GENERA AND SPECIES. 199 
tr. Lodicules united. Stigmatic plumes branched; 
flowering glumes rounded on the back. 
Semiaquatic, floating or creeping; panicle narrow, long 
and loose ; flowering glumes glabrous, 7-nerved ... fluitans 
Erect or diffuse branchless stems. 
Flowering pene pane hited, 7- to 9-nerved ; 
panicle - loose . x ai Bo av ... Fordeana 
Flowering isa setenie 5-nerved ; panicle 
narrow, dense my ue vee ty ... syrtica 
Very tall, branched stems; panicle very spreading ; 
flowering glumes broad, concave, hyaline, 3-nerved ramigera 
CLASS III.—VASCULAR ACOTYLEDONS. 
ORDER LYCOPODIACEAE. 
Spore-cases and spores all similar. Comparatively large Lyeopodium 
Spore-cases and spores of two kinds. Small erect plants Selaginella 
Lycopodium. 
Stems creeping ; spikes single on lateral erect peduncles Carolinianum 
Stems erect, branched at the base ; spikes sessile, lateral /aterale 
Stems much branched, erect ; spikes sessile, terminal ... densum 
Selaginella. 
Stems from a branching base, simple, about 1 inch ... Preissiana 
Stems branching upwards, several inches long _... ... Uliginosa 
ORDER RHIZOSPERMAE. 
Floating minute plants, much branched, reddish; leaves 
crowded ;_ fruit-masses _ sessile, SHON, transparent, 
globular .. ate i .. Azolla 
Fronds erect, Realized, divided io 4 Reemicnte spore-cases 
hard, compressed, basal. Semiaquatic ; creeping .. Marsilea 
Fronds linear, erect; spore-cases globular, basal, sessile. 
Semiaquatic with creeping rhizome ... a ss .. Pilularia 
Azolla. 
Stems once or twice pinnate, broadly ovate in outline, with 
linear leafy branches, the segments slightly distant; roots 
feathery .. ve ; . pinnata 
Segments of fies stems eae iter Sincaks selaeaien ; Poets 
simple... dy ae ae bs iis Hi .. filiculoides 
