256 The American Naturalist. [March, 



dentalis, Polygonum dumetorum var. scandens, Phryma leptostachya, 

 Distichlis maritima. Lemno minor, L. polyrrhiza, Mimulus jomesii, 

 Spartina cynosuroides and gracilis, with other species common to prairie 

 and timbered regions. Many of the species found at these springs 

 were found no nearer than the Black Hills or the Missouri River, yet 

 here they seemed to nourish in the very centre of the great Bad Land 



I append a list of a few of the more characteristic species of each of 

 the three regions. 



The Range. — Stipa comata, Boutelua hirsuta, Boutelua oligo- 

 staehya and B. racemosa, Agropyrum glaucum, A. repens, Yucca nricpisti- 

 folia, Sophora sericea, Shrankia uneinata, Psoralea argophylla, ten- 

 uiflora, cuspidata and esculenta, Astragalus caryocarpus and fiexuosus ; 

 Gutierrezia euthamice, Solidago missouriensis, canadensis ami scroti na; 

 Helianthus petiolaris, Marsilia vest it a. 



The Black Hills. — Onoclea struth'mpb-ri.-, Jan i pern.-- communis 

 and virginiana; Picea alba, Pinus ponderosa var. scopulorum, Behda 

 aotwt, Ottrya nryimro, 

 Corylus rostrata and americana ; Pyrola chlorantha and secunda ; rter- 

 ospora andromeda, Androsace septentrional is, Hedeoma drummondu, 

 Lophanthus ..herdia cana- 



densis, Euphorbia dictyosperma, Sambucus canadensis and racemosa; 

 Aralia nudicaulis, Aetata rubra and alba; Disporum trachycarpwm, 

 Geranium richardsonii, carolinianum and dissectum ; Mentzeha ohgo- 

 sperma, Quercus macrocarpa. 



The Bad Lands.— Spartina gracilis, Sporobolus airoides, Sporobo- 

 lus asperifolius, Androp la didymocarpa, Astraga- 



lus sericoleucus, Astragalus caespitosus, Astragalus gracilis, Astragalus 

 p t (E otl?racaespitosa,Sarcobatusvermiculatus,Atriplc.riiott<!/hi, 

 Parmelia molliuscula, Urceolaria scruposa var. gypsacea, Ulceolaria 

 scruposa, var. parasitica, Tylostoma mammosum, Geaster delicatus.— 

 T. A. Wiii.ni> 1 -- 



