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16. Salviniaceae

槐叶苹科 huai ye ping ke

Authors: Youxing Lin, Shi Lei, Michele Funston & Michael G. Gilbert

Plants aquatic, forming floating mats; roots present (Azolla) or lacking (Salvinia); stems horizontal, protostelic, vegetative reproduction rapid due to fragmentation. Fronds with exposed upper surface covered with water-repellent papillae, fronds in whorls of 3: two fronds floating, green, lamina orbicular to oblong, small (8-25 mm), third one submersed, finely dissected and rootlike (Salvinia), or fronds alternate, distichous, minute (ca. 1 mm), 2-lobed: one lobe floating, with a cavity near base containing blue-green algae (Anabaena), other lobe submersed, only 1 cell thick (Azolla). Sporangia contained within sporocarps, these inserted on submersed frond and externally uniform (Salvinia) or in pairs with a globose microsporocarp and a smaller ovoid megasporocarp (Azolla); spores of two kinds (plants heterosporous), microspores globose, trilete, megaspores large, spore germination endosporic.

Two genera and ca. 17 species: tropical to temperate regions worldwide; two genera and four species (one introduced) in China.

Lin Youxing. 2000. Salviniaceae and Azollaceae. In: Lin Youxing, ed., Fl. Reipubl. Popularis Sin. 6(2): 340-345.

1 Fronds in whorls of 3, two floating, green, 8-25 mm, with midrib, third one finely dissected, submersed, rootlike; true root absent; sporocarps in clusters or chains of 6 or more, externally all similar.   1 Salvinia
+ Fronds alternate, usually overlapping, ca. 1 mm, divided with a floating upper lobe and submersed lower lobe; root present; sporocarps in pairs, each usually with a small megasporocarp and a larger microsporophyte.   2 Azolla

Lower Taxa


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