Calamagrostis hackelii

HABIT Perennial; caespitose; clumped densely. Culms 5–18 cm long; 1 -noded. Ligule an eciliate membrane; 4–7 mm long; acute. Leaf-blades filiform; convolute; 1–3 cm long; 0.2–0.3 mm wide; stiff. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle capitate; ovate; 1.5–2 cm long; 1–1.5 cm wide.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.3–0.4 mm long. Floret callus glabrous.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4.5 mm long; 1.5 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3 mm long; membranous; without keel; 5 -veined. Lemma apex erose; truncate; muticous. Rhachilla extension 0.8 mm long; glabrous.

FLOWER Lodicules 2. Anthers 3; 1.8 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Turpe 1995.

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