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55. Glyceria R. Brown, Prodr. 179. 1810.

甜茅属 tian mao shu

Hemibromus Steudel.

Perennial, usually rhizomatous. Culms erect, ascending or prostrate. Leaf sheaths with margins completely or partially fused; leaf blades linear; ligule membranous. Panicle open or contracted, sometimes racemelike when spikelets few. Spikelets with several to many florets, laterally compressed or terete; rachilla smooth or scabrid, disarticulating below each floret; glumes small to almost as long as adjacent lemma, membranous, 1-veined, apex acute or obtuse; floret callus small, glabrous, obtuse; lemmas overlapping, ovate to lanceolate or oblong, thinly herbaceous or thinly leathery, back rounded, smooth, granular or scaberulous, 5–11-veined, veins conspicuous, parallel, apex usually membranous, acute to broadly obtuse or denticulate; palea as long as, longer, or slightly shorter than lemma, keels sometimes narrowly winged. Stamens 2 or 3. x = 10.

About 40 species: temperate regions of the world, in wet habitats; ten species (one endemic) in China.

1 Spikelets linear to narrowly oblong, terete, 1–4.2 cm; palea keels narrowly winged in upper half   (2)
+ Spikelets usually ovate to narrowly oblong, laterally compressed, up to 1(–1.4) cm; palea keels wingless   (4)
2 (1) Spikelets 2.5–4.2 cm; palea distinctly longer than lemma.   1 G. acutiflora subsp. japonica
+ Spikelets 1–2.5 cm; palea as long as or only slightly longer than lemma   (3)
3 (2) Leaf blades 2–3 mm wide; lower panicle branches 2 per node, bearing 1(–3) spikelets.   2 G. chinensis
+ Leaf blades 4–10 mm wide; lower panicle branches 3–5 per node, bearing up to 15 spikelets.   3 G. notata
4 (1) Culms 20–50 cm tall, tufted or with slender rhizomes; leaf blades 1.5–3.5 mm wide   (5)
+ Culms robust, 50–150 cm tall, with thick spreading rhizomes; leaf blades 3–16 mm wide   (6)
5 (4) Plant loosely tufted; lowest panicle branches bearing up to 14 spikelets; spikelets elliptic-oblong, 0.6–0.9 cm.   4 G. tonglensis
+ Plant with filiform rhizomes; lowest panicle branches bearing 1–4 spikelets; spikelets linear, 0.8–1.4 cm.   5 G. leptorhiza
6 (4) Stamens 2, anthers 0.5–0.8 mm; plants mainly of swampy forest   (7)
+ Stamens 3, anthers 1–2 mm; plants usually of wet meadows and other open wet habitats   (8)
7 (6) Culms hard, 5–8 mm in diam.; leaf blades firm; ligule 0.3–1 mm; spikelets pale green maturing yellowish brown.   6 G. leptolepis
+ Culms soft, 3–5 mm in diam.; leaf blades soft, thin; ligule 2–3 mm; spikelets bright green or purple tinged.   7 G. lithuanica
8 (6) Leaf blades 3–5 mm wide; upper glume 3.5–4.5 mm, 3/4 as long as adjoining lemma or more, acuminate.   8 G. spiculosa
+ Leaf blades 5–16 mm wide; upper glume 2–4 mm, 3/4 as long as adjoining lemma or less, obtuse or subacute   (9)
9 (8) Adaxial surface of leaf blades grayish green, minutely papillose; panicle open, branches spreading; upper glume 2–3 mm.   9 G. triflora
+ Adaxial surface of leaf blades green, smooth; panicle somewhat contracted, branches obliquely ascending; upper glume 3–4 mm.   10 G. maxima

Lower Taxa


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