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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 pseudoichu
HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; robust; 70–200 cm long; 5–7 -noded. Culm-internodes distally pubescent. Culm-nodes glabrous. Lateral branches lacking. Leaves heterophyllous being wider on the culm (3–6mm). Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs ciliate; 3–4 mm long. Ligule an eciliate membrane; 0.75–1.5 mm long; pubescent on abaxial surface; truncate. Leaf-blades filiform; convolute; 0.5 mm wide. Leaf-blade venation with continuous uniform subepidermal sclerenchyma layer on the underside. Leaf-blade surface ribbed; scaberulous. Leaf-blade apex hardened.
INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.
Panicle open; lanceolate; 30–60 cm long. Panicle branches scaberulous.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 7–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief; 0.15–0.2 mm long; pubescent; acute.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; without keels; 1(–3) -veined. Lower glume lateral veins absent, or obscure. Lower glume apex acuminate. Upper glume lanceolate; 7–8 mm long; membranous; without keels; 3 -veined. Upper glume apex acuminate.
FLORETS Fertile lemma lanceolate; subterete; 2–2.5 mm long; membranous; without keel; 5 -veined. Lemma surface pubescent; with conspicuous apical hairs. Lemma margins flat; covering most of palea. Lemma hairs 3–4 mm long. Lemma apex surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn geniculate; 10–15 mm long overall; with a straight or slightly twisted column. Palea 1 mm long; 0.4 length of lemma; 0 -veined; without keels. Palea surface pilose.
FLOWER Lodicules 3; 0.7 mm long. Anthers 3; anther tip penicillate. Stigmas 2. Ovary glabrous.
FRUIT Caryopsis with adherent pericarp; fusiform; 1.8–2 mm long; dark brown. Hilum linear; 0.5 length of caryopsis.
DISTRIBUTION South America: western South America and southern South America.
NOTES Stipeae. Caro 1995.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
