Najadaceae


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Najadaceae

[‚nāj·ə′dās·ē‚ē]
(botany)
A family of monocotyledonous, submerged aquatic plants in the order Najadales distinguished by branching stems and opposite or whorled leaves.

Najadaceae

 

a family of monocotyledonous plants; it includes the single species Najas. The diclinous, small, inconspicuous flowers are solitary or, less frequently, in groups of two or four; they are borne on an extremely reduced axial shoot and are usually enclosed in a small membranous spathe. In pistillate flowers the spathe is often absent or sometimes fused to the ovary. The staminate flowers have one stamen, which is equipped with an almost sessile anther; the pistillate flowers have two to four stigmal branches. The Najadaceae are either monoecious or dioecious; blossoming and fertilization occur underwater. The fruit is indehiscent and monospermous.

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Thomas 1518 Najas guadalupensis Najadaceae Clark W.E.
Familia Generos Especies Especies Categorias endemicas infraespecificas Alismataceae 2 18 3 2 Amaryllidaceae 2 5 1 Araceae 2 2 - Bromeliaceae 1 1 - Cannaceae 1 1 - Commelinaceae 5 7 2 Cymodoceaceae 2 3 - Cyperaceae 18 125 21 5 Eriocaulaceae 4 16 6 Hydrocharitaceae 6 7 - 1 Iridaceae 3 15 6 Juncaceae 1 18 1 1 Juncaginaceae 2 2 - Lemnaceae 4 15 - Limnocharitaceae 2 9 - Marantaceae 1 1 - Mayacaceae 1 1 - Najadaceae 1 3 - 1 Orchidaceae 9 15 3 Poaceae 26 75 10 Pontederiaceae 3 15 - Potamogetonaceae 2 10 - Ruppiaceae 1 2 - Sparganiaceae 1 2 - Typhaceae 1 2 - Xyridaceae 1 7 - 1 Zannichelliaceae 1 1 - Zosteraceae 1 3 - Total 104 381 53 11 Cuadro 2.
Notable is the fact that the submersed aquatics in the order (Aponogetonaceae, Hydrocharitaceae, Najadaceae, Ruppiaceae, Zannichelliaceae, Zosteraceae) lack vessels throughout the plant.
A HLF Najadaceae (a) ** Najas guadalupensis (Spreng.) Magnus A HES Poaceae Echinochloa crus-pavonis (Kunth) Schult.