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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 grandifolius

HABIT Perennial. Rhizomes elongated. Butt sheaths pubescent. Culms geniculately ascending; 60–200 cm long. Leaf-sheaths pilose. Ligule a ciliate membrane; 1 mm long. Collar dark. Leaf-blade base with a brief petiole-like connection to sheath, or with a false petiole; petiole 0.3–2 cm long. Leaf-blades lanceolate, or ovate; 22–32 cm long; 35–60 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface glabrous. Leaf-blade margins glabrous, or ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 20–30; borne along a central axis; 3–15 cm long. Central inflorescence axis 15–45 cm long. Spikelet packing distant; irregular.

Spikelets appressed; in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster. Pedicels filiform; angular; 2–3 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 3.5–4.5 mm long; falling entire; readily shedding fertile florets. Floret callus winged; with apical wings shrivelled to concave scars.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 0.5–0.66 length of spikelet; herbaceous; 1-keeled; 3 -veined. Lower glume lateral veins ribbed. Lower glume surface pilose; hairy at apex. Lower glume apex acute. Upper glume ovate; 1 length of spikelet; herbaceous; 1-keeled; 5 -veined. Upper glume lateral veins ribbed. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; oblong; 0.5–0.66 length of spikelet; 1-keeled; 5 -veined; ribbed; acute. Fertile lemma oblong; dorsally compressed; 3.3–3.7 mm long; indurate; shiny; 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: Brazil.

NOTES Paniceae. Stieber.

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