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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Eustachys brevipila
HABIT Perennial; caespitose. Basal innovations intravaginal; flabellate. Culms erect; 10–45 cm long; 1–2 -noded. Culm-internodes elliptical in section; distally glabrous. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths with winged keel. Ligule a ciliate membrane; 0.4–0.7 mm long. Leaf-blades conduplicate; 2–11 cm long; 2–4 mm wide. Leaf-blade surface glabrous. Leaf-blade apex abruptly acute.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 3–5; digitate; unilateral; 1–5 cm long. Rhachis angular; 3 mm wide; glabrous on surface; scaberulous on margins. 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; 1.8–2.4 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; 1–1.5 mm long; 0.66–0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex emarginate, or acute; muticous, or mucronate. Upper glume oblong; 1.5–2 mm long; 0.75–0.85 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume surface asperulous; rough above. Upper glume apex lobed; 2 -fid; obtuse; awned; 1 -awned. Upper glume awn 0.5–0.9 mm long.
FLORETS Fertile lemma oblate; laterally compressed; 1.8–2.4 mm long; chartaceous; dark brown; keeled; 3 -veined. Lemma midvein ciliate; hairy in the middle. Lemma surface asperulous; rough above. Lemma margins ciliate; hairy above. Lemma hairs 0.5 mm long. Lemma apex acute; muticous, or mucronate. Palea 1 length of lemma; 2 -veined. Palea keels eciliate, or ciliolate. Rhachilla extension 0.3–0.4 mm long. Apical sterile florets 1 in number; barren; cuneate; 0.5 mm long. Apical sterile lemmas truncate.
FLOWER Anthers 3; 0.5 mm long.
FRUIT Caryopsis with adherent pericarp; trigonous; 1.1–1.2 mm long; dark brown. Embryo 0.5 length of caryopsis. Hilum punctiform.
DISTRIBUTION South America: Brazil and southern South America.
NOTES Cynodonteae. Ros & Iz 1997.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
