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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 longhi-wagnerae

HABIT Perennial. Rhizomes short. Culms erect; 113–138 cm long; 5–8 mm diam.; without nodal roots. Leaf-sheaths glabrous on surface, or pilose. Leaf-sheath auricles erect. Ligule a ciliolate membrane; 1 mm long. Collar pilose. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.5 cm long. Leaf-blades lanceolate; 33–41 cm long; 28–34 mm wide. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes borne along a central axis; distant; 70–77 cm long. Central inflorescence axis 30–36 cm long. Spikelet packing distant; irregular.

Spikelets appressed; in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels filiform; unequal; 2 mm long, or 7–13 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 6 mm long; falling entire; readily shedding fertile florets. Floret callus winged; with apical wings adnate to lemma; these appendages 1.8 mm long.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 5 mm long; 0.8 length of spikelet; herbaceous; 1-keeled; 5–7 -veined. Lower glume surface scabrous. Lower glume margins ciliolate. Lower glume apex acuminate. Upper glume ovate; 6 mm long; 1 length of spikelet; herbaceous; 1-keeled; 9–11 -veined. Upper glume surface scabrous. Upper glume apex acuminate.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; elliptic; 6 mm long; 1 length of spikelet; 1-keeled; 9–11 -veined; scabrous; acuminate. Fertile lemma lanceolate, or ovate; dorsally compressed; 5 mm long; indurate; pallid, or light brown; without keel. Lemma margins involute. Palea involute; indurate.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Moto & Oliveira 2012.

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