_ ■ 



Hill: Notes on Plants of the Chicago District 305 ^ 



cupy in mass different areas whose borders overlap, P. scirpoidcs 



I 



more abundant, taller and stouter. It is interesting to note also 

 that the spikelets are often much changed in appearance by a rust, 

 probably the same which Torrey. mentions in the original descrip- 

 tion of P, scirpoidcs in his '* Monograph of North American Cy- 

 peraceae.'"'' ** The flowers are frequently affected with a species of 



I 



Urcdo^ insomuch that during one season Mr. Green [of New Bed- 

 ford, Mass., who seems to have sent Torrey the first specimens of 



I 



the plant] was unable to find a single specimen that was not 

 diseased." 



Fiuroia sqitan'osa Michx. nearly ranks with this group, having 

 one locality north of Detroit, Mich., accorded it, and occurring 

 also in northern Ohio. West it appears again in Nebraska. Last 



I 



summer it was found in a single locality in the dune region. 



■ These plants generally grow in proximity in the same sloughs, 

 being plants of wet ground, with the exception of Panicum lanu- 

 ginosiiui which frequents the slopes of neighboring sand hills and 



! 



comes down to the sloughs at their base. It occurs also in localr 

 ities outside of the dunes proper. They have been obtained near 



I 



Dune Park, Porter County, Ind., all but Scleria Torrcyana in a 

 section of the dune area I had not visited until 1897, and am not 

 aware of its having been explored by others previously.' , 



' * I 



Some plants from the same section which have had an east- 



>.i I' ^% 



ward or a southern range assigned them can be added to the list, 

 Elcocharis Robbinsii Oakes, not given farther west than Clinton 

 County in Central ^Michigan, the only known locality in the State 

 (Beal and Wheeler's Michigan Flora, 1 892); Scleria rcticidaris 

 Michx. and S, paiiciflora Muhl., south of this along our meridian. 

 By finding the last the past season there are given to the dune re- 



r I 



gion five of the six species of Scleria within the range of the Man- 

 iml region, S. trigloiiicrata and S, verdcillata being known from 

 here before and quite general in their occurrence. They can all 



I 



be obtained in a limited area at Dune Park, together with the plants 

 heretofore mentioned, and within a circle of scarcely more than a 



I' 



mile radius. To this group may be added PaniciiDi sphaerocarpon 

 Ell., a plant of dry sand hills ; Lininn striatum Walt., in open wet 



I 



or wettish ground, both from Dune Park ; Cassia nictitans L. from 



*Ann. I.yc. X. V. 3: 361. 1836. 



