Log In
New Account
Sitemap
Home
Specimen Search
Search Collections
Map Search
Exsiccati Search
Images
Browse
Search
Flora Projects
State Inventories
Indiana
Ohio
Wisconsin
Aquatic Invasive Plant Guide
Interactive Tools
Dynamic Checklist
Dynamic Key
Crowdsource
Cyperus giganteus
Vahl
Family:
Cyperaceae
Giant Flat Sedge
FNA
Resources
Gordon C. Tucker*, Brian G. Marcks* & J. Richard Carter * in Flora of North America (vol. 23)
Herbs, perennial, rhizomatous, stout. Culms roundly trigonous, 200-350 cm × 15-50 mm, glabrous. Leaves bladeless. Inflorescences: spikes loosely cylindric, 15-40 × 8-16 mm; rays 5-8, ascending to erect, stiff,20-30 cm; 2d order rays 5-15 cm; bracts 10-12, ascending at 30-60°, flat, (8-) 20-45 cm × 4-12 mm; 2d order bracts (5-)15-25 cm × 1.5-5 mm; rachilla persistent, separating laterally, remaining firmly attached basally, wings 0.3-0.4 mm wide. Spikelets (15-)50-80, slightly compressed, linear, ± quadrangular, 5-12 × 0.6-1.4 mm; floral scales 8-20, appressed, reddish beside 5-ribbed green medial part, white to hyaline near margins, ovate, 1.8-2.2 × 1.2-1.5 mm, apex acute to obtuse. Flowers: anthers 0.7-1 mm (connective prolonged beyond anther as red subulate appendage 0.2-0.5 mm, its apex sometimes setose); styles 0.2-0.5 mm; stigmas (0.8-)1.2-1.8 mm. Achenes pale brown, sessile, oblong, 0.9-1 × 0.4-0.5 mm, apex scarcely apiculate, surfaces puncticulate.
Fruiting summer. Stream banks, marshes; 0-10 m; introduced; La., Tex.; Mexico; West Indies; Central America; South America.
Cyperus giganteus was erroneously reported from Florida, a misidentification of C. papyrus (R. R. Haynes and A. Lasseigne 1969).
Open Interactive Map
Click to Display
63 Total Images
Powered by
Symbiota