Tricostularia undulata
Content
Description
Forming dense tussocks;
Leaves basal, shorter than to as long as the stems, rigid, strongly ribbed, obtusish, deeply chan- nelled because of the involute margins, scaberulous, 1-3 mm wide.
Panicle much branched, rather diffuse to dense, consisting of 4-5 distant to approximate fascicles of branches.
Distribution
Anambas Is present, Asia-Tropical: Borneo (Sarawak present); Malaya (Peninsular Malaysia present); New Guinea present; Sumatera (Sumatera present); Thailand (Thailand present), Banka present, Billiton present, Ceylon present, G. Padang present, G. Tahan present, Green River present, Karimata Is present, Morehead Patrol Post present, N. Australia present, N. Borneo present, NE. New Guinea present, Padang Kandis present, Pahang present, Palembang present, Papua present, Sepik Distr present, Setul present, Trengganu present, W. & S. Borneo present, Wassi Kussa R present, West. Distr present
From N. Australia to Ceylon, Thailand and Indo-China, in Malesia: Sumatra (Palembang), Banka, Billiton, Malay Peninsula (Trengganu: Padang Kandis, G. Padang; Pahang: G. Tahan; Setul), N. Borneo&Sarawak, W. & S. Borneo, Labuan, Anambas Is., Karimata Is., New Guinea (NE. New Guinea: Sepik Distr., Green River; Papua: Wassi Kussa R.; West. Distr., Morehead Patrol Post).
Notes
As will be evident from the synonymy the systematic place of this species has often been dis- cussed. CLARKE and KUKENTHAL considered it a member of Cladium subg. Baumea (Machaerina in the present treatment), but there cannot lie its true affinity. The leaves are spirally arranged in a basal rosette, flat hypogynous scales are found nowhere in Machaerina, and also the small 3-ribbed fruit with thin marcescent exocarp puts it out of this genus. As a rule the upper flower in Machaerina is reduced; in Tricostularia undulata the spikelets are always 1- flowered, but I never find a small barren glume above the fertile one. BENTHAM (1878) remarked that there might be question of a distinct genus, but in my opinion shape and texture of glumes, nuts, and hypogynous scales unmistakably point to its congenerity with the other Tricostularia species.
Citation
S. T. BLAKE 1948 – In: J. Arn. Arb.: 98
Clarke 1894 – In: Fl. Br. Ind.: 674
CAMUS 1912: p. 152. – In: Fl. Gèn. I.-C.: f. 19, 2-8
Ridl. 1925 – In: Fl. Mal. Pen.: 167
KÜK. 1940 – In: Bull. Jard. Bot. Btzg: 311
THW. 1942 – In: Fedde, Rep. 51: 162
Ridl. 1925 – In: Fl. Mal. Pen.: 167
Clarke 1909: Ill. Cyp.: f. 6-11
UITTIEN 1935 – In: Rec. Trav. Bot. Néerl.: 194
Ridl. 1907 – In: Mat. Fl. Mal. Pen. (Monoc.): 86
Merr. 1921: En. Born.: 62