1) Order isoetales 2) Plant order 
Isoetales, formerly also written Isoëtales, is an order of plants in the class Isoetopsida. There are about 140-150 living species, all classified in the genus Isoetes (quillworts), with a cosmopolitan distribution but often scarce to rare. Living species are mostly aquatic or semi-aquatic in clear ponds and slow-moving streams. Each leaf is slen...
(from the article `Lycophyta`) ...the sole living genus is Selaginella, with nearly 800 species, widely distributed around the world; Selaginellites is an extinct genus.Order ...
[n] - aquatic or marsh-growing fern allies