266 AMERICAN MIDLAND NATURALIST. 
because of injury to stems, and change to drier soil. One of the 
plants already referred to is at present in full bloom with a very 
large cluster of pure white rather smaller flowers. 
On another trip June 15, 1911, from Lydick, Ind (St. Joseph 
Co.) to Galien, Mich. (Berrien Co.,) along the St. Joseph South 
Bend and Southern Railroad, I came upon a unique group of 
albinoes of various shades of Tradescantia reflexa Raf. The plants 
were growing on the very edge of the Valparaiso glacial lobe, along 
the railroad about four miles from Galien. There were about 
one hundred plants altogether of which very few had the typical 
blue petals of the normal plants. Most of them, about one-half, 
were pale blue, and about one-fourth of the total number were 
perfectly show white without the slightest trace of any other 
color except the yellow veins of the petals. The patch of plants 
extended over an area not exceeding 30 or 40 square meters. 
Though only roughly estimated in number there seemed here 
some apparent relation of Mendel’s Law respecting the variants. 
A specimen was taken for the University Herbarium, (No. 2684) 
but none were transplanted. 
In the low ground before coming to the glacial gravel deposit 
was found at the same time a striking specimen of albino of Iris 
versicolor Linn. not far from other normal Blue Flags. It was pure 
snow white with the exception of the delicate yellow veins on the 
perianth. There was no trace of the usual purple at the base of 
the stem. Its flower was rather smaller than usual, the peduncle 
longer and more slender and the leaves narrower than those of 
the blue flowered plants. Part of the plant was collected with 
flower for the herbarium (No. 2681). The fact of finding albinos of 
two species so close together as also the presence of a large number 
of one of these might suggest some factor in the soil as causing 
the phenomenon. On another occasion I have found a white 
flowered plant of Tradescantia virginica Linn. at Brookland, D.C., 
as also a perfectly white flowered specimen of Prunella vulgaris 
Linn. at the same place. 
