GrassBase - The Online World Grass Flora


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

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

Ichnanthus nemoralis

HABIT Perennial. Culms decumbent, or rambling; 50–130 cm long. Culm-internodes distally glabrous, or pubescent. Leaves cauline. Leaf-sheaths glabrous on surface, or pilose. Ligule a ciliate membrane; 1 mm long. Leaf-blade base with a false petiole; petiole 0.1–0.5 cm long. Leaf-blades lanceolate, or oblong; 6–11 cm long; 10–30 mm wide; coriaceous. Leaf-blade venation with distinct cross veins. Leaf-blade surface pubescent; hairy abaxially, or on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle, or composed of racemes.

Panicle open; linear, or ovate; 12–23 cm long. Primary panicle branches ascending, or spreading; simple, or sparsely divided (at base); 5–12 cm long. Panicle branches bearing congested spikelets.

Racemes borne along a central axis; 5–12 cm long; with branchlets at base of longer racemes. Central inflorescence axis 10–16 cm long. Spikelet packing crowded; irregular.

Spikelets ascending; in pairs. Fertile spikelets sessile and 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; 4.5–6.5 mm long; falling entire; readily shedding fertile florets. Floret callus winged; with apical wings adnate to lemma; these appendages 1–2 mm long.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.5–0.66 length of spikelet; herbaceous; 1-keeled; 3–5 -veined. Lower glume apex acute. Upper glume ovate; 1 length of spikelet; herbaceous; 1-keeled; 5 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; 1-keeled; 5 -veined; acute. Fertile lemma lanceolate; dorsally compressed; 2.5–4.5 mm long; indurate; pallid, or light brown; without keel. Lemma margins involute. Lemma apex acute. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION North America: Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, and Brazil.

NOTES Paniceae. SAR 2003.

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