530 TRANS. ST. LOUIS ACAD. SCIENCE. 



B. ciliatus, L. Spec. 

 Woods; abundant. 

 Var. purgans, (L.) Gray, Man. 1st ed.— B. purgans, L. Spec. 

 Upland woods ; abundant. 



Apparently a distinct species, flowering a month earlier than B. ciliatus. 



Lolium perenne, L. Spec. 



Waste places ; rare. 

 Var. Itaeicum, Vasey, Desc. Cat. 1885. 

 Escaped around the station-house. 

 Agropyrum repens, (L.) Beauv. Agrost. 1812.— Triticum repens, 

 L. Spec. 



Fields and waste places ; frequent. 

 The form which has passed for A, glaucum, Roem. & Schult., is occasionally 

 found. 

 HORDEUM JUBATUM, L. Spec. 



Waste places : common. 

 Elymus Virginicus, L. Spec. 

 River banks ; abundant. 

 Specimens frequently occur which appear to be hybrids with E. Canadensis. 



E. Canadensis, L. Spec. 



River banks ; abundant. 

 Var. glaucifolius, (Muhl.) Gray, Man. 5th ed.— E. glaucifo- 

 lius, Muhl. in Willd. Enum. 

 Gravelly places; frequent. 

 Var. glabrifolius, Vasey, Contr. Nat. Herb. (No descrip- 

 tion.) 



Rocky places; frequent. 

 E. striatus, Willd. Spec. i. 

 Upland woods ; frequent. 

 Asprella Hystrix, (L.) Willd. Enum.— Elymus Hystrix, L. Spec. 

 Woods; abundant. 



E^UISETACEJE. 



Equisetum arvense, L. 



Sandy soil; common. 



FILICES. 



Adiantum pedatum, L. Spec. 



Rich woods; abundant. 

 Pteris aquieina, L. Spec. 



Rich woods ; scarce. 

 Asi-lenium Filix-fosmina, (L.) Bernh. N. Jour. f. d. Bot. ii. 1806. 

 — Polypodium Filix-fcmina, L. Spec. 2d ed. 



Shady ravines ; abundant. 

 CYSTOPTERIS fragilis, (L.) Bernh. I.e. i. 1805.— Poly p odium fra- 

 gile, L. Spec. 2d ed. 



Woods; common. 



