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Jansenella griffithiana (Mull.Hal.) Bor in Kew Bull. (10): 98, fig. on page 97. 1955; Conert in Bot. Jahrb. Syst. 77: 236. 1957; Bor in Grass Burma, Ceylon, India & Pakistan: 426, fig. 45. 1960; Gould in Dassanayake, Rev. Handb. Fl. Ceylon 8: 294. 1994.— Danthonia grif ithiana Mull. Hal. in Bot. Zeit. 14: 347. 1856.— Arundinella griffithiana (Mull. Hal.) Bor in Ind. For. Rec. (Bot.) 1, 3: 73. 1938.— Danthoniopsis grif ithiana (Mull. Hal.) Bor in Fl.Assam 5: 187. 1940.— Type: India, Khasia Hills (“Khasiya”), Gri ith 36 in Herb.Karl Muller Hal.(lectotype B [Digital image B-10-0240400!], designated by Conert (1957)).[Aira sp. Griff., Not. Pl.Asiat. 3: 55. 1851; Ic. Pl. Asiat. 3: t. 146, fig. 3. 1851. (“Airoideum”), nom. nud.]. — Arundinella avenacea Munro ex Thwaites in Enum. Pl. Zeyl.: 362. 1864; Hook.f. in Trimen, Handb. Fl. Ceylon 5: 176. 1900; Keng in Nat. Centr. Univ. Sci. Rep., Nanking, Ser. B, 2(3): 62, fig. 32. 1936.— Type: Sri Lanka, Saffragam Distr., Thwaites CP 3471 (lectotype K!, designated here; isolectotypes BM!, E!, K!, PDA).— Arundinella campbelliana Lisboa in J. Bomb. Nat. Hist. Soc. 5: 346. 1891.— Type: India, Mahableshwar, com. Lisboa (holotype BLAT; isotype K!).— Arundinella avenacea Thwaites var. robusta Hook.f. in Trimen, Handb. Fl. Ceylon 5: 177. 1900.— Type: Sri Lanka, Herb. Peraden.(holotype PDA, not seen).

Annual, mat-forming. Culms 10–30 cm tall, rooting from the lower nodes. Sheaths

    • 0.8

      –3 cm long, margins hairy. Leaf-blades lanceolate to ovate-oblong, 1–4(–6) cm by 2–8(–

  • 14)

    mm, veins prominent on upper surface and scabrous, with a few scattered hairs on both

sides, base amplexicaul, margins thick and scabrid. Ligule a short membrane, ca 0.2 mm long. Panicles compact, 1–4 cm long, branches and branchlets hirsute. Spikelets 6–7(–9) mm long, pedicels 0.5–2 mm long, scabrous. Glumes membranous, aristate to shortly awned; lower glumes lanceolate, 3.5–4 mm long, excluding awns, 3-nerved, dorsally with or without a few tubercle-based hairs on or sometimes between the nerves, awns ca 1 mm long, scabrid; upper glumes elliptic-oblong, 5–6 mm long, dorsally with or without sparse tubercle- based hairs, awns up to 2 mm long, scabrid. Lower florets barren, male, female, or bisexual; lemmas membranous, oblong-ovate, 5–6 mm long, 3-nerved, awns ca 1 mm long, scabrous; paleas membranous, elliptic-oblong, ca 3 mm long, 2-keeled, very narrowly winged on the keels. Upper florets callus hairy, hairs 0.5–1 mm long; lemmas coriaceous or sub- cartilaginous, elliptic-oblong, 2.5–3 mm long, pilose on the dorsal surface with a dense tuft of hair on each side, lateral tufts of hairs 0.5–1.3 mm long, deeply bifid, lateral lobe 1.5–2 mm long, awned from between the sinus, up to 15 mm long; paleas coriaceous, oblanceolate, 2–2.5 mm long, narrowly winged on keels, covered on the adaxial surface with 1-celled hairs which are slender below and become thicker towards the apex; stamens 3, anthers 0.5–1.75 mm long; stigma ca 0.5 mm long; caryopsis oblong-obovate, 1–1.5 by 0.5–0.75 mm, hilum


Thailand.— PENINSULAR: Ranong [Khlong Nakha Wildlife Sanctuary, Khao Pauta Luang Kaeo, alt. ca 1300 m, 1 Feb. 1929, Kerr 16947 (BK, BM, K)]; [l.c., 1 Jan. 2001, A. Teerawatananon & S. Sungkaew 2001–1 (BKF, THNHM)].

Distribution.— India (Chhattisgarh, Karnataka, Kerala, Maharashtra, Meghalaya, Orissa), Sri Lanka, Myanmar, Thailand (Ranong: Khao Pauta Luang Kaew, 30° 20’ N, 98° 30’ E).

Ecology.— Open areas on mountain ridges in montane forest, ca 1300 m.

Notes.— Arundinella avenacea var. robusta Hook. f. was not accounted for by Bor (1955, 1960) and Gould (1994). It is probably just a larger plant (Veldkamp, personal communication).

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