Sagittaria guayanensis

Kunth in A. von Humboldt et al.

in A. von Humboldt et al.,Nov. Gen. Sp. 1: 250. 1816.

Introduced
Treatment appears in FNA Volume 22.

Distribution

Introduced; La., North America, Mexico, West Indies, tropical regions, Asia, Africa

Discussion

The name has often been spelled guyanensis (K. Rataj 1972), which is incorrect. Sagittaria guayanensis was the spelling in the protologue. The holotype was collected by Humboldt and Bonpland in Colombia, not Guyana. The type citation is Colombia: Guainia: in wetlands near the sugar mill of Don Felix Farreras and the city of Bolivar. The type is supposedly at Paris, as with all HBK types; however, we (with the help of Alicia Lourteig) have been unable to locate it. MO has a fragment, however. Rataj did designate a neotype: Suriname, Hostman 870 (TCD!). The fragment at MO takes precedence over this neotype.

Sagittaria guayanensis was divided into two subspecies, S. guayanensis subsp. guayanensis from the Neotropics and subsp. lappula (D. Don) Bogin from the Paleotropics. The two subspecies were separated by the shape and size of the fruit in addition to their distribution. Sagittaria guayanensis subsp. lappula has compressed achenes longer than 2.5 mm, whereas subsp. guayanensis has plump achenes shorter than 2.5 mm (C. Bogin 1955).

Subspecies 2 (1 in the flora).

... more about "Sagittaria guayanensis"
papillose +  and smooth +
Obtuse (?) +  and Acute (?) +
Robert R. Haynes +  and C. Barre Hellquist +
Kunth in A. von Humboldt et al. +
attenuate;hastate or sagittate +
linear +  and obovate +
lanceolate +
La. +, North America +, Mexico +, West Indies +, tropical regions +, Asia +  and Africa +
u--shaped +
glabrous +  and pubescent +
linear +  and dilated +
pistillate +, staminate +, sessile +  and pedicellate +
hypogynous +
not +, keeled +  and compressed +
decumbent +  and floating +
petiolate +  and sessile +
decumbent +  and floating +
submersed +, floating +  and emersed +
ascending +  and recurved +
deciduous +
terete +  and triangular +
not radiating +  and arranged +
in A. von Humboldt et al.,Nov. Gen. Sp. +
decumbent +  and floating +
thieret1969b +
persistent +
recurved;erect +
sculptured +
herbaceous;leathery +
Introduced +
Lophotocarpus +
Sagittaria guayanensis +
Sagittaria +
species +
white;brown +
annual +  and perennial +
emersed +  and submersed +
glabrous +  and sparsely pubescent +
bracteolate +  and branching +