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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Eriochloa stevensii

HABIT Annual. Culms erect; 50–100 cm long. Culm-internodes distally pubescent. Leaves cauline. Leaf-sheaths pubescent. Ligule a fringe of hairs; 0.5–1 mm long. Leaf-blades 10–21 cm long; 4–14 mm wide. Leaf-blade surface pubescent; densely hairy.

INFLORESCENCE Inflorescence composed of racemes.

Racemes numerous; 17–57; borne along a central axis; ascending; unilateral; 3.4–5.5 cm long; 4–5 mm wide. Central inflorescence axis 13–21 cm long; pubescent. Rhachis angular; pubescent on surface.

Spikelets in pairs. Fertile spikelets pedicelled. Pedicels oblong; 0.3–0.7 mm long; pubescent; tip discoid.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 3.4–5.5 mm long; 1.2 mm wide; falling entire. Spikelet callus globular; incorporating lowest rhachilla internode with adnate lower glume; 0.2–0.3 mm long; glabrous.

GLUMES Glumes one the lower absent or obscure; reaching apex of florets, or exceeding apex of florets; thinner than fertile lemma. Upper glume lanceolate; 3.4–5.5 mm long; 1 length of spikelet; membranous; without keels; 3 -veined. Upper glume surface pubescent; hairy below. Upper glume apex acuminate; muticous, or mucronate, or awned; 1 -awned. Upper glume awn 0–1 mm long.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; lanceolate; 0.8–1 length of spikelet; membranous; 3 -veined; pubescent; hairy below; acuminate. Fertile lemma elliptic; 1.9–2.3 mm long; 0.8–1 mm wide; indurate; without keel. Lemma surface papillose. Lemma margins involute. Lemma apex obtuse; pubescent; mucronate, or awned; 1 -awned. Principal lemma awn 0.1–0.4 mm long overall. Palea involute; indurate.

FLOWER Anthers 3; 1.1–1.3 mm long; yellow.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.1–1.2 mm long. Embryo 0.33 length of caryopsis. Hilum linear; 0.33 length of caryopsis.

DISTRIBUTION South America: Mesoamericana and western South America.

NOTES Paniceae. Davidse 1994.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.