Anthaenantiopsis trachystachya

HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms 60–80 cm long. Ligule an eciliate membrane. Leaf-blades convolute; 5–30 cm long; 2–4 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 4–7; borne along a central axis; unilateral; 1–2 cm long. Central inflorescence axis 7–10 cm long. Rhachis angular; ciliate on margins. Spikelet packing lax.

Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels linear, or oblong; unequal; ciliate.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; compressed slightly; obtuse; 3 mm long; falling entire.

GLUMES Glumes one the lower absent or obscure, or two; dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 0–1.5 mm long; 0–0.5 length of spikelet; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume surface villous. Upper glume ovate; membranous; without keels; 5 -veined. Upper glume lateral veins ribbed. Upper glume surface villous. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 5 -veined; ribbed; villous; bearing hairs 0.5–1 mm long; acute. Fertile lemma ovate; 3 mm long; coriaceous; without keel; 5 -veined. Lemma margins involute. Lemma apex acute; pubescent. Palea gaping; 1 length of lemma; coriaceous; 2 -veined.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Paniceae. WDC.

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