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FOC | Family List | FOC Vol. 22 | Poaceae

190. Eulalia Kunth, Révis. Gramin. 1: 160. 1829.

黄金茅属 huang jin mao shu

Authors: Shou-liang Chen & Sylvia M. Phillips

Perennial, rarely annual. Culms tufted, usually erect and unbranched. Leaf blades linear to narrowly lanceolate; ligule short, membranous, margin ciliolate. Inflorescence terminal, composed of several to many racemes inserted digitately or along a short axis; racemes elongate with many spikelet pairs, hairy, fragile, sessile and pedicelled spikelets of a pair similar, pedicelled often slightly narrower, both fertile; rachis internodes linear, ciliate along angles; pedicels resembling internodes, usually slightly shorter and more slender. Spikelets lanceolate to narrowly oblong, dorsally compressed; callus short, bearded, hairs usually less than 1/2 spikelet length; glumes cartilaginous to leathery; lower glume flat or slightly concave, hairy, back veinless or inconspicuously veined, flanks rounded in lower half, keeled toward apex, acute to truncate; upper glume boat-shaped, 1-keeled down midline; lower floret reduced to an empty hyaline lemma, rarely absent; upper lemma linear to oblong, occasionally broader, shortly 2-toothed or 2-lobed to middle, awned (E. manipurensis awnless); awn geniculate, sometimes weakly; palea small or absent. Stamens 3. x = 9, 10.

About 30 species: tropical and subtropical regions of the Old World; 14 species (five endemic) in China.

1 Basal leaf sheaths covered in dense woolly hairs   (2)
+ Basal leaf sheaths glabrous, or appressed hairy between veins   (6)
2 (1) Basal leaf sheath hairs creamy or golden brown   (3)
+ Basal leaf sheath hairs dark brown or reddish brown   (4)
3 (2) Sessile spikelets 6–6.5 mm; raceme hairs pinkish.   1 E. siamensis
+ Sessile spikelets 4.6–5.7 mm; raceme hairs yellowish.   2 E. speciosa
4 (2) Culms robust, 2–5 mm in diam.; leaf blades 25–50 cm.   2 E. speciosa
+ Culms slender, 1–1.7 mm in diam.; leaf blades 15–30 cm   (5)
5 (4) Culms 6–9-noded; spikelets 3–3.5 mm; lower glume pilose with whitish brown hairs, apex truncate.   3 E. micranthera
+ Culms 2–3-noded; spikelets 3.5–5 mm; lower glume densely villous with golden brown hairs, apex subacute.   4 E. phaeothrix
6 (1) Sessile spikelet 5–7 mm; lower glume 2-veined between lateral keels, veins connected below apex   (7)
+ Sessile spikelet 3–5 mm; lower glume usually not or only obscurely veined between lateral keels   (8)
7 (6) Leaf blades 8–16 mm wide, apex acute.   1 E. siamensis
+ Leaf blades 4–6(–8) mm wide, apex acuminate-filiform.   5 E. quadrinervis
8 (6) Spikelets awnless.   6 E. manipurensis
+ Spikelets awned   (9)
9 (8) Plant with slender spreading stolons; raceme hairs brown; lower lemma absent.   7 E. leschenaultiana
+ Plant tufted or rhizomatous; raceme hairs white or purplish (spikelets often brown); lower lemma present   (10)
10 (9) Leaf blades conspicuously pruinose on abaxial surface, lanceolate or linear-lanceolate, 5–10 mm wide   (11)
+ Leaf blades green or reddish, linear, 2–6 mm wide   (12)
11 (10) Leaf blades 3–8 cm, glabrous; upper lemma 2-lobed to middle.   8 E. brevifolia
+ Leaf blades 10–20 cm, tomentose; upper lemma very shortly 2-toothed.   9 E. pruinosa
12 (10) Racemes with long silky hairs concealing the spikelets; plant with slender spreading rhizomes.   10 E. mollis
+ Racemes with shorter hairs, spikelets obvious; plant without long rhizomes   (13)
13 (12) Leaf blades inrolled, tough; upper glume with 2–2.5 mm awn.   11 E. pallens
+ Leaf blades flat, herbaceous; upper glume not awned   (14)
14 (13) Inflorescence with ca. 5 cm axis; upper lemma very shortly 2-toothed.   12 E. splendens
+ Inflorescence digitate or axis less than 5 cm; upper lemma deeply 2-toothed   (15)
15 (14) Culm glabrous below inflorescence; raceme hairs silvery white; upper lemma 2-toothed to middle.   13 E. trispicata
+ Culm densely pilose below inflorescence; raceme hairs faintly mauve tinged; upper lemma 2-toothed in upper 1/4.   14 E. yunnanensis

  • List of lower taxa


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