Neotropical Flora
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Pistia stratiotes L.  
Family: Araceae
Pistia stratiotes image
Carmen Galdames
  • Flora of Barro Colorado Island
  • Resources
The Flora of Barro Colorado Island by Thomas Croat
Floating aquatic, nearly acaulescent; caudex sometimes producing stolons with new rosettes of leaves at apex. Leaves forming dense rosette; petioles very short; blades +/- obovate, rounded or emarginate at apex, cuneate at base, mostly 5-17 cm long, 2-7 cm wide, thick and spongy, pubescent on both surfaces with short, few-celled trichomes; veins in 5-15 pairs, parallel, prominent beneath. Inflorescences small and inconspicuous, subsessile, borne among leaves; spathe white, constricted at middle, the lateral margins connate to middle; spadix shorter than spathe and adnate to it for two-thirds of its length, with a single naked pistillate flower and 2-8 naked staminate flowers arranged in verticils; stamens 2, connate to form a synandrium; ovary obliquely attached to spadix, 1-celled; ovules numerous with basal placentation. Seeds cylindrical, minute. Croat 8431. Occasional, at the lake margin, usually in quiet waters. Flowering period unknown.
Pistia stratiotes
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Carmen Galdames
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Carmen Galdames
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