THAI FOREST BULLETIN (BOTANY) 36
2. Centotheca longilamina Ohwi, Bull. Tokyo Sci. Mus. 18.(10). 1947. Type: Indonesia, Java, Batavia, Pasir-Kiara Djingkang, 8 June 1924, Bakhuizen van der Brink 3312 (isotype K!).— Centotheca lappacea (L.) Desv. var. longilamina (Ohwi) Bor, Grass Burm. Ceyl. Ind. & Pak. 459. 1960. Fig 2.
Perennial, tufted. Culms solid, terete, erect, up to 1.5 m tall, glabrous. Leaf-sheaths 5–10 cm long, chartaceous, glabrous except tomentose along margins. Ligules 1.8–2.2 mm long, membranous, glabrous, rounded at apex. Leaf-blade linear, 25–35 by 2–3.5 cm, pale green above, nerve obscure above, mid-nerve thick, cross-nerves distinct below; collar dark purplish, tomentose, base narrow, symmetric, with bulbous-based hairs along lower margins, apex acuminate. Inflorescence an open panicle; elliptic in outline, 20–30 by 15–25 cm; peduncles glabrous, terete; main axis glabrous, 20–30 cm long, glabrous; branchlets alternate, hirsute at base; capillaries and pedicels hispidulous. Spikelets solitary, slightly terete, ovate-oblong, 3.5–6 mm long, greenish but turning to dark brown during maturation. Lower glume 2–2.5 mm long, boat-shaped or elliptic, 3-nerved, membranous-chartaceous, hispidulous especially on the mid-nerve, apex acute. Upper glume 2.5–2.6 mm long, lanceolate, 5-nerved, membranous-chartaceous, dark green, apex acute. Lower floret with lemma 2.2–4.5 mm long, oblong, 5–7-nerved, chartaceous, bulbose-based bristles along upper margins, apex emucronate. Palea 2–2.3 mm long, oblanceolate, hyaline, 2-nerved, apex acute. Lodicules 2, cuneate. Stamens 2, yellow, ca 1 mm long. Caryopsis dark grey,
Thailand.— EASTERN: Nakhon Ratchasima [Khao Saming, 27 Jan. 1927, Put 569 (K)]; PENINSULAR: Ranong [Klong Nakha, Geesink 7581 (K); Khao Pawta Chang Dang, 21 Jan. 1929, Kerr 16789 (K)]; Phangnga [Khao Phota Luang Kaeo, 29 Nov. 1974, Geesink 7720 (K)]; Trang [Klong Non Si, Khao Chang, 26 Sept. 1924, Kerr 9314 (K)].
Distribution.— India, Myanmar, Indo-China, Malay Peninsula and Indonesia. Ecology.— Along trails in the deep shade of evergreen forest, alt. 0–800 m.
Note.— C. longilamina is recognized by its thickly chartaceous and lanceolate leaf-blade. The lower lemma has sparse bulbose-base bristles and an emucronate apex.
Brongn. in Duperr., Voy. Coq. Bot. Phan. 49. 1831.
Perennial, caepitose grasses. Leaf-blades broadly linear to lanceolate with a pseudopetiole. Ligules membranous or ciliolate. Inflorescence a panicle of a few racemose branches. Spikelets comprising several florets, the lowest bisexual, the following empty and sterile. Glumes unequal, chartaceous. Lemmas few to many with prominent, retrorsely scabrid awns an apical tuft. Palea 2-keeled, boat-shaped, hyaline.
Two species, distributed from tropical and subtropical Asia to Australia and Madagascar. One species in Thailand.
Lophatherum gracile Brongn. in Duperr.,Voy. Coq. Bot. Phan. 50, t.8. 1831. Type: Indonesia, Ambon, Dumont d’Urville s.n. (holotype P, not seen). Fig. 3.