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Descriptions

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

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

Eustachys uliginosa

HABIT Perennial; caespitose. Butt sheaths green, or purple. Basal innovations flabellate. Culms erect; 30–100 cm long; 2–3 mm diam.; 3–4 -noded. Culm-nodes glabrous. Leaf-sheaths keeled; glabrous on surface. Ligule a ciliate membrane; 0.1–0.2 mm long. Leaf-blades flat, or conduplicate; 6–15 cm long; 4–8 mm wide. Leaf-blade midrib keeled beneath. Leaf-blade surface glabrous. Leaf-blade margins smooth, or scabrous. Leaf-blade apex obtuse; apiculate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 3–12; digitate; unilateral; 4–16 cm long; 2–2.5 mm wide. Rhachis angular. Spikelet packing broadside to rhachis; crowded; regular; 1 -rowed.

Spikelets pectinate; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets obovate; laterally compressed; 1.6–2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; dissimilar; shorter than spikelet; thinner than fertile lemma; gaping. Lower glume lanceolate; 0.9–1.3 mm long; 0.5–0.7 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume surface puberulous. Lower glume apex acute. Upper glume oblong; 1.1–1.5 mm long; 0.7–0.8 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume surface puberulous. Upper glume apex lobed; 2 -fid; obtuse; awned; 1 -awned. Upper glume awn 0.5–1 mm long.

FLORETS Fertile lemma oblate; laterally compressed; gibbous; 1.6–2 mm long; coriaceous; dark brown; shiny; keeled; 3 -veined. Lemma midvein pubescent. Lemma surface glabrous. Lemma margins pubescent. Lemma apex acute; muticous, or mucronate. Palea 2 -veined. Apical sterile florets 1 in number; barren; cuneate; 1 mm long. Apical sterile lemmas scabrous; truncate.

FLOWER Anthers 3; 0.6 mm long.

DISTRIBUTION South America: western South America, Brazil, and southern South America.

NOTES Cynodonteae. SAR 2004.

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