3788. alopecuroides, L. 



3789. annotinum, L. 



3790. dendroideum, Michx. 



3791. clavatum, L. 



3792. Carolinianum, L. 



3793. complanatum, L. 



var. sabinarfolium, Spg. 



3794. alpinum, L. 

 Selaginella 



3795. •selaginoides, Link. 



3796. rupestris, Spring. 



var. tropica, Spring. 



3797. tortipila, Braun. 



3798. lepidophylla, Spring. 



3799. apus, Spring. 



3800. Douglasii, Spring. 



3801. ? alpidula, Spring. 



3802. Californica, Spring. 

 Tmesipteris 



3803. ? Fosteri, Endl. 



3804. ? truncata, Desv. 

 Psilotum 



3805. triquetrum, Swz. 

 Isoetes 



3806. lacustris, L. 



3807. Tuckermani, Braun. 



56 .i?r 



3808. ochinospora, 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. 

 2815. Nuttallii, Braun. 



3816. Californica, Engelm. 



3817. pygmaja, Englem. 



HYDBOPTEEIDES. 



Marsilia 



3818. quadrifolia, L. 



3819. uncinata, Braun. 



3820. vestita, Hook. & Grev. 



3821. mucronata, Braun. 



3822. tenuifolia, Engelm. 



3823. macropoda, Engelm. 

 Azolla 



3824. Caroliniana, Willd. 



in 



