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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.
Nassella rosengurttii
HABIT Perennial; caespitose. Butt sheaths pubescent. Culms erect; 25–85 cm long; 2–3 -noded. Culm-nodes pubescent. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1 mm long. Leaf-blades filiform; involute; 6–12 cm long; 1 mm wide. Leaf-blade surface ribbed; scaberulous.
INFLORESCENCE Inflorescence a panicle.
Panicle open; lanceolate; 4–6 cm long. Panicle branches scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1.5–3 mm long; puberulous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 6–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief; pilose; acute.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 6–7 mm long; 1.2 length of upper glume; membranous; without keels; 3 -veined. Lower glume apex acuminate. Upper glume lanceolate; 5–5.5 mm long; membranous; without keels; 3 -veined. Upper glume apex acuminate.
FLORETS Fertile lemma obovate; subterete; 3.3–3.4 mm long; coriaceous; without keel; 5 -veined. Lemma midvein pubescent. Lemma surface tuberculate. Lemma margins convolute; covering most of palea. Lemma apex surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn bigeniculate; 18–20 mm long overall; with twisted column. Palea 0 -veined; without keels.
FLOWER Anthers 3. Stigmas 2. Ovary glabrous.
FRUIT Caryopsis with adherent pericarp; fusiform. Hilum linear.
DISTRIBUTION South America: Brazil and southern South America.
NOTES Stipeae. Chase 1995.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.