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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 leptophyllus

HABIT Perennial. Rhizomes elongated. Culms erect; 50–120 cm long. Leaves cauline. Leaf-sheaths glabrous on surface. Ligule a ciliolate membrane; 0.5 mm long. Leaf-blade base amplexicaul. Leaf-blades lanceolate, or oblong; 10–30 cm long; 20–40 mm wide; membranous. Leaf-blade venation with distinct cross veins. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic; 15–23 cm long. Primary panicle branches whorled at most nodes; 10–15 cm long. Panicle axis scabrous. Panicle branches capillary; flexuous; bearing approximate spikelets.

Spikelets ascending; in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels filiform; angular; 4 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; acuminate; 4 mm long; falling entire; readily shedding fertile florets. Floret callus winged; with apical wings adnate to lemma; these appendages 1.5 mm long.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate; 2.5–3 mm long; 0.6–0.75 length of spikelet; herbaceous; 1-keeled; 1–3 -veined. Lower glume lateral veins absent, or distinct. Lower glume apex cuspidate. Upper glume linear, or oblong; 1 length of spikelet; herbaceous; 1-keeled; 5 -veined. Upper glume surface smooth, or asperulous. Upper glume apex cuspidate.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; lanceolate, or oblong; 1 length of spikelet; 1-keeled; 5 -veined; smooth, or scaberulous; cuspidate. Fertile lemma elliptic; dorsally compressed; 3–3.5 mm long; indurate; without keel. Lemma margins involute. Lemma apex acute. Palea involute; indurate.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Stieber.

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