GrassBase - The Online World Grass Flora

Descriptions

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

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

Ratzeburgia

HABIT Perennial. Stolons present. Culms 10–30 cm long. Ligule an eciliate membrane.

INFLORESCENCE Inflorescence composed of racemes.

Racemes single. Rhachis fragile at the nodes; angular. Rhachis internodes linear; together with the pedicel framing edges of sessile spikelets. Rhachis internode tip transverse; crateriform.

Spikelets squeezed between internode and pedicel; in threes. Fertile spikelets sessile; 2 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels linear.

STERILE SPIKELETS Companion sterile spikelets rudimentary.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 4.565–6.6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus base truncate; with central boss; attached transversely.

GLUMES Glumes exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; indurate; 2-keeled; winged on keel. Lower glume surface cancellate; without pits. Upper glume oblong; coriaceous; 2-keeled; 3 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; 0 -veined; acute. Fertile lemma oblong; hyaline; without keel; wingless; 2 -veined. Lemma surface unwrinkled; without grooves. Lemma margins ciliolate. Lemma apex acute. Palea absent or minute.

DISTRIBUTION Tropical Asia.

Please cite this publication as detailed in How to Cite Version: 27th January 2014.