Drepanostachyum Keng f.

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Morphology General Habit

Perennial. Rhizomes short (10), or elongated (1); leptomorph (1), or pachymorph (10). Culms erect (7/7); 140-315-540 cm long; woody; without nodal roots (1/1). Culm-internodes terete (8/8). Culm-nodes swollen (5/5). Lateral branches dendroid. Branch complement three (1/10), or several (3/10), or many (8/10); in a horizontal line (1/5), or in an irregular line (2/5), or in a clump (2/5); with subequal branches (6/6); thinner than stem (2/2). Culm-sheaths persistent (1/3), or tardily deciduous (1/3), or deciduous (1/3); without auricles (6/6). Culm-sheath blade linear (8/9), or lanceolate (2/9); narrower than sheath (1/1). Leaf-sheath auricles absent (9), or falcate (2). Ligule an eciliate membrane (7), or a ciliolate membrane (3), or a ciliate membrane (1). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades persistent (7), or deciduous at the ligule (4); linear (4), or lanceolate, or oblong (1); herbaceous (5), or chartaceous (6). Leaf-blade midrib conspicuous (3/3). Leaf-blade venation without cross veins (5), or with obscure cross veins (5), or with distinct cross veins (1).

Morphology Reproductive morphology Inflorescences

Synflorescence on the same culm as leaves (4/6), or on a separate leafless culm (2/6). Inflorescence a panicle (5/6), or composed of racemes (2/6); terminal (2/6), or terminal and axillary (4/6); subtended by an unspecialized leaf-sheath (3/6), or bracts (3/6). Panicle open (4/5), or contracted (1/5). Racemes single (1/2), or paired (1/2). Spikelets solitary (5/5). Fertile spikelets pedicelled (6/6).

Morphology Reproductive morphology Inflorescences Spikelets

Spikelets comprising 1 fertile florets (1/6), or 2 fertile florets (2/6), or 3-4 fertile florets (3/6), or 5 fertile florets (2/6), or 6 fertile florets (1/6), or 10-12 fertile florets (1/6); with a barren rhachilla extension (2/6), or with diminished florets at the apex (6/6). Spikelets linear (1/6), or lanceolate (2/6), or oblong (2/6), or ovate (1/6); laterally compressed (6/6); 8-13.75-25 mm long; breaking up at maturity (6/6); disarticulating below each fertile floret (6/6). Rhachilla internodes glabrous (2/6), or pubescent (1/6), or pilose (3/6).

Fertile

Spikelets comprising 1 fertile florets (1/6), or 2 fertile florets (2/6), or 3-4 fertile florets (3/6), or 5 fertile florets (2/6), or 6 fertile florets (1/6), or 10-12 fertile florets (1/6); with a barren rhachilla extension (2/6), or with diminished florets at the apex (6/6). Spikelets linear (1/6), or lanceolate (2/6), or oblong (2/6), or ovate (1/6); laterally compressed (6/6); 8-13.75-25 mm long; breaking up at maturity (6/6); disarticulating below each fertile floret (6/6). Rhachilla internodes glabrous (2/6), or pubescent (1/6), or pilose (3/6).

Morphology Reproductive morphology Inflorescences Bracts Glume

Glumes persistent (6/6); shorter than spikelet (6/6). Lower glume lanceolate (2/6), or ovate (4/6); 0.8-0.9-1 length of upper glume; chartaceous (1/2), or herbaceous (1/2); without keels (5/6), or 1-keeled (1/6); 3 -veined (4/5), or 4 -veined (3/5), or 5 -veined (4/5), or 6-7 -veined (1/5). Lower glume surface smooth (5/6), or asperulous (1/6); glabrous (4/6), or pilose (2/6). Lower glume apex obtuse (1/5), or acute (2/5), or acuminate (3/5); muticous (5/6), or mucronate (1/6). Upper glume lanceolate (1/6), or elliptic (5/6); 0.5-0.65-0.75 length of adjacent fertile lemma; chartaceous (1/2), or herbaceous (1/2); without keels (5/6), or 1-keeled (1/6); 4 -veined (1/5), or 5 -veined (3/5), or 6 -veined (2/5), or 7 -veined (4/5), or 8-9 -veined (2/5). Upper glume surface smooth (5/6), or scabrous (1/6); glabrous (3/6), or pilose (3/6). Upper glume apex obtuse (1/5), or acute (2/5), or acuminate (3/5); muticous (5/6), or mucronate (1/6).

Morphology Reproductive morphology Flowers Florets

Fertile lemma lanceolate (1/5), or ovate (4/5); chartaceous (4/5), or herbaceous (1/5); without keel (6/6); 7-9 -veined (5/5). Lemma lateral veins prominent (1/1). Lemma surface smooth (4/6), or scaberulous (1/6), or scabrous (3/6); glabrous (5/6), or pubescent (1/6). Lemma margins eciliate (4/6), or ciliolate (1/6), or ciliate (1/6). Lemma apex acute (3/5), or acuminate (2/5); muticous (2/6), or mucronate (4/6). Palea 1-1.1-1.3 length of lemma; 2 -veined (2/5), or 4-6 -veined (1/5). Palea keels smooth (5/6), or scabrous (1/6); eciliate (5/6), or ciliolate (1/6). Palea apex entire (1/2), or dentate (2/2); muticous (5/6), or with excurrent keel veins (1/6). Apical sterile florets resembling fertile though underdeveloped (5/6), or distinct from fertile (1/6); 1 in number (1/1); rudimentary (1/1).

Morphology Reproductive morphology Flowers

Lodicules 3 (6/6); membranous (1/1); glabrous (1/6), or ciliate (5/6). Anthers 3 (6/6). Stigmas 2 (4/5), or 3 (1/5). Ovary glabrous (4/4).

Morphology Reproductive morphology Fruits

Caryopsis with adherent pericarp (5/5); fusiform (4/5), or oblong (1/5); apex unappendaged (5/5). Hilum linear (4/4).

Distribution

Temperate Asia (5), or Tropical Asia (6).