494 TRANS. ST. LOUIS ACAD. SCIENCE. 



P. bivalis, Nutt., var. pent andra, (Engel.) Watson, Proc. Amer. 



Acad. 1873 (Revision Poten.) — P. pentandra. Engel. in Torr. &Gray, 



Fl. i. P44J. 



Sandy soil ; infrequent. 



Along- the railroad near lower gate; near first bridge on wagon road south of 

 Ames; bottom-land in "the forks." 



Resembles P. Norregica, and often grows with it, but always in sandy soil. Usu- 

 ally much branched at the very base, but sometimes simple; branches ascending; 

 lower leaves 3-foliolate, but lateral leaflets parted almost to the base, thus appear- 

 ing as if palmately 5 - f'oliolate ; petals minute; stamens usually 6, sometimes more; 

 flowers smaller and pedicels more slender than in the last. The same was collected 

 at Davenport, Sioux City, and Hamburg. The descriptions of this read, "stamens 

 5, opposite the sepals," but all the flowers examined showed usually 6, or sometimes 

 7 or S. In the Engclmann herbarium is a specimen from Neoshe river bottom, 

 labelled " P. pentandra, Engel.," accompanied by a sketch showing 5 stamens. 

 Another specimen from Humboldt county, Iowa, collected by Dr. J. C. Arthur, is 

 accompanied by a note, " stamens 6-8 (10?) ." etc. 



P. Auserina, L. Spec. 



Abundant along the railroad embankment at Jewell Junction. 

 P. Canadensis, L. Spec. 



Dry banks; abundant. 

 Agrimonia Eupatoria, L. Spec. 



Woods ; abundant. 

 Rosa blanda, Ait., var. Arkansana, (Porter) Best, Torr. Bull. 

 xvii. 1890. — R. Arka?isana, Porter, Syn. Fl. Col. 1S74. 



Prairie; abundant. 



This is the common wild rose of central Iowa. It has passed for R. blanda, Ait. 



Pirus coroxaria, L. Spec. 



• Copses ; frequent. 

 Crat^gus coccinea, L., var. mollis, Torr. & Gray, Fl. i. p. 465. 



Woods: frequent. 

 C. tomentosa, L. Spec. 



Woods, chiefly lowland: frequent. 

 C. punctata, Jacq. Hort. Vind. i. 1770. 



Thickets; frequent. 

 Amelanchier Canadensis, (L.) Torr. & Gray, Fl. i. p. 473. 

 Mespilus Canadensis, L. Spec. 



Clav bluffs; not uncommon. Hoggatt's woods ; more abundant on Skunk river. 



SA XIFRA GA CEjE. 



Heuchera hispida, Pursh, Fl. 



Prairie; frequent. 

 Parnassia Caroliniana, Michx. Fl. 



Swamps; scarce. 



Bog near pump-house, and elsewhere. 



Ribes Cynosbati, L. Spec. 



Woods; not uncommon. 

 R. GRACILE, Michx. Fl. 

 Woods; abundant. 



