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Descriptions

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

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

Ischaemum borii

HABIT Annual. Culms erect; 15 cm long. Culm-internodes 4 cm long. Culm-nodes bearded. Lateral branches sparse. Leaf-sheaths 1–3 cm long; glabrous on surface. Leaf-sheath auricles erect. Ligule an eciliate membrane. Leaf-blade base with a false petiole; petiole 0.3–0.4 cm long. Leaf-blades linear, or lanceolate; 2–3.5 cm long; 4–7.5 mm wide. Leaf-blade venation prominent. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence composed of racemes; subtended by a spatheole; enclosed. Spatheole lanceolate.

Racemes 2; paired. Rhachis fragile at the nodes; angular. Rhachis internodes clavate; flat and forming a U or V shape with the pedicel in rear view. Rhachis internode tip transverse; cupuliform.

Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas, or male; elliptic; laterally compressed; 3 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; keeled; dentate; 2 -fid; awned; one glume awned.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 4–5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus oblong; base truncate; inserted.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume elliptic; 1 length of spikelet; coriaceous; 2-keeled; keeled all along; keeled laterally. Lower glume surface convex; with transverse tufts of hair (2 tufts). Lower glume apex dentate; 2 -fid; awned; 1 -awned. Lower glume awn 9 mm long. Upper glume elliptic; coriaceous; 1-keeled. Upper glume surface with marginal tufts of hair (2 tufts). Upper glume apex lobed; 2 -fid; awned; 2 -awned (on lobes). Upper glume awn 5–8 mm long.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret oblong; 3–3.5 mm long; membranous. Fertile lemma oblong; 3 mm long; hyaline; without keel. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 60 mm long overall; with twisted column. Column of lemma awn glabrous. Palea 2.5–3 mm long.

FLOWER Anthers 3; 1.5 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Almeida 2006.

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