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Descriptions

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

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

Streptostachys asperifolia

HABIT Perennial; caespitose. Culms 35–80 cm long. Ligule a fringe of hairs. Leaf-blade base cordate, or amplexicaul. Leaf-blades lanceolate; 14–25 cm long; 10–14 mm wide. Leaf-blade surface pilose; hairy abaxially. Leaf-blade margins tuberculate-ciliate. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong, or obovate; 5–13 cm long; contracted about primary branches. Primary panicle branches ascending, or spreading; simple. Panicle branches stiff; straight; pubescent in axils.

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

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; with truncate base; dorsally compressed; obtuse; 3.5–4.5(–5) mm long; falling entire. Spikelet callus toroidal; incorporating lowest rhachilla internode with adnate lower glume and supplemented by thickened base of upper glume. Rhachilla internodes elongated between glumes and elongated below basal sterile floret. Rhachilla elongation stout.

GLUMES Glumes dissimilar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 0.66–0.8 length of spikelet; membranous; without keels; 5 -veined. Lower glume surface pubescent. Lower glume apex acute. Upper glume ovate; membranous; without keels; 5 -veined. Upper glume surface pubescent. Upper glume apex obtuse.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 5 -veined; obtuse. Fertile lemma ovate; 3.5–4.5 mm long; indurate; without keel. Lemma margins involute. Lemma apex obtuse; pubescent. Palea 1 length of lemma; indurate; without keels.

FLOWER Lodicules 2; cuneate; fleshy.

FRUIT Caryopsis with adherent pericarp; ellipsoid; dorsally compressed; 2.5–3 mm long. Embryo 0.4 length of caryopsis. Hilum linear; 1 length of caryopsis.

DISTRIBUTION South America: Caribbean, northern South America, and Brazil.

NOTES Paniceae. WDC.

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