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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 subplumosa
HABIT Perennial; caespitose. Butt sheaths pubescent. Culms 60 cm long; 3 mm diam.; 2–3 -noded. Culm-internodes smooth; distally glabrous. Culm-nodes constricted, or flush with internodes; brown. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface. Leaf-sheath oral hairs ciliate; 1.5–2 mm long. Ligule a ciliolate membrane; 3–4 mm long; 1–1.5 mm long on basal shoots. Leaf-blades conduplicate; 4–12 cm long; 0.5–1 mm wide; coriaceous. Leaf-blade surface smooth; glabrous. Leaf-blade apex acute; pungent.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear; 10–20 cm long.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–7 mm long; scabrous; ciliate; hairy at tip.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 13.5–17 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 2 mm long; pilose; pungent.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 13–17 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein eciliate, or ciliolate. Lower glume apex acuminate. Upper glume lanceolate; 13–17 mm long; membranous; without keels; 5 -veined. Upper glume apex acuminate.
FLORETS Fertile lemma lanceolate; subterete; 9–9.3 mm long; coriaceous; yellow; without keel; 5 -veined. Lemma surface villous. Lemma margins convolute; covering most of palea. Lemma hairs 2–3 mm long. Lemma apex awned; 1 -awned. Principal lemma awn geniculate; 55–60 mm long overall; with twisted column; limb ciliate; with 1.5–2 mm long hairs; glabrescent towards tip. Column of lemma awn 18–22 mm long; ciliate; with 1.5–2 mm long hairs. Palea 7–8 mm long; 2 -veined; without keels. Palea surface villous.
FLOWER Lodicules 3. Anthers 3; 5 mm long; yellow; anther tip penicillate. Stigmas 2. Ovary glabrous.
FRUIT Caryopsis with adherent pericarp; fusiform. Hilum linear.
DISTRIBUTION South America: southern South America.
NOTES Stipeae. Fl Pat 1995.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
