2) Petalostemum candidum Michx., white prairie clover. 



i) Lathyrus palustris L., marsh-pea. 



2) Desmodium illinoense Gray, tick-trefoil. 



i) Poly gala sanguinea L., milkwort. 



i) Hypericum virgatum Lam., St. John's-wort. 



i) " muHlum L., St. John's-wort. 



i) Viola papilionacea Pursh, violet. 



2) " sagittata Ait., sagittate violet. 



i) " pedatifida G. Don., prairie violet. 



i) Lythrum alatum Pursh, winged loosestrife. 



i) Oenothera pratensis Robinson, sun-drops. 



2) Gaura biennis L. 



2) Zizia aurea Koch., golden Alexanders. 



2) Eryngium yuccifolium Michx., button snakeroot. 



i) Cicuta maculata L., water-hemlock. 



i) Oxypolis rigidior (L.) Coult. & Rose., cowbane. 



2) Dodecatheon Meadia L., shooting-star. 



2) Lithospermum canescens Lehm., puccoon. 



2) Satureja glabra Fernald, calamint. 



i) Steironema quadriflorum Hitch., loosestrife. 



i) " lanceolatum Gray, loosestrife. 



2) Gentiana puberula Michx., gentian. 



2) " flavida Gray, gentian. 



2) Apocynum cannabium L., Indian hemp. 



i) Asclepias incarnata L., swamp milkweed. 



i) " Sullivantii Englem., SuUivant's milkweed. 



2) " verticillata L., verticillate milkweed. 



2) Acerates floridana Hitch., green milkweed. 



i) Convolvulus sepium L., hedge bindweed. 



2) Phlox glaberrima L., smooth phlox. 



2) * ^iVo^a L., hairy phlox. 



2) Cynoglossum officinale L., hound's- tongue. 



2) Verbena siricta Vent., hoary vervain. 



2) Scutellaria parvula Michx., small skullcap. 



2) Physostegia virginiana Benth., dragon-head. 



i) Stachys palustris L., woundwort. 



2) Pycnanthemum virginianum L., mountain mint. 



2) " flexuosum BSP., mountain mint. 



i) Lycopus americanus Muhl., water horehound. 



2) Chelone glabra h., snake's-head. 



2) Veronica virginica L., Culver's root. 



2) Gerardia purpurea L. 



2) " tenuifolia Vahl. 



i) Pentstemon laevigatus Ait., beard- tongue. 



i) Mimulus ringens L., monkey flower. 



2) Galium boreale L., northern bedstraw. 



i) " tinctorium L., bedstraw. 



i) Campanula aparinoides Pursh, marsh bellflower. 



2) Lobelia spicata Lam., wild lobelia. 



'14 



