Botany of Illinois and Missouri. 117 



Hyssopus nepetoides. Willd. 

 Hab. Banks of the Mississippi, at St. Louis — June. 



Stachys aspera. Mich. 

 Hab. Alluvions of the Mississippi — July. 

 Obs. Plant nearly smooth except the angles of the stem, 

 which are retrosely-hispid. 



Pycnanthemum linifolium. Pursh. 

 Hab. Prairies near St. Louis — July. 



Pycnanthemum pilosum. Nutt. 



P. foliis sessilibus, lanceolatis, subtus tomentosis, obsolete 

 dentatis ; capitulis magnis, terminalibus ; bracteis lanceolato- 

 ovatis, cano-tomentosis. 



Stem eighteen to twenty inches high, pilose, sparingly 

 branched at the summit. Leaves lanceolate, pilose on the 

 under side, prominently veined, obscurely denticulate. Bracts 

 of the length of the calyx, which is also whitish pubescent. 

 Heads larger than in P. lanceolatum. 



Hab. Prairies and barrens. St. Louis — June. 



Dracocephalum virginianum. Lin. 

 Hab. Prairies near St. Louis — July. Entirely resembling 

 the specimens, from the shores of lakes Erie, and Ontario. 



Prunella pennsylvanica. Willd. 

 Hab. Prairies, Illinois and Missouri, frequent — June. 



Scutellaria lateriflora. Lin. 

 Hab. Banks of the Mississippi, at St. Louis — July. 



Scutellaria parvula. Mich. ? 

 Obs. Stem simple, four to six inches high, pubescent 

 above, and on the veins beneath, lower ones petioled and 

 subcordate. Flowers solitary, or in pairs, axillary, small. S. 

 ambigua. P missouriensis Torrey in Lye. Ann. ? 



Scutellaria versicolor. Nutt. 

 Hab. Prairies near St. Louis — July. 



Scutellaria canescens. Nutt. 

 Hab. In similar situations with the last — July. 



DIDYNAMIA. ANGIOSPERMIA. 



Phryma leptospermia. Lin. 



