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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 feresetaceum
HABIT Perennial; caespitose. Culms 50–100 cm long; 0.4–1.2 mm diam.; compressible; 3 -noded. Culm-internodes striate, or ridged; smooth, or scaberulous. Culm-nodes swollen; pubescent. Lateral branches lacking. Leaf-sheaths ribbed; smooth, or scaberulous; outer margin glabrous. Ligule an eciliate membrane; 3.5–8 mm long; acute, or acuminate. Leaf-blades convolute; 15–30 cm long; 0.7–0.9 mm wide. Leaf-blade surface ribbed; scaberulous; rough abaxially; puberulous; hairy adaxially.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear; 6–12 cm long; 0.5–1 cm wide. Primary panicle branches 0.1–2.5 cm long. Panicle axis scaberulous. Panicle branches scaberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels angular; 2–7 mm long; scaberulous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 4–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 0.7–1.4 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; 4–7 mm long; 1 length of upper glume; membranous; without keels; 3 -veined. Lower glume surface smooth, or asperulous. Lower glume apex acute. Upper glume lanceolate; 4–6 mm long; membranous; without keels; 3–5 -veined. Upper glume surface smooth, or asperulous. Upper glume apex acute.
FLORETS Fertile lemma oblanceolate; subterete; 3–4.5 mm long; coriaceous; without keel; 5 -veined. Lemma surface smooth, or granulose; pubescent. Lemma margins involute; interlocking with palea keels. Lemma hairs 0.5–1 mm long. Lemma apex awned; 1 -awned. Principal lemma awn bigeniculate; 12–18 mm long overall; with twisted column. Middle segment of lemma awn 3–4 mm long. Column of lemma awn 3.5–6 mm long. Palea 1 length of lemma; 2 -veined. Palea keels contiguous above a sulcus. Palea surface pubescent; hairy on back.
FLOWER Lodicules 3; 0.5–0.8 mm long. Anthers 3; 1.4–1.8 mm long; anther tip smooth. Stigmas 2.
FRUIT Caryopsis with adherent pericarp; 2–2.5 mm long. Embryo 0.3–0.4 length of caryopsis. Hilum linear; 0.8–1 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.
