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 nemorosus

HABIT Annual. Culms prostrate; 30–40 cm long; rooting from lower nodes. Culm-nodes pubescent. Lateral branches sparse. Leaf-sheaths pilose. Ligule a ciliate membrane; 0.5–1 mm long. Leaf-blade base cordate; asymmetrical. Leaf-blades lanceolate; 2–8.5 cm long; 5–30 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface glabrous, or pilose; hairy on both sides; with simple hairs, or tubercle-based hairs. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; terminal and axillary.

Panicle open; linear, or lanceolate; 3–10 cm long; 0.2–3 cm wide. Primary panicle branches appressed, or ascending; simple; 1–5 cm long; bearing 6–8 fertile spikelets on each lower branch.

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 elliptic; laterally compressed; acute, or acuminate; 2–3.5 mm long; falling entire; readily shedding fertile florets. Floret callus winged; with apical wings shrivelled to concave scars; these appendages 0.5 mm long.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate, or ovate; 0.5–1 length of spikelet; herbaceous; much thinner on margins; 1-keeled; 3–5 -veined. Lower glume lateral veins ribbed. Lower glume surface glabrous, or pilose. Lower glume apex cuspidate. Upper glume elliptic, or oblong; 1 length of spikelet; herbaceous; with hyaline margins; 1-keeled; 5–7 -veined. Upper glume lateral veins ribbed. Upper glume surface glabrous, or pilose. Upper glume apex acute, or acuminate.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic, or oblong; 1 length of spikelet; 1-keeled; 5 -veined; ribbed; glabrous, or pilose; acute, or acuminate. Fertile lemma elliptic, or ovate; dorsally compressed; 2–2.5 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 North America: Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, Brazil, and southern South America.

NOTES Paniceae. Stieber.

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