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.

Rottboellia goalparensis

HABIT Annual. Culms erect; 100–200 cm long; with prop roots. Lateral branches ample. Leaf-sheaths hirsute; with tubercle-based hairs. Ligule an eciliate membrane; 1–6 mm long. Leaf-blades linear, or lanceolate; 50–100 cm long; 10–20 mm wide; stiff. Leaf-blade surface hirsute; hairy on both sides; with tubercle-based hairs. Leaf-blade margins spinulose. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence composed of racemes; terminal and axillary; subtended by an inflated leaf-sheath. Peduncle antrorsely scabrous above; widened at apex.

Racemes 1; single; arcuate; unilateral; 3–5 cm long. Rhachis fragile at the nodes; subcylindrical and excavated; 3 mm wide; glabrous on margins. Spikelet packing abaxial; regular. Rhachis internodes oblong; 4 mm long. Rhachis internode tip transverse; crateriform; with simple rim.

Spikelets sunken; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels fused to internode; united wholly; columnar; flattened.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas; orbicular; dorsally compressed; 1.5 mm long; deciduous with the fertile. Companion sterile spikelet glumes coriaceous; smooth; glabrous; emarginate; muticous. Companion sterile spikelet lemmas enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; gibbous; 5–5.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus glabrous; base truncate; with central peg; attached transversely.

GLUMES Glumes dissimilar; reaching apex of florets; firmer than fertile lemma. Lower glume ovate; 1 length of spikelet; indurate; 2-keeled; 7–9 -veined. Lower glume surface flat, or concave. Lower glume apex obtuse. Upper glume ovate; chartaceous; 1-keeled. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret oblong; 3.5 mm long; hyaline; 3 -veined; obtuse. Fertile lemma oblong; 2.5 mm long; hyaline; 1 -veined. Lemma apex obtuse. Palea hyaline; without keels.

FLOWER Anthers 3; 2 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Bor.

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