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 jayachandranii

HABIT Perennial. Stolons present. Culms erect, or geniculately ascending; slender; 30–50 cm long. Culm-nodes glabrous. Leaf-sheaths 4–10 cm long; longer than adjacent culm internode; striately veined; glabrous on surface. Ligule an eciliate membrane; 2–4 mm long; acute. Leaf-blades lanceolate; 4–12 cm long; 3–6 mm wide. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2; paired; appressed back to back; 4–8 cm long. Rhachis fragile at the nodes; angular; glabrous on margins. Rhachis internodes columnar; 4–4.5 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 clavate; 1 mm long; glabrous.

STERILE SPIKELETS Companion sterile spikelets well-developed; bisexual; oblong; 5–5.5 mm long; as long as fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; keeled; winged on margins; 11–13 -veined; muticous. Companion sterile spikelet lemmas 2; enclosed by glumes; muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; dorsally compressed; 5.5–6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus glabrous; base truncate; inserted.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; coriaceous; much thinner above; 2-keeled; keeled laterally; 11–13 -veined. Lower glume surface convex; scabrous; rough above; glabrous. Upper glume lanceolate; coriaceous; 1-keeled; winged on keel; winged near apex; 3–5 -veined.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret lanceolate; 5–6 mm long; membranous; 3–5 -veined; acuminate. Palea of lower sterile floret 4.5–5 mm long. Fertile lemma lanceolate; 4.5–5 mm long; membranous; without keel; 5 -veined. Lemma apex entire, or lobed; 2 -fid; muticous, or mucronate.

FLOWER Lodicules 2; 0.75–1 mm long. Anthers 3; 1.5–2 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Fl Kerala 2006.

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