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Descriptions

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

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

Hackelochloa

HABIT Annual. Culms erect; 5–63.75–100 cm long. Lateral branches fastigiate (1/1). Ligule a ciliolate membrane. Leaf-blades linear, or lanceolate.

INFLORESCENCE Synflorescence compound; scanty. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole; exserted, or embraced at base by subtending leaf. Spatheole linear, or lanceolate (1).

Racemes single. Rhachis fragile at the nodes; flattened. Rhachis internodes oblong; adherent to upper glume of sessile spikelet. 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 fused to internode; oblong.

STERILE SPIKELETS Companion sterile spikelets well-developed; deciduous with the fertile. Companion sterile spikelet glumes muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong (1), or orbicular (1); dorsally compressed; 1.5–2.125–2.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus base truncate; with central peg; attached transversely.

GLUMES Glumes exceeding apex of florets; firmer than fertile lemma. Lower glume orbicular; indurate; without keels. Lower glume surface rugose (1), or cancellate (1), or areolate (1); without pits. Lower glume apex obtuse. Upper glume oblong; cartilaginous; without keels; 3 -veined. Upper glume apex obtuse.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret ovate; hyaline; 0 -veined; obtuse. Fertile lemma ovate; hyaline; without keel; wingless; 0 -veined. Lemma surface unwrinkled; without grooves. Lemma apex obtuse, or acute (1). Palea hyaline; 0 -veined; without keels.

FLOWER Lodicules 1 (1/1).

FRUIT Caryopsis with adherent pericarp (1/1); orbicular (1/1); dorsally compressed (1/1).

DISTRIBUTION Africa (1), or Temperate Asia, or Tropical Asia, or Australasia (1), or Pacific (1), or North America (1), or South America (1).

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