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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.
Aristida sayapensis
HABIT Perennial; caespitose. Basal innovations intravaginal; subterete. Culms erect; 30–50 cm long; 2–3 -noded. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface. Leaf-sheath oral hairs bearded; 3–4 mm long. Ligule a fringe of hairs. Collar glabrous. Leaf-blades flat, or convolute; 7–15.5 cm long; 2 mm wide. Leaf-blade surface scabrous; rough adaxially; glabrous; hairless except near base. Leaf-blade margins scabrous. Leaf-blade apex attenuate; filiform.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear; bearing few spikelets. Panicle branches scaberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 15–17 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 1 mm long; pubescent; acute.
GLUMES Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume linear; 13–17 mm long; 0.9–1 length of upper glume; membranous; 3 -veined. Lower glume primary vein ciliolate. Lower glume lateral veins absent, or obscure. Lower glume apex awned; 1 -awned. Lower glume awn 1–1.5 mm long. Upper glume linear; 15–17 mm long; 1.5 length of adjacent fertile lemma; membranous; 1 -veined. Upper glume primary vein smooth. Upper glume lateral veins absent. Upper glume apex dentate; 2 -fid; mucronate, or awned; 1 -awned. Upper glume awn 0.5–1 mm long.
FLORETS Fertile lemma linear; subterete; 10–11 mm long; coriaceous; without keel; 3 -veined. Lemma surface scaberulous. Lemma margins convolute; covering most of palea. Lemma apex awned; 3 -awned. Principal lemma awn with 40–45 mm long limb. Lateral lemma awns 35–40 mm long; subequal to principal, or shorter than principal. Palea 1.75–2 mm long; 0.1–0.2 length of lemma; hyaline; 0 -veined.
FLOWER Lodicules 2; 1.75 mm long. Anthers 3.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION South America: southern South America.
NOTES Aristideae. Caro 1997.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
