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Descriptions

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

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

Coelorachis selloana

HABIT Perennial; caespitose. Rhizomes short. Basal innovations flabellate. Culms erect; 10–75 cm long; 2–8 -noded. Leaf-sheaths keeled. Ligule a ciliolate membrane. Leaf-blades flat, or conduplicate; 5–35 cm long; 2–6 mm wide.

INFLORESCENCE Inflorescence composed of racemes; terminal and axillary; embraced at base by subtending leaf.

Racemes 1; single; straight, or arcuate; smoothly terete; 7–12 cm long. Rhachis fragile at the nodes; semiterete. Rhachis internodes cuneate; 4–5 mm long. Rhachis internode tip transverse; crateriform.

Spikelets sunken; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels oblong; flattened; 3.5–4.5 mm long; tip cupuliform.

STERILE SPIKELETS Companion sterile spikelets rudimentary; comprising 2 subequal glumes without lemmas; oblong; dorsally compressed; 1–1.5 mm long; shorter than fertile; fused to and deciduous with fertile spikelet belonging to segment above. Companion sterile spikelet glumes winged on keels.

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

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; coriaceous; 2-keeled; winged on keel; winged narrowly; winged above. Lower glume surface convex; areolate. Lower glume apex emarginate. Upper glume oblong; chartaceous; 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret oblong; hyaline; obtuse. Fertile lemma elliptic; hyaline; without keel; 0–1 -veined. Lemma apex obtuse. Palea hyaline.

FLOWER Anthers 3.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Andropogoneae. Quarin.

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