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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 dasycoleus

HABIT Annual. Culms geniculately ascending, or decumbent; 30–150 cm long; rooting from lower nodes. Lateral branches sparse. Leaves cauline. Leaf-sheaths woolly. Ligule a ciliate membrane; 0.5–1.5 mm long. Leaf-blades lanceolate; 8–13 cm long; 12–20 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface scabrous; rough adaxially; pubescent; hairy abaxially. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 10–20 cm long. Primary panicle branches spreading; whorled at lower nodes; simple; 5–11 cm long. Panicle branches stiff.

Spikelets ascending; 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, or acuminate; 4–4.5 mm long; falling entire; readily shedding fertile florets. Floret callus winged; with apical wings adnate to lemma; these appendages 0.5–1 mm long.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 0.5 length of spikelet; herbaceous; 1-keeled; 3 -veined. Lower glume surface scabrous. Lower glume apex acute, or acuminate. Upper glume lanceolate; 1 length of spikelet; herbaceous; 1-keeled; 5 -veined. Upper glume surface scabrous. Upper glume apex obtuse, or acute.

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

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Mesoamericana, 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.