harapan, Jembatan Jengkol, 3 Apr 2013, Wardi et al. BOHK 402 
(BO); Batanghari District, Bajubang Subdistrict, Harapan Rainforest, 500 m before Jembatan 
Jengkol (Jengkol bridge) from office, 02°10'23"S 103°19'54"E, 2 Mar 2016, Damayanto & 
Widjaja 02 (BO), Damayanto & Widjaja 03 (BO), Damayanto & Widjaja 04 (BO); Batanghari 
District, Bajubang Subdistrict, Harapan Rainforest, 1 km after Jembatan Jengkol from office, 
02°1F17.5"S 103°20'22.7"E, 2 Mar 2016, Damayanto & Widjaja 05 (BO). South Sumatra 
Province: Musi Banyuasin District, Batanghari Leko Subdistrict, Hutan Harapan, around 
Bato Nursery, 7 Apr 2013, Wardi et al. BOHK 478 (BO); Musi Banyuasin District, Lubuk 
Bintialo Subdistrict, Harapan Rainforest, Merajang, 02°18'08.1"S 103°17'48.0"E, 3 Mar 
2016, Damayanto & Widjaja 12 (BO), Damayanto & Widjaja 13 (BO), Musi Banyuasin 
District, Lubuk Bintialo Subdistrict, Harapan Rainforest, Near Danau Fokus 3, 02°18'08.1"S 
103°17'48.6"E, 4 Mar 2016, Damayanto & Widjaja 14 (BO). 
