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.

Chionachne macrophylla

HABIT Perennial; caespitose. Culms erect; robust; 200–300 cm long; with prop roots. Culm-nodes bearded. Ligule an eciliate membrane; 0.5 mm long. Leaf-blades linear, or lanceolate; 30–90 cm long; 20–80 mm wide. Leaf-blade margins scabrous.

INFLORESCENCE Monoecious; with male and female spikelets in the same inflorescence. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole.

Racemes 1; single; 5–10 cm long. Rhachis fragile at the nodes; flattened; glabrous on surface, or pubescent on surface. Rhachis internodes oblong; 5–7 mm long; bearing a sterile companion laterally. Rhachis internode tip transverse; crateriform.

Sexes segregated; on bisexual branches; with male above. Spikelets embracing internode; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Male spikelets sessile and pedicelled; 2 in a cluster. Pedicels fused to internode; united wholly.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; laterally compressed; 9–12 mm long; as long as fertile. Companion sterile spikelet glumes chartaceous; without keels.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 9–12 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus base truncate; attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; indurate; pallid; 2-keeled; keeled above; keeled laterally; winged on keel; winged above. Lower glume surface asperulous; not waisted. Lower glume apex obtuse. Upper glume ovate; cartilaginous. Upper glume apex cuspidate.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret ovate; hyaline; cuspidate. Fertile florets female. Fertile lemma lanceolate; hyaline; without keel; 3 -veined. Lemma apex acute. Palea 1 length of lemma; hyaline.

MALE Male spikelets distinct from female; with pedicels fused to rhachis; 2 flowered; lanceolate; 9–12 mm long. Male spikelet glumes 2.

DISTRIBUTION Asia-tropical: Malesia and Papuasia. Pacific: north-central.

NOTES Andropogoneae. WDC.

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