.EROGENOUS PLANT S. 



G21 



St. Peter's. Panicum pauciflorum, (Ell.) Panicum virgatum, (L. ) Cenchrus cchiuatus, (L.) Bun- 

 grass. Sandy soil. Iowa. Andropogon furcatus, (Muhl.) Dry prairies. Common. Sorghum 

 nutans, (Gray.) Dry soil. Iowa and Minnesota. 



iEROGENS. 



Equisetace^e. — Equisctum arvense, (L.) April. Damp places. Common. Equisetum sylvaticum, 

 (L.) May. St. Peter's. Equisctum limosum, (L.) Shallow water. St. Peter's and St. Croix. Equi- 

 setum hyemale, (L.) Scouring rush. Very abundant, and rank, on the wooded banks of the St. Peter's, 

 above high-water mark. Equisetum varicgatum, (Schleicher.) Margins of Montreal River, Lake Supe- 

 rior. Equisetum scirpoides, (Michx.) Deep woods. St. Croix. 



Filices. — Polypodium vulgare, (L.) Crevices of exposed rocks of every character. St. Peter's and 

 St. Croix. Polypodium Phegopteris, (L.) Damp woods. St. Croix. Polypodium Dryopterus, (L. ) 

 Damp woods, under the shade of evergreens. St. Croix and Lake Superior. Struthiopteris Gcrmanica, 

 (Willd.) Alluvial soil, exceedingly rank on the bottoms of the Lower St. Peter's. Allosorus gracilis, 

 (Presl.) Shaded rocks, Davenport, Iowa, Blue Earth River, head of Lake St. Croix. Pteris Aquilina, 

 (L.) Common brake. Dry soil. Pteris atropurpurea, (L.) Attached principally to the Magnesian 

 Limestones, Upper and Lower. Adiantum pedatum, (L.) Maiden-hair. Common. Camptosorus rhi- 

 zophyllus, (Link.) Walking fern. Shaded and detached rocks, Falls of St. Croix. This fern sends forth 

 roots at the extremity of each prolonged leaf, producing a bunch similar to the parent root, whence its 

 name of walking-fern. Asplenium thelypteroides, (Michx.) Shady woods* St. Croix. Asplenimn 

 Filix-foemina, (R. Br.) Moist woods. Common. Cystopteris bulbifera, (Bernh.) Wet rocks. Blue 

 Earth River. Cystopteris fragilis, (Bern.) Shaded cliffs, St. Peter's and St. Croix. Woodsia obtusa, 

 (Torr.) Trap-rocks. Falls of St. Croix. Woodsia Uvensis, (R. Br.) Exposed granite and quartzitc 

 rocks. Upper St. Peter's. Cheilanthes vestita, (Willd.) Rocks. Falls of St. Croix. Dryopteris Thelyp- 

 teris, (Gray.) Moist thickets. St. Croix. Dryopteris dilatata, (Gray.) Ravines. Falls of St. Croix. 

 Dryopteris cristata, (Gray.) Alder swamps. St. Croix. Aspidium fragrans, (Sw.) Trap-rocks. Falls 

 of St. Croix. Frond bipinnate, oblong-lanccolate ; pinna? oblong, slightly tapering to a very obtuse point, 

 regularly opposite and alternate, closely set on the stipe ; pinules oblong, obtuse, round-toothed. Sori 

 attached in two rows, corresponding to the lobes formed by the teeth, nearer the midrib than margins of 

 the pinnae, mostly covering the lower surface of the frond ; stipe thickly clothed at its lower part with 

 brownish, unequal, ovate-acuminate scales. The whole fern beset with fragrant, glandular hairs. Grow- 

 ing in dense tufts, in the shaded crevices of trap-rocks, with the withered remains of several years' growth 

 still adhering. The fronds are of a deep green colour above, paler below, four to nine inches high. The 

 aroma is permanent and agreeable. I am informed by Dr. Torrey that this species has never before 

 been found within the limits of the United States, but has been obtained in British America and Kam- 

 schatka, where it is used for making tea. In the locality here specified, it is quite abundant. Polysti- 

 chum acrostichoides, (Schott.) Shady river-banks. Davenport, Iowa, and Fort Snclling. Onoclea 

 sensibilis, (L.) Moist, springy places. Common. Osmunda spectabilis, (Willd.) Swamps. Upper 

 St. Croix. Osmunda Claytoniana, (L.) Rich hillsides. St. Croix. Botrychium lunarioides, (Sw.) 

 Low grounds. St. Croix. Botrychium Virginicum, (Sw.) Pueh woods. St. Peter's. 



LycopodiacevE. — Lycopodium lucidulum, (Michx.) Deep woods. St. Croix. Lycopodium annotinum, 

 (L.) Woods. Lake Superior. Lycopodium clavatum, (L.) Upper St. Croix. Lycopodium dendroi- 

 deum, (Michx.) Upper St. Croix. Lycopodium complanatum, (L.) Pine barrens. St. Croix. Sela- 

 ginella rupestris, (Spring.) Exposed granite rocks, Upper St. Peter's; trap rocks, Falls of St. Croix. 



MUSCI.* — Sphagnum cymbifolium, (Ehrh.) Cranberry marshes. Dicranum scoparium, (Hedw.) 

 Lake Superior. Leucobryum vulgare, (Hampe.) Trap rocks. St. Croix. Atrichum angustatum, 

 (Beauv.) Lake Superior. Bartramia poiniformis, (Hedw.) Montreal River. Mnium punctatum, 

 (Hedw.) Cedar swamps. St. Croix. Mnium affine, (Blandon.) Decaying logs. Lake Superior. 

 Bryum roseum, (Schreb.) Lake Superior. Isotherum minus, (Beauv. ) Adhering to the trunk of the 

 Swamp Ash. Hypnum populeum, (Hedw.) Red sand-rock. Lake Superior. Hypnum Schreberi, 



* Determined by William S. Sullivant, of Columbus, Ohio. 



