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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.
Stipa aristiglumis
HABIT Perennial; caespitose. Culms erect; 100–200 cm long; 2.5 mm diam.; 3 -noded. Culm-internodes distally glabrous, or pubescent. Culm-nodes pubescent. Lateral branches lacking. Leaf-sheaths ribbed; smooth, or scaberulous; outer margin hairy. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 0.8–3 mm long; truncate, or obtuse. Leaf-blades flat, or convolute; 20–40 cm long; 3–6 mm wide. Leaf-blade surface smooth, or scaberulous; rough adaxially, or on both sides. Leaf-blade apex pungent.
INFLORESCENCE Inflorescence a panicle.
Panicle open; 20–40 cm long; 6–10 cm wide. Primary panicle branches 10–20 cm long. Panicle branches scaberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels flattened; 6–12 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 8–14 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.4–1 mm long; pubescent; pungent.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume oblong; 8–14 mm long; 1 length of upper glume; membranous; without keels; 3 -veined. Lower glume surface smooth, or asperulous; rough generally, or on veins. Lower glume apex attenuate, or setaceously attenuate. Upper glume oblong; 6–12 mm long; membranous; without keels; 5 -veined. Upper glume surface smooth, or asperulous; rough generally, or on veins. Upper glume apex attenuate, or setaceously attenuate.
FLORETS Fertile lemma elliptic; subterete; 4–7.5 mm long; cartilaginous; light brown, or dark brown; without keel; 5 -veined. Lemma surface pubescent; hairy below. Lemma margins flat; covering most of palea. Lemma hairs yellow. Lemma apex surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn bigeniculate; 25–40 mm long overall; with twisted column. Middle segment of lemma awn 6–8 mm long. Column of lemma awn 4–9 mm long. Palea 0.8 length of lemma; 2 -veined; without keels.
FLOWER Lodicules 3; 0.5–1.8 mm long. Anthers 3; 2–3 mm long; anther tip smooth. Stigmas 2.
FRUIT Caryopsis with adherent pericarp; 3–4.5 mm long. Embryo 0.33–0.5 length of caryopsis. Hilum linear; 0.75–0.9 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.
