Resumo

PEREZ CUADRA, Vanesa  e  HERMANN, Paula M.. Anatomic comparison between Nitrophila australis var. australis and Nitrophila occidentalis (Chenopodiaceae). Bol. Soc. Argent. Bot. [online]. 2009, vol.44, n.3-4, pp.329-342. ISSN 1851-2372.

Its taxonomic importance. Nitrophila australis is an endemic halophyte species of Argentina while Nitrophila occidentalis is a native halophyte of North America, both belonging to Polycnemoideae (Chenopodiaceae). They are similar in foliar anatomy: one-layered epidermis, homogeneous chlorenchyma, acqueous tissue and one large central bundle with a variable number of smaller ones on each side of the latter; the main difference stands in the cuticular striae and marginal ribs on each side of the leaf. The stem of both species shows a one-layered epidermis, subepidermic angular collenchyma and a cortical aerenchymatous parenchyma. Four bundles occur in the stele of N. australis while in N. occidentalis there are eight; both show caps of collenchyma associated with each bundle. A superficial phellogen originates in the rhizome of the argentinean species, whereas in the american one it differenciates deep in the cortex. The number of bundles in the rhizome stele of both is variable. Although the general morphological and anatomical characteristics are similar in the species studied, each one has certain specific features, rendering the anatomical study taxonomically valuable at the species level.

Palavras-chave : Nitrophila australis; Nitrophila occidentalis; Vegetative anatomy; Halophytes; Polycnemoideae; Chenopodiaceae; Adaptations.

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