42 



2706. flexilis, Rostk. 



var. fusiformis, Chapm. 



2707. Indica, var. gracillima, 



Braun. 

 Zannichellia 



2708. palustris, L. 

 Zostera 



2709. marina, L. 

 Ruppia 



2710. maritima, L. 

 Fotamogetou 



2711. amplifolius, Tuck. 

 -2712. Claytonii, Tuck. 



2713. compressus, L. 



2714. crispus, L. 



2715. gramineus, L. 



var. ? spathulasformis, 



Robbins. 

 var. ? myriophyllus, R. 



2716. hybridus, Michx. 



2717. lonchites, Tuck. 



2718. lucens, L. 



var. minor, Nolte. 

 var. ? Connecticutensis, 

 Eobbins. 

 — 2719. natans, L. 



2720. Niagarensis, Tuck. 



2721. Oakesianus, Bobbins. 



2722. obtusifolius, Mertens & 



Koch. 



2723. pauciflorus, Pursh. 



2724. pectinatus, L. 



2725. perfoliatus, L. 



var. lanceolatus, Eob- 

 bins. 



2726. praelongus, Wolfen. 



2727. pulcher, Tuck. 



2728. pusillus, L. 



var. major, Fries, 

 var. vulgaris, Fries, 

 var. tenuissimus, Mert. 



& Koch, 

 var. ? gemmiparus, Rob. 



2729. Robbinsii, Oakes. 



2730. rufescens, Schrad. 



2731. Spirillus, Tuck. 

 2732^ Tuckermanii, Robbins. 



2733. Vaseyi, Robbins. , 



ALISMACE^J. 



Triglochin 



2734. palustre, L. 



2735. maritimum, L. 



2736. triandrum, Michx. 



Scheuchzoria 



2737. palustris, L. 

 Alisma 

 y — 2738. Plantago, L., var. Ameri- 

 canum, Gr. 

 Echinodorus • 



2739. parvulus, Engelm. 



2740. rostratus, Engelm. 



2741. radicans, Engelm. 

 Sagittaria 



2742. lancifolia, L. 



>€ ~ 2743. variabilis, Engelm. 



2744. calycina, Engelm. 



2745. heterophylla, Pursh. 



2746. graminea. Michx 



2747. natans, Michx. 



var. lorata, Chapm. 



2748. pusilla, Nutt. 



HYDROCHARIDACE-ffi. 



Limnobium 

 J ' 2749. Spongia, Richard. 



Anacharis 

 1 ~ 2750. Canadensis, Planchon. 



Vallisneria 

 12, 2751. spiralis, L. 



BURMANNIACEiE. 



Burmannia 



2752. biflora, L. 



2753. capitata, Chapm. 

 Apteria 



2754. setacea, Nutt. 



ORCHIDACEiE. 



Orchis 



2755. speetabilis, L. 

 Habenaria 



2756. blephariglottis, Hook. 



2757. ciliaris, E. Br. 



2758. cristata, R Br. 

 \0 - 2759. dilatata, Gray. , 

 ,t,~ 2760. fimbriata, R. Br.iV 



jf-2761. Hookeri, Torr. 

 f, ~ 2762. hyperborea, R. Br. 



2763. integra, Spreng. 



2764. lacera, R Br. 



2765. leucophaea, Gray. 



2766. Michauxii, Nutt. 



2767. nivea, Spreng. 



2768. obtusata, Richardson. 



2769. orbiculata, Torr. 



2770. peramoena, Gray. 

 i-t -2771. psychodes, Gray. 



