IOWA ACADEMY OF SCIENCES. 
73 
The plants in the first list seemed to be restricted to the 
exposure and have not been collected anywhere else in the 
northwc stern part of the state by the author, nor have they 
been reported from that section excepting from the immediate 
locality under consideration. They are:* 
Talinum teretifolium Pursh. Abundant. Also reported from 
Woodbury county. 
Hosackia purshiana Benth. Abundant. In fruit. Also 
reported from Henry and Woodbury counties. 
Opuntia fragilis Nutt. Common. A few fruits were found. 
Aphyllon ludovicianum Gray. Not common. Not heretofore 
reported from the state. 
IsantJius cmruleus Mx. Not common. A stunted unbranched 
form. The species occurs in Henry, Muscatine and Johnson 
counties, in the eastern part of the state. 
Polygonum tenue Mx. Common. Also reported from Linn 
and Muscatine counties. 
Buchloe dactyloides Eng. Staminate plants were not rare. 
Woodsia scopulina Eaton. Rather common. Pound in crev- 
ices of the rock. This has not been reported from the state. 
The specimens, which were collected with fruit in all stages of 
development, are typical. 
Selaginella rupestris Spring. Common. The species is also 
reported from Muscatine, Winneshiek and Benton counties. 
Aster ella Jiemisplicerica Beauv. Not common. Abundant in the 
eastern part of the state. With the exception of the liverwort 
Asterella all of the species in the list are distinctly dry and bar- 
ren ground plants, and even the exception commonly occurs in 
places which are wet only during a short period each year. It 
will be noticed also that the species belong largely to the flora 
of the dry western and northwestern plains. 
The second list includes plants which occur on this exposure, 
but are also found upon dry, sandy, or gravelly hillsides on 
the prairies throughout the northwestern part of the state, and 
also in isolated localities in other parts of the state upon 
sandy, barren tracts. These also belong to the western flora. 
They are: 
Astragalus lotiflorus Hook. Not common. Pound also on the 
barren hills near Granite. Heretofore reported only from Pre- 
mont county. 
* The nomenclature here employed, excepting that of the lichens, is, like that of 
most of the Iowa lists heretofore published, that of Gray’s Manual. Without regard to 
the merits of the nomenclature controversy, this will make the notes more convenient 
for comparisons. 
