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Descriptions

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

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

Aristida friesii

HABIT Perennial; caespitose. Culms erect; 30–50 cm long. Culm-internodes antrorsely scabrous. Lateral branches lacking. Leaf-sheaths longer than adjacent culm internode; antrorsely scabrous. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades 20–30 cm long; 3 mm wide. Leaf-blade surface scabrous; rough on both sides; glabrous; hairless except near base. Leaf-blade margins scabrous. Leaf-blade apex acuminate; filiform.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle open; elliptic; 15 cm long; contracted about primary branches. Primary panicle branches appressed, or ascending; 1–3 -nate. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels angular; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.25 mm long; pubescent; obtuse.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 7 mm long; 0.85 length of upper glume; membranous; 3 -veined. Lower glume primary vein scabrous. Lower glume surface scabrous; rough on veins. Lower glume apex acuminate; mucronate. Upper glume lanceolate; 8 mm long; membranous; 1 -veined. Upper glume primary vein smooth. Upper glume lateral veins absent. Upper glume apex dentate; 2 -fid; acuminate; mucronate.

FLORETS Fertile lemma linear; subterete; 7–8 mm long; coriaceous; without keel; 3 -veined. Lemma surface granulose. Lemma margins convolute; covering most of palea. Lemma apex with a short cylindrical neck; awned; 3 -awned. Principal lemma awn 3-branched; with 9–10 mm long limb. Lateral lemma awns 8 mm long; shorter than principal.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp; fusiform; without sulcus. Hilum linear.

DISTRIBUTION South America: western South America.

NOTES Aristideae. Henrard 1995.

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