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Descriptions

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

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

Agrostis curtisii

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 10–60 cm long; 2–3 -noded. Culm-internodes scaberulous. Leaf-sheaths without keel; scaberulous. Ligule an eciliate membrane; 2–4 mm long; acute. Leaf-blades filiform; conduplicate; 5–20 cm long; 0.2–0.3 mm wide. Leaf-blade surface scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.

Panicle contracted; lanceolate; 3–10 cm long; 0.5–1.5 cm wide. Panicle branches terete; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; terete; 1–4 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or oblong; laterally compressed; 3–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume lanceolate; 1–1.3 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.4–1.5 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong, or ovate; 2–2.7 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma apex truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 4–5 mm long overall; with twisted column. Palea oblong; 0.1–0.25 length of lemma; hyaline; 2 -veined. Palea apex obtuse.

FLOWER Lodicules 2; lanceolate; membranous. Anthers 3; 1.5–2 mm long. Stigmas 2; laterally exserted.

FRUIT Caryopsis with adherent pericarp; ellipsoid; isodiametric; biconvex; estipitate; without sulcus; 1.5 mm long; smooth; apex unappendaged. Embryo 0.2 length of caryopsis. Hilum linear; 0.9 length of caryopsis. Endosperm farinose.

DISTRIBUTION Europe: northern and southwestern. Africa: north.

NOTES Aveneae. =Agrostis setacea. CEH.

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