49° TRANS. ST. LOUIS ACAD. SCIENCE. 



Acer saccharum, Marsh., var. nigrum, (Michx. f.) Britton, 

 Trans. X. V. Acad. Sci. .ix 18S9. — ^- nigrum- Michx. f. Arb. Amer. 

 ii. 1810. — A. sacchartnum. Wang., var. nigrum, Torr. cV Gray. Fl. i. 

 p. 24S. Upland woods; frequent. 



A. saccharinum, L. Spec— A. dasjj carp u in, Ehrh. Beitr.iv. 1789. 



Low woods; common. 

 Negundo aceroides, Moench, Meth. 1794.— Acer Negundo, L. 

 Spec. 



Low woods ; abundant. 

 Staphylea trifolia, L. Spec. 



Moist woods; not uncommon. 



A A A CA RDIA CEjE. 



Rhus glabra, L. Spec. 



Open upland woods, especially along the borders ; abundant. 

 R. radicans, L. Spec— E. Toxicodendron, L. Spec. 



Two species, R. raidcans and R. Toxicodendron, were recognized in the Species 

 Plantarum. These are now quite generally considered as but forms of one species, 

 whicli should take the name having priority of position. Engler ( Anacard. in DC 

 Mon. Plian. iv. 1SS3) uses R. Toxicodendron, L. emend, Torr. & Gray, which includes 

 four subspecies. The first is the only one with which we are concerned : C/Z vulga- 

 ris, Pursh, Fl. Under this two forms are recognized — 1. radicans (R. radicans, L.) ; 

 2. volubilis, DC. Prod. ii. {R. Toxicodendron, L.) 



We have both forms: 1. climbing high on trunks by rootlets, leaves usually large 

 and entire or sparingly dentate ; frequent on bottom-land. 2. Low, erect, or twin- 

 ing, leaves smaller and usually deeply notched; found on drier soil, fence rows, etc. 

 But the low form occasionally has entire leaves, and the rooting form dentate leaves. 

 If the latter form is kept as a variety it is R. radicans, L., var. Toxicodendron, 

 Pers. Syn. i. 



POLTGALACEjE. 



Polygala Senega, L. Spec. 



Rich upland woods; frequent. 

 P. INCARNATA, L. Spec. 



Moist prairie ; infrequent. 

 P. SANGCINEA, L. Spec. 



Along sloughs ; frequent. 

 P. VERTICILLATA, L. Spec. 



Prairie and open woods; infrequent. 



LEGUMINGS^E. 



Baptisia leucophjea, Nutt. Gen. 

 Prairie; not uncommon. 



B. leucantha, Torr. & Gray, FL i. p. 385. 



Low ground ; frequent. 



This appears first as Podalyria alba, Sims, Bot. Mag. 1S09. Uaptisia, Vent. 

 was separated in 1808. Our plant loses its birthright in the specific name alba by 

 being transferred to Baptisia too late (B. alba, Hook. Fl. Bor.-Am.), there being 

 already B. alba, R. Br. 1S10. 



Trifolium arvense, L. Spec. 



"Ames, 1871, Bessey." One specimen in I. A. C. herbarium. 





