GrassBase - The Online World Grass Flora


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

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

Catabrosa aquatica

HABIT Perennial. Stolons present. Culms erect, or decumbent; 10–60 cm long; rooting from lower nodes. Leaf-sheaths open for most of their length. Ligule an eciliate membrane; 2–8 mm long. Leaf-blades flat, or conduplicate; 4–14 cm long; 2–10 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong, or ovate; 5–30 cm long; 2.5–10 cm wide. Primary panicle branches whorled at most nodes. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear.

FERTILE SPIKELETS Spikelets comprising 1–3 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; 3–5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume elliptic, or ovate; 1–1.5 mm long; 0.66 length of upper glume; membranous; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex truncate, or obtuse. Upper glume orbicular; 1.2–2.5 mm long; 0.5–0.66 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex truncate, or obtuse.

FLORETS Fertile lemma oblong; 2.5–3.5 mm long; membranous; much thinner above; without keel; 3 -veined. Lemma lateral veins ribbed. Lemma surface glabrous, or puberulous; hairy on veins. Lemma apex truncate. Palea 1 length of lemma; 2 -veined. Palea keels eciliate, or ciliolate.

FLOWER Lodicules 2; obovate; membranous; with a small lateral lobe. Anthers 3; 1.5 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid. Embryo 0.25 length of caryopsis. Hilum elliptic.

DISTRIBUTION Europe: northern, central, southwestern, southeastern, and eastern. Africa: north and Macaronesia. Asia-temperate: Siberia, Soviet Middle Asia, Caucasus, western Asia, China, and Mongolia. Asia-tropical: India. North America: Subarctic, western Canada, eastern Canada, northwest USA, north-central USA, and southwest USA. South America: southern South America.


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