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.

Ischaemum bolei

HABIT Annual. Culms erect, or geniculately ascending; 60–80 cm long; rooting from lower nodes. Culm-internodes 1.5–13 cm long. Lateral branches ample. Leaf-sheaths 4–6 cm long; glabrous on surface; outer margin hairy. Ligule a ciliolate membrane; 2–4 mm long. Leaf-blade base cordate, or sagittate; with a false petiole; petiole 1–4 cm long. Leaf-blades lanceolate; 3.5–10 cm long; 5–10 mm wide. Leaf-blade surface puberulous; hairy on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2; paired; appressed back to back; 4 cm long. Rhachis fragile at the nodes; angular; glabrous on margins. Rhachis internodes cuneate; 2.5 mm long; 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. Pedicels oblong; 0.5 mm long; 0.15 length of fertile spikelet; glabrous.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; 3.5–4 mm long; as long as fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; keeled; muticous. Companion sterile spikelet lemmas muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 3.5–4 mm long; 1 mm wide; 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 oblong; 1 length of spikelet; coriaceous; 2-keeled; keeled all along; keeled laterally. Lower glume surface convex; muricate; rough on flanks; pilose. Upper glume lanceolate; coriaceous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume margins ciliate. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret lanceolate; 3–3.5 mm long; membranous; ciliate on margins; truncate. Palea of lower sterile floret 1 length of lemma. Fertile lemma oblong; membranous; without keel. Lemma margins ciliate; hairy above. Lemma apex entire; muticous. Palea linear.

FLOWER Anthers 3; 1–2 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Raizada 1994.

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