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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.
Tripogon nicorae
HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms erect; 4–22 cm long. Leaf-sheaths without keel; striately veined; glabrous on surface. Leaf-sheath oral hairs ciliate; 0.5 mm long. Ligule a ciliolate membrane; 0.2–0.3 mm long. Leaf-blades filiform; conduplicate; 1.5–5 cm long; 0.6–0.8 mm wide. Leaf-blade surface pilose; hairy adaxially. Leaf-blade margins scaberulous.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 1; single; unilateral; 1.5–9 cm long. Rhachis 0.5–0.6 mm wide; scaberulous on margins. Spikelet packing broadside to rhachis.
Spikelets appressed; solitary. Fertile spikelets sessile.
FERTILE SPIKELETS Spikelets comprising 8–17 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 9–14 mm long; 1.6–2 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.6–0.9 mm long; glabrous. Floret callus pilose; with elliptic scar. Floret callus hairs 0.5–1 mm long.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2–2.6 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute, or acuminate. Upper glume lanceolate; 2.6–3.5 mm long; 0.9–1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute, or acuminate; muticous, or mucronate.
FLORETS Fertile lemma ovate; widest at 0.5 of its length from base; 3–3.3 mm long; membranous; without keel; 3 -veined. Lemma lateral veins excurrent. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; 1.2–2 mm long overall. Palea 2–2.7 mm long; 0.66 length of lemma; 2 -veined. Palea keels winged; scaberulous; ciliolate. Palea apex dentate; 2 -fid; with excurrent keel veins. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2; 0.3 mm long; truncate. Anthers 3; 0.2–0.5 mm long; purple. Stigmas 2.
FRUIT Caryopsis with adherent pericarp; lanceolate; trigonous; 1.3–1.6 mm long. Embryo 0.33–0.5 length of caryopsis. Hilum elliptic.
DISTRIBUTION South America: western South America.
NOTES Eragrostideae. Rugolo & Vega 2007.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
