Common name: Arrowhead
Sagittaria montevidensis Cham. & Schltdl. APNI*
Description: Emergent caespitose aquatic perennial to 1 m high, with submerged, floating, but mainly emergent leaves; either a fibrous-rooted annual, or a perennial with a short thick rhizome.
Emergent leaves prominently veined, strongly sagittate (floating leaves sagittate or not), to 25 cm long and 20 cm wide, with the lobes to 15 cm long and 10 cm wide.
Flowers c. 2.5 cm diam. Sepals 3–8 mm long. Petals about twice as long as sepals, white or white with purple base. Stamens 12-numerous, filaments linear and sparsely pubescent. Female flowers with or without a ring of functional stamens; carpels numerous.
Flowering: Flowers during warmer months.
Distribution and occurrence: Widely cultivated; naturalized in permanent freshwater to c. 1 m deep. Native of Amer.
NSW subdivisions: *CWS, *ST, *SWP
Declared Noxious Weed
Text by S. W. L. Jacobs
Taxon concept: Flora of NSW 4 (1993)
| ||Key to the subspecies|| |
|1||Female flowers without a ring of functional stamens; petals white with a purple base||subsp. montevidensis|
|Female flowers with a ring of functional stamens; petals white||subsp. calycina|
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