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.

Coelorachis ramosa

HABIT Perennial; caespitose. Basal innovations flabellate. Culms erect; 75–125 cm long; 1–3 mm diam. Culm-internodes solid. Culm-nodes brown. Lateral branches ample; arising from mid culm and upper culm. Leaf-sheaths keeled. Ligule a ciliolate membrane; 0.5–1 mm long. Leaf-blades 30–60 cm long; 3–7 mm wide.

INFLORESCENCE Inflorescence composed of racemes; terminal and axillary.

Racemes 1; single; 7–13 cm long; 5 mm wide. Rhachis fragile at the nodes; angular. Rhachis internodes columnar; 3.5–4.5 mm long. Rhachis internode tip transverse; crateriform.

Spikelets appressed; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels columnar; tip cupuliform; auriculate.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; oblong; dorsally compressed; 3.5–4.5 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes winged on keels. Companion sterile spikelet lemmas 2; enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 4–5.5 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; 3–4 mm long; hyaline; obtuse. Fertile lemma elliptic; 3–3.5 mm long; hyaline; without keel; 0–1 -veined. Lemma apex obtuse. Palea hyaline.

FLOWER Anthers 3; 1.2 mm long.

DISTRIBUTION North America: Mexico. South America: Mesoamericana and northern South America.

NOTES Andropogoneae. Fl Costa Rica.

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