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Descriptions

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

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

Andropogon floridanus

HABIT Perennial; caespitose. Culms 50–160 cm long. Lateral branches ample. Leaf-sheaths antrorsely scabrous. Ligule an eciliate membrane. Leaf-blades 25–50 cm long; 2–6 mm wide. Leaf-blade surface scabrous.

INFLORESCENCE Synflorescence compound; paniculate. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole; exserted, or embraced at base by subtending leaf. Spatheole linear, or lanceolate; 4–5 cm long. Peduncle 1 cm long, or 2 cm long; hirsute above.

Racemes 2; paired; 3–4 cm long. Rhachis fragile at the nodes; plumose on margins. Rhachis hairs 5–8 mm long. Rhachis internodes clavate; 3–3.5 mm long. Rhachis internode tip transverse; cupuliform; with simple rim.

Spikelets appressed, or ascending; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; curved; 4–5 mm long; plumose; with 5–8 mm long hairs.

STERILE SPIKELETS Companion sterile spikelets represented by barren pedicels, or represented by single glumes; linear; 1 mm long; shorter than fertile.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 3.5–4 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pubescent; base obtuse; inserted.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; coriaceous; 2-keeled; keeled dorsally. Lower glume primary vein ciliate. Lower glume intercarinal veins absent. Lower glume surface concave. Upper glume lanceolate; membranous; 1-keeled. Upper glume muticous.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline. Fertile lemma lanceolate; hyaline; without keel. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; straight, or geniculate; 8–12 mm long overall; with a straight or slightly twisted column. Column of lemma awn glabrous.

FLOWER Anthers 1.

DISTRIBUTION North America: southeast USA.

NOTES Andropogoneae. Man Gr US 1994.

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