192 UNIVERSITY OF MISSOURI STUDIES [334 



302. SYRINGA L. Lilac. 



725. S. vulgaris L. Common lilac. 

 Tending to spread in old gardens and yards. 



Eastern Europe and the Orient, now common in culti- 

 vation. 



Family 86. GENTIANACEAE Dumort. Gentian family. 



303. SABBATIA Adans. Rose-pink. 



726. S. campestris Nutt. Prairie rose-pink. 

 Open thickets southwest. 



Missouri to Kansas; Arkansas to Texas. 



304. GENTIANA Tourn. IDASYSPHANA 

 Adans.]. Gentian. 



727. G. Andrewsii Griseb. [D. Andreivsii (Griseb.) 

 Small]. Closed gentian. 



Very rare in low grounds and the borders of swamps. 

 Quebec to the Northwest Territory; Georgia to Mis- 

 souri. 



Family 87. APOCYNACEAE Lindl. Dogbane family. 



305. VINOA L. Periwinkle. 



728. V. minor L. Blue periwinkle. 

 Cemeteries and old gardens. 



Europe and Western Asia, common in cultivation. 



306. APOCYNUM L. Dogbane. 



729. A. androsaemifolium L. Common dogbane. 

 Scarce in fields and waste places. 



Anticosti to British Columbia; Georgia to Arizona. 



730. A. urceolifer Miller. Downy dogbane. 

 Roadsides and old fields: some forms resemble closely .(4. 



hypericifolmm Ait., but are densely pubescent, and are per- 

 haps referable to A. pubescetis R. Br. 

 New York and Maryland to Missouri. 



