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Project Name Data (Last Modified On 11/1/2012)
 

Flora Data (Last Modified On 11/1/2012)
Species EICHHORNIA CRASSIPES (Mart.) Solms
PlaceOfPublication DC. Monogr. 4::527. 1883.
Synonym Pontederia crassipes Mart. Nov. Gen. 1:9. 1824. Pontederia azurea Hook. Bot. Mag. p1. 2932. 1829, excl. syn., not P. azurea Sw. Piaropus crassipes (Mart.) Raf. Fl. Tell. 2:81. 1837. Piaropus mesamelas Raf. loc. cit. 1837. Piaropus tricolor Raf. loc. cit. 1837. Eichhornia speciosa Kunth, Enum. P1. 4:131. 1843. Heteranthera forimosa Miq. Linnaea 17:61. 1843. Pontederia elongata Balf. Proc. Bot. Soc. Edinb. 1855:50. 1855. Eichhornia crassicaulis Schlecht. Abh. Nat. Ges. Halle 6:177. 1862. Pontederia crassicaulis Schlecht. loc. cit. 1862. Piaropus crassipes (Mart.) Britton, Ann. N. Y. Acad. 7:241. 1893. Eichhornia cordifolia Gandog. Bull. Soc. Bot. Fr. 66:294. 1920.
Description Floating plants with short, condensed stems and many long, pendant, plumose roots inserted at the stem base; new plants arising through branching and often remaining attached to the parent plant for considerable lengths of time. Leaves with expanded orbicular blades up to 8 cm. broad, and stipulate petioles 2-30 cm. long, petioles excessively inflated in short-petioled leaves, scarcely inflated in very long-petioled leaves. Inflorescence 4-15 cm. long, lightly pubescent with gland- tipped hairs, 4- to 14-flowered. Spathe sub-ensheathing the showy spicate inflores- cence. Flowers lavender, 4-6 cm. long, upper petal with a darker purple-blue blotch bearing a yellow spot in the center; tube narrow, about 1.6 cm. long; sepals slightly narrower than the petals; stamens unequal, the 3 longer well ex- serted, the 3 shorter scarcely extending beyond the tube; filaments glandular- pubescent, adnate to the tube, those of the longer stamens about 2 cm. long, those of the shorter about 0.5 cm. long; anthers linear-oblong, 2-lobed, versatile, about 2.5 mm. long; style elongate with a mop-like capitate stigma. Ovary 3-carpellary, many-ovulate. Seeds 1.2 mm. long, 0.5-0.6 mm. wide.
Distribution United States to Paraguay and the Antilles. Naturalized throughout the tropics of the world.
Note The Water Hyacinth multiplies to such an extent that it frequently chokes waterways and becomes a menace to navigation.
Specimen BOCAS DEL TORO: vicinity of Chiriqui Lagoon, von Wedel 4I5. CANAL ZONE: Gatuin Lake, Allen 1965. CHIRIQUi: swamp, Boquete, alt. 3800 ft., Davidson 6I3; Woodson d ScherY 743.
 
 
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