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Descriptions

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

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

Piptochaetium hackelii

HABIT Perennial; caespitose. Culms erect; 60–100 cm long; 2–3 -noded. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1–2 mm long; truncate, or obtuse. Leaf-blades convolute; 15–30 cm long; 1–1.5 mm wide. Leaf-blade venation with 3 secondary veins. Leaf-blade surface scabrous; rough adaxially.

INFLORESCENCE Inflorescence a panicle; comprising 5–18 fertile spikelets; embraced at base by subtending leaf.

Panicle open; nodding; 8–10 cm long; bearing few spikelets.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 21–30 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 4 mm long; pubescent; obtuse.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 21–30 mm long; 1.1 length of upper glume; hyaline; dark brown, or purple; without keels; 5–7 -veined. Lower glume apex setaceously attenuate. Upper glume lanceolate; 18–25 mm long; hyaline; dark brown, or purple; without keels; 5–7 -veined. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma oblong; laterally compressed; 10.5–11.5 mm long; indurate; dark brown, or black; without keel. Lemma surface striate. Lemma margins involute; interlocking with palea keels. Lemma apex scabrous; surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn median; bigeniculate; 80–100 mm long overall; with twisted column. Column of lemma awn 50–60 mm long; puberulous. Palea 1 length of lemma; 2 -veined. Palea keels contiguous above a sulcus.

FLOWER Anthers 3; 4 mm long; anther tip penicillate.

FRUIT Caryopsis with adherent pericarp; fusiform; 6 mm long. Embryo 0.2 length of caryopsis. Hilum linear; 1 length of caryopsis.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Parodi 1995.

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