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Descriptions

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

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

Tristachya angustifolia

HABIT Perennial; caespitose. Culms erect; 60–100 cm long. Leaf-sheaths glabrous on surface. Ligule a fringe of hairs. Leaf-blades 20–25 cm long; 3–4 mm wide. Leaf-blade surface scabrous; rough adaxially; glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 10–15 cm long. Primary panicle branches indistinct the panicle almost racemose; 3–6 cm long.

Spikelets in threes. Fertile spikelets pedicelled; 3 in the cluster. Pedicels free; unequal.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; compressed slightly; 20 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; pubescent; pungent.

GLUMES Glumes persistent; dissimilar; exceeding apex of florets. Lower glume lanceolate; 12–15 mm long; 0.66–0.75 length of spikelet; chartaceous; dark brown; without keels; 3 -veined. Lower glume surface smooth, or asperulous; rough on veins; glabrous. Lower glume apex acute. Upper glume lanceolate; 1 length of spikelet; chartaceous; without keels; 3 -veined. Upper glume surface glabrous. Upper glume apex obtuse.

FLORETS Basal sterile florets male; with palea; separately deciduous. Lemma of lower sterile floret similar to upper glume; lanceolate; 1 length of spikelet; chartaceous; 5–7 -veined; acute. Fertile lemma oblong; 8 mm long; coriaceous; without keel. Lemma surface pubescent. Lemma margins involute; interlocking with palea keels. Lemma apex lobed; 2 -fid; with lanceolate lobes; with lobes 1 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; subterete below; 32–35 mm long overall; with twisted column; deciduous; abscissing from top of lemma. Palea 2 -veined. Palea keels approximate; thickened; winged; narrowly winged.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION North America: Mexico.

NOTES Arundinelleae. Hitchcock 1992.

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