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 adpressus

HABIT Perennial; caespitose. Culms erect; 20–150 cm long; rooting from lower nodes. Culm-internodes distally glabrous, or pilose. Culm-nodes glabrous, or pubescent. Leaves cauline. Leaf-sheaths pilose; outer margin hairy. Ligule a ciliate membrane; 0.2–2 mm long. Leaf-blade base without a false petiole. Leaf-blades lanceolate, or elliptic, or ovate; 3–16 cm long; 5–29 mm wide. Leaf-blade midrib indistinct; scarcely raised beneath. Leaf-blade venation with distinct cross veins. Leaf-blade surface glabrous, or pubescent; hairy on both sides. Leaf-blade margins scaberulous. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence composed of racemes; embraced at base by subtending leaf.

Racemes numerous; borne along a central axis; appressed; 1.8–10.4 cm long; with branchlets at base of longer racemes. Central inflorescence axis 11–55 cm long. Spikelet packing contiguous; irregular.

Spikelets appressed; in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels 1.8–9.5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or elliptic; dorsally compressed; acute; 4–5.2 mm long; 1–1.5 mm wide; falling entire; readily shedding fertile florets. Rhachilla internodes elongated between glumes. Rhachilla elongation 0.5 mm long. Floret callus winged; with apical wings adnate to lemma; these appendages 1.7–2.2 mm long.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume elliptic; 3.8–5 mm long; 0.9 length of spikelet; herbaceous; much thinner on margins; without keels; 3 -veined. Lower glume apex acute. Upper glume elliptic; 3.5–4.8 mm long; 1 length of spikelet; herbaceous; with hyaline margins; without keels; 5 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret unlike other scales; ovate; 4–5 mm long; 0.5–0.66 length of spikelet; without keels; 5 -veined; acute. Fertile lemma lanceolate, or ovate; 3.8–4.5 mm long; indurate; pallid, or light brown; without keel. Lemma margins involute. Lemma apex acute. Palea involute; indurate.

FLOWER Anthers 3; purple.

FRUIT Caryopsis with adherent pericarp; oblong; 2 mm long; light brown. Hilum punctiform.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Da Silva et al 2014.

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