Tropicos | Name - Alternanthera philoxeroides (Mart.) Griseb.

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Alternanthera philoxeroides (Mart.) Griseb.

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Flora Data (Last Modified On 1/28/2013)

Species	ALTIERNANTHERA PHMLOXEROIDES (Mart.) Griseb.
PlaceOfPublication	Abh. Ges. Wiss. Gott. 24: 36. 1879.
Synonym	Bucholzia philoxeroides Mart. Nova Acta Acad. Leop.-Carol. 131:3 15. 1826. Telanthera philoxeroides Moq. in DC. Prodr. 13 2:3 62. 1849. Telanthera philoxeroides a obtusifolia Moq. loc. cit. 363. 1849. Telanthera philoxeroides , acutifolia Moq. loc. cit. 363. 1849. Telanthera philoxeroides var. 8 phyllantba Seub. in Mart. Fl. Bras. 51;169. 1875. Telanthera philoxeroides var. y denticulata Seub. loc. cit. 170. 1875. Achyranthes philoxeroides (Mart.) Standl. in Jour. Wash. Acad. Sci. 5:74. 1915.
Description	Decumbent or ascending glabrate aquatic perennials, the simple or branched, often fistulose stems to 100 cm. long. Leaves glabrous or glabrate, lanceolate to narrowly obovate, apically rounded to acute, basally cuneate, rarely denticulate, 2-10 cm. long, 0.5-2 cm. broad; petioles 1-3 mm. long. Inflorescences of terminal and occasionally axillary white glomes, 10-18 mm. long, 10-18 mm. broad, the usually unbranched peduncles 1-5 cm. long. Flowers perfect, bracts and bracteoles subequal, ovate, acuminate, 1-2 mm. long; sepals 5, subequal, oblong, apically acute and occasionally denticulate, neither indurate nor ribbed, 5-6 mm. long, 1.5-2.5 mm. broad; stamens 5, united below into a tube, the pseudostaminodia lacerate and exceeding the anthers; ovary reniform, the style about twice as long as the globose capitate stigma. Fruit an indehiscent reniform utricle 1 mm. long, 1-1.5 mm. broad; mature seeds not seen.
Reference	Standley (in N. Am. Fl. 21:142. 1917)
Distribution	the range of this species as from Colombia to Brazil and Argentina, adventive in the southeastern United States.
Note	I have seen no specimens from Panama but it could easily be adventive there. Suessenguth (in Rep. Spec. Nov. 39:4. 1935) reports a teratological specimen from Pearl Islands in San Jose in which the stamens are replaced by carpels.

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