Calamagrostis rupestris

HABIT Perennial. Culms geniculately ascending, or decumbent; 40–80 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2–4 mm long; lacerate. Leaf-blades 8–20 cm long; 3–7 mm wide. Leaf-blade surface scaberulous, or scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic; 10–25 cm long; 3–5 cm wide. Primary panicle branches ascending; bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1 length of fertile spikelet; pubescent.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.8–4.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1 length of lemma.

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 primary vein eciliate, or ciliolate. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 3.8–4.2 mm long; 1.1–1.2 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein eciliate, or ciliolate. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3.4–3.6 mm long; membranous; without keel. Lemma apex erose; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 4.5–8 mm long overall. Rhachilla extension 1.3–1.8 mm long; pilose; hairy above; with 2–2.5 mm long hairs.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION South America: northern South America, western South America, Brazil, and southern South America.

NOTES Aveneae. Tovar 1995.

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