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.

Cortaderia bifida

HABIT Perennial; caespitose. Culms 100–300 cm long; 2–3 mm diam. Culm-nodes glabrous, or pubescent. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule a fringe of hairs; 1–1.5 mm long. Leaf-blades 20–100 cm long; 5–10 mm wide. Leaf-blade margins scabrous.

INFLORESCENCE Gynodioecious ("male", in this context, indicating the bisexual state). Inflorescence a panicle; embraced at base by subtending leaf.

Panicle open; lanceolate; 30–40 cm long; 8–10 cm wide. Primary panicle branches 10–20 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1.5–4 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 3 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 7–8.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 1 mm long; pilose. Floret callus hairs 1.5–2 mm long.

GLUMES Glumes similar; reaching apex of florets; similar to fertile lemma in texture; gaping. Lower glume lanceolate; 7–8 mm long; 1 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume margins ciliolate. Lower glume apex entire, or dentate; 2 -fid; acute. Upper glume lanceolate; 8–14 mm long; 1.2 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume margins ciliolate. Upper glume apex entire, or dentate; 2 -fid; acute.

FLORETS Fertile florets female. Fertile lemma lanceolate; 6–7 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous; plumose; hairy below. Lemma margins ciliate. Lemma hairs 4–6 mm long. Lemma apex lobed; 2 -fid; with filiform lobes; with lobes 1.5–2 mm long; acuminate; awned; 1 -awned. Principal lemma awn 6.5–7.8 mm long overall. Palea lanceolate; 4.5–5 mm long; 0.66 length of lemma; 2 -veined. Palea keels ciliolate. Palea surface pilose; hairy on flanks. Palea apex emarginate, or truncate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3.

FRUIT Caryopsis with adherent pericarp.

MALE Male inflorescence bisexual similar to female; a panicle. Male spikelets resembling female.

DISTRIBUTION South America: Mesoamericana, northern South America, and western South America.

NOTES Arundineae. Conert 1993.

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