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Nasturtium gambelii

Nasturtium gambelii (S. Watson) O.E. Schulz   (redirected from: Nasturtium gambellii (S. Watson) O.E. Schulz)
Family: Brassicaceae
Gambel's Watercress
[Nasturtium gambellii (S. Watson) O.E. Schulz]
Nasturtium gambelii image
  • FNA
  • Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
Plants sparsely to moderately pubescent. Stems 5-12 dm. Cauline leaves: petiole narrowly winged, base auriculate or not; blade 9-17-foliolate, 3-10 cm; lateral leaflets sessile, rachis narrowly winged, blade about same size as terminal; terminal leaflet blade linear to narrowly oblong or lanceolate, 0.5-2.5 cm × 2-8(-10) mm, base decurrent with adjacent pair of leaflets, margins often dentate, rarely sinuate-repand, apex acute. Fruiting pedicels divaricate or descending, straight, 9-25 mm. Flowers: sepals 3-4 × 1-1.5 mm; petals white, spatulate or oblanceolate, 6-8 × 2-2.5 mm, (base to 2 mm), apex obtuse to acute; filaments 5-7 mm; anthers 1-1.2 mm. Fruits 2-3 cm × 1-1.2 mm; ovules 24-40 per ovary; style 1-2.5 mm. Seeds uniseriate, reddish brown, ovate, 1-1.2 × 0.6-0.8 mm, minutely reticulate with 300-450 areolae on each side.

Flowering May-Aug. Lake margins, streams, swamps, marshes, ponds; of conservation concern; 5-30 m; Calif.; Mexico (Chiapas, Federal District); Central America (Guatemala).

Nasturtium gambelii is known from southern California in Los Angeles, San Bernardino, San Luis Obispo, Santa Barbara, and Ventura counties. It is likely to be found also in undisturbed, freshwater habitats elsewhere in southern California and in Mexico and Central America. Intermediates between N. gambelii and N. officinale have been found in southern California, suggesting hybridization between them. Experimental work is needed to confirm this hypothesis.

Nasturtium gambelii
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].

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