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Descriptions

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

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

Trachypogon macroglossus

HABIT Perennial; caespitose. Rootstock evident. Culms 40–100 cm long; wiry. Culm-nodes bearded. Leaf-sheath auricles absent, or erect; 3–5(–50) mm long. Ligule an eciliate membrane; 3–5(–50) mm long. Leaf-blades filiform; convolute; 8–45 cm long; 1–2 mm wide.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; straight, or flexuous; 5–15.5 cm long. Rhachis tough; subterete. Rhachis internodes linear. Rhachis internode tip oblique; flat.

Spikelets in pairs. Fertile spikelets pedicelled; 1 in the cluster; on longer pedicels than sterile. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels linear; tip oblique.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; oblong; dorsally compressed; 5–6 mm long; shorter than fertile; persistent. Companion sterile spikelet glumes chartaceous; winged on margins (narrowly); distinctly veined; pilose; emarginate, or truncate, or obtuse. Companion sterile spikelet lemmas 2; enclosed by glumes; muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 6.5–8.5 mm long; falling entire. Spikelet callus linear; 1.5 mm long; bearded; base pungent; attached obliquely. Spikelet callus hairs white.

GLUMES Glumes dissimilar; firmer than fertile lemma; dull, or shiny. Lower glume oblong; 1 length of spikelet; coriaceous; grey to dark brown; without keels. Lower glume surface pilose.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 0.9 length of spikelet; hyaline; 2 -veined; ciliate on margins; obtuse. Fertile lemma linear; 3.5 mm long; hyaline; without keel; 3 -veined. Lemma apex entire; acute; awned; 1 -awned. Principal lemma awn apical; geniculate; 15–45(–65) mm long overall; with twisted column; limb puberulous (limb). Column of lemma awn hirsute. Palea absent or minute.

DISTRIBUTION South America: Brazil.

NOTES Andropogoneae. Gr Bahia.

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