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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Piptochaetium setaceum
HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 40–80 cm long; 1 mm diam.; 2–4 -noded. Culm-internodes ridged; distally glabrous, or pubescent. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths tight; ribbed; smooth, or scaberulous; outer margin glabrous. Ligule an eciliate membrane; 2–9 mm long; obtuse. Leaf-blades conduplicate, or involute; 15–30 cm long; 0.5–1.5 mm wide. Leaf-blade surface ribbed; puberulous; hairy adaxially. Leaf-blade margins smooth, or scaberulous.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear; 10–20 cm long; 1.5–3 cm wide. Primary panicle branches 1.5–4.5 cm long. Panicle branches scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1.5–7.5 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 9–15 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1.7–2.5 mm long; pubescent; acute. Floret callus hairs 0.1–1 mm long.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate; 9–15 mm long; 1.3–1.5 length of upper glume; hyaline; without keels; 3 -veined. Lower glume surface smooth, or asperulous; rough at apex. Lower glume apex acuminate. Upper glume lanceolate; 7–10 mm long; hyaline; without keels; 5 -veined. Upper glume surface smooth, or asperulous; rough at apex. Upper glume apex acuminate.
FLORETS Fertile lemma oblanceolate; subterete; 5.5–7 mm long; coriaceous; black; without keel; 5 -veined. Lemma surface scaberulous; with a median groove; pubescent. Lemma margins involute; interlocking with palea keels. Lemma hairs 0.4–0.8 mm long. Lemma apex with a short cylindrical neck; awned; 1 -awned. Principal lemma awn eccentric; bigeniculate; 25–40 mm long overall; with twisted column. Middle segment of lemma awn 5–7 mm long. Column of lemma awn 5–8 mm long; puberulous. Palea 1 length of lemma; 2 -veined. Palea keels contiguous above a sulcus.
FLOWER Lodicules 3; 0.4–1.5 mm long. Anthers 3; 2.1–2.3 mm long; anther tip smooth. Stigmas 2.
FRUIT Caryopsis with adherent pericarp; sulcate on hilar side; 2.5–3 mm long. Embryo 0.2–0.4 length of caryopsis. Hilum linear; 0.7–0.8 length of caryopsis.
DISTRIBUTION Australasia: Australia.
NOTES Stipeae. Vickery etc 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
