54 



3797. tortipila, Braun. 



3798. lepidophylla, Spring. 



3799. apus, Spring. 



3800. Douglasii, Spring. 



3801. ? albidula, Spring. 

 Jf802. Californlca, Spring. 



Tmesipteris 



3803. ? Fosteri, Endl. 



3804. ? truncata, Desv. 

 Fsilotum 



3805. triquetrum, Swz. 

 Isoetes 



3806. lacustris, L. 



3807. Tucliermani, Braun. 

 3608. echinospora, Durieu. 



var. Braunii. 

 var. muricata. 

 var. Boottii. 



3809. saccharata, Engelm.. 



3810. riparia, Engelm. 



3811. Engelmanni, Braun. 



var. gracilis, 

 var. valida. 



3812. melanopoda, J. Gay. 



3813. flaccida, Shuttlew. 



3814. Chapmani, Engelm. 



3815. Nuttallii, Braun. 



3816. Californica, Engelm.. 



3817. pygmsea, Engelm. 



HYDROPTERIDES. 



Marsilia 

 38-18. quadrifolia, L. 



3819. uncinata, Braan. 



3820. vestita, Hool;. & Grcv. 



3821. mucronata, Braun. 



3822. tenuifolia, Engelm. 



3823. macropoda, Engelm. 

 Azolla 



3824. Car-oliniana, Wllldi^ 



