62 The American Naturalist. [Juunoft 



many specimens were found where both of the so-called varieties of this 

 species grew on one stem, one part of which grew on the bank and the 

 other in the water. I thought I had made a great find but as I learned 

 later this little plant is very common from the Buttes to the Black 

 Hills, hardly a pond being free from it. 



On the summits of the Buttes we found Dalea aurea in considerable 

 quantity but nowhere else did it occur. 



At Peno Hills, about 70 miles East of the Black Hills we found 

 many old friends and many new ones. Along the stream which riwi 

 in these hills were good sized trees of elm, boxelder, ash, ( [Fro. i inns 

 nitidis and F. pubescens), hackberry, willow and the like. Here we 

 also found Amelanchier alnifolia, Crataegus coccinea, I'ruuus vinjininnu 

 P. americana and P. pumila. The fruit of both of the cherries was very 

 fine, while some small bushes of sand-cherry were found bearing fruit 

 as large and luscious as that of the ordinary cultivated cherries. On 

 the North slope of one of the hills Juniperus sabina var proeumbens 

 formed dense mats, especially along tie small draws that lead down 

 from the hillside. The only willows collected in this region were 

 Salix longifolia and 8. eordata var. vestita though I am certain that S. 

 amygdaloides will be found also. 



There are quite a number of small streams between Pierre and the 

 Cheyenne River that would be as well wooded as is this stream at 

 Peno Hills if they could be protected from prairie fires. We saw main- 

 fine groves of elm, ash, boxelder and cottonwood that had been killed 

 by fires after the trees had grown to be two and three feet in diameter- 

 The groves at Peno Hills are protected from the fires by means of the 

 line of dry barren hills along the North and West and have become 

 the pride of the whole region. 



At the Cheyenne River we found some interesting things ; coming 

 down from the high uplands 'to the so-called second bottom we found 

 Psoralea tenuiflora in abundance, for the first time. It reaches its 

 finest development here, being much larger than I have ever seen it 

 elsewhere. On the bluffs that border the narrow vallev grew Ipomoea 

 leptophylla, several Oenotheras, Mentzcth onmtu M. nnd-t, Mnsenium 

 teninjolium, Stankm plnunhi and Lu/titm* r >i,<'>(hi.< ('almost always 

 accompanied by a fungus, probablv a i'lmiin which wa« very injurious 

 to it.) 



Along the canons near Smith ville the silvery form of the red cedar 

 was quite abundant, offering a marked contract to the common form. 

 The buffalo berry, in both form-; wa> hlmitit'nl everywhere. Astralagus 

 bixnfottii.i and its near relativ 1 L.n„L'> / ,„,, ■ .r,"-,.u ,.n -nine of the 



