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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.
Calamagrostis teretifolia
HABIT Perennial; caespitose; clumped densely. Butt sheaths persistent and investing base of culm; with compacted dead sheaths. Culms 15–30 cm long; 0.7–1 mm diam. Culm-internodes striate; distally glabrous. Leaves mostly basal. Leaf-sheaths striately veined; glabrous on surface. Ligule an eciliate membrane; 6–10 mm long; acute. Leaf-blades aciculate; involute; 3–5 cm long; 0.5–0.8 mm wide; stiff. Leaf-blade surface glabrous. Leaf-blade apex obtuse.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear; interrupted; 5–6 cm long; 1 cm wide. Primary panicle branches appressed; bearing spikelets almost to the base. Panicle axis with scattered hairs. Panicle branches with scattered hairs.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus 0.5 mm long; pilose; disarticulating obliquely. Floret callus hairs 1–2 mm long.
GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume lanceolate; 1 length of upper glume; membranous; much thinner on margins; purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex erose; acute. Upper glume lanceolate; 6 mm long; 1.7 length of adjacent fertile lemma; membranous; with membranous margins; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex erose; acute.
FLORETS Fertile lemma lanceolate; 3.5 mm long; membranous; shiny; without keel; 3 -veined. Lemma surface smooth; glabrous. Lemma apex erose; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; straight; 4 mm long overall. Palea 2.3 mm long. Rhachilla extension 2 mm long; pilose; with 1–2 mm long hairs.
FLOWER Lodicules 2. Anthers 3; 1.2 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp. Disseminule comprising a floret.
DISTRIBUTION South America: western South America.
NOTES Aveneae. Laegaard 2001.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
