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(Last Modified On 7/29/2013)
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(Last Modified On 7/29/2013)
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Species
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Hygrophila guianensis Nees
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PlaceOfPublication
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London J. Bot. 4: 634. 1845.
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Note
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TYPE: British Guiana, Schomburgk 2nd collection, 331 (291) (not seen).
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Synonym
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Hygrophila conferta Nees in Mart., Fl. Bras. 9: 21. 1847. SYNTYPES: Brazil, Pohl (not seen) and Brazil, Sellow (not seen).
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Description
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Herbs with branching, obtusely quadrangular stems to 1 m tall, glabrous. Leaves lanceolate, of various lengths on the same plant, from 2.5-25 cm long and 0.4-3 cm wide, the cystoliths generally numerous and prominent on the upper epidermis, less numerous beneath, the upper surface glabrous, the lower surface sparingly puberulous, mostly along the veins, apically and basally acumi- nate, entire to undulate. Inflorescence axillary, of clusters of 3 and 4, the flowers sessile. Flowers with the calyx 5-merous, the segments linear and equal, to ca. 8 mm long, white margined, puberulous; corolla white or yellowish white, the tube ca. 6.5 mm long, puberulous, 2-lipped, the upper lip 2-lobed, 3 mm long, the lower lip 3-lobed; stamens 4, didynamous, the filaments of each pair united at the base, the anthers 2-celled and parallel, the cells basally mucronulate. Capsules narrowly oblong, 9-13 mm long; seeds 6-8 per locule.
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Habit
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Herbs
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Distribution
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This species is found along streams and rivers or on the shores of ponds and lakes, often partly submerged and sometimes floating, from Mexico to Central Argentina.
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Specimen
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BOCAS DEL TORO: Santa Catalina, Blackwell et al. 2723 (MO). CANAL ZONE: Near Aguardiente Lagoon, Chagres River, Chavez & Leguia s.n. (DUKE). Barro Colorado Island, Croat 6402 (MO). Chagres River, Dwyer & Robyns 34 (MO), Fairchild 2046, 2105 (both MO). Forest between Peluca Hydrographic Station and Quebrada Peluca along Rio Bo- queron, 70 m, Steyermark & Allen 17228 (MO). COCLE: In stream above El Valle de Anton, D'Arcy & D'Arcy 6726 (MO). Quebrada Amarillo, N of El Valle, Witherspoon 8753 (MO).
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