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Descriptions

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

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

Ichnanthus lancifolius

HABIT Perennial; culms solitary. Rhizomes elongated. Basal innovations flabellate. Culms erect; 50–54 cm long. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule a ciliolate membrane; 0.1–1 mm long. Leaf-blade base without a false petiole, or with a brief petiole-like connection to sheath. Leaf-blades linear, or lanceolate; 15–45 cm long; 10–15 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; effuse; 15–30 cm long. Panicle branches capillary.

Spikelets appressed; in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels filiform; angular.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; acute; 4–7 mm long; falling entire; readily shedding fertile florets. Floret callus winged; with apical wings adnate to lemma; these appendages 2–3 mm long.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate, or ovate; 3–4 mm long; 0.5–0.75 length of spikelet; herbaceous; 1-keeled; 3 -veined. Lower glume surface smooth, or asperulous. Lower glume apex acute. Upper glume lanceolate, or ovate; 1 length of spikelet; herbaceous; 1-keeled; 5–7 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; lanceolate, or ovate; 1 length of spikelet; 1-keeled; 5–7 -veined; acute. Fertile lemma lanceolate, or oblong; dorsally compressed; 3–4 mm long; indurate; without keel. Lemma margins involute; eciliate, or ciliolate. Lemma apex acute. Palea involute; indurate.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3.

FRUIT Caryopsis with adherent pericarp.

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

NOTES Paniceae. Stieber.

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