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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Tripogon ekmanii

HABIT Perennial; caespitose. Butt sheaths woolly; persistent and investing base of culm; with fibrous dead sheaths. Culms erect; 45–65 cm long; 2–3 -noded. Leaf-sheaths mostly shorter than adjacent culm internode. Ligule a ciliolate membrane. Leaf-blades flexuous; conduplicate; 3–10 cm long; 1 mm wide. Leaf-blade surface scaberulous; rough adaxially. Leaf-blade margins scabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; unilateral; 10–15 cm long. Rhachis flattened. Spikelet packing broadside to rhachis; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels reduced to a stump.

FERTILE SPIKELETS Spikelets comprising 8–13 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 11–17.5 mm long; 1.4–2.2 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.9–1.4 mm long. Floret callus pilose. Floret callus hairs 1 mm long.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3–4.5 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4.2–5.5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 4–6.2 mm long; membranous; without keel; 3 -veined. Lemma lateral veins extending close to apex. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; 1.3–1.75 mm long overall. Palea 2.8–3.2 mm long; 0.75 length of lemma; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; 0.3–0.5 mm long. Anthers 3; 1.4–1.6 mm long.

FRUIT Caryopsis with adherent pericarp; ovoid; trigonous; 2–2.3 mm long; dark brown. Embryo 0.5 length of caryopsis. Hilum punctiform.

DISTRIBUTION South America: southern South America.

NOTES Eragrostideae. Nic & Rug 1997.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.