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Descriptions

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

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

Eragrostis hackelii

HABIT Annual. Culms erect; robust; 150–250 cm long; 8 -noded. Culm-internodes terete; glandular (below nodes); distally glabrous. Lateral branches sparse; arising from lower culm. Leaf-sheaths mostly shorter than adjacent culm internode; glandular (on veins); pilose; with tubercle-based hairs. Ligule a fringe of hairs. Leaf-blades linear, or lanceolate; 40 cm long; 15 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface scaberulous; rough adaxially; glabrous; hairless except near base. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or ovate; 25–50 cm long. Primary panicle branches 15–25 cm long. Panicle axis scaberulous. Panicle branches capillary; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 10–14 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 8–10 mm long; 1.5 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas.

GLUMES Glumes similar; shorter than spikelet. Lower glume linear, or lanceolate; 1.8 mm long; 1 length of upper glume; hyaline; without keels; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume linear, or lanceolate; 1.8 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 2 mm long; membranous; keeled; 3 -veined. Lemma midvein scaberulous. Lemma lateral veins prominent. Lemma apex acuminate. Palea elliptic, or oblong. Palea keels scaberulous. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 0.6 mm long.

FRUIT Caryopsis with adherent pericarp; oblong; 0.8 mm long.

DISTRIBUTION South America: southern South America.

NOTES Eragrostideae. Hackel 2010.

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