OF DENISON UNIVERSITY. 45 



XLII. RUBIACEAE. 



162. HOUSTONIA L. 



312. H. caerulea L. 



Woodlands and rocky hillsides, common. April 9, 1887; April 

 13, 1889; November 17, 1889; January 25, 1890; March 22, i8gi. 



313. H. purpurea L. Var. ciliolata Gray. 



Banks of streams, very rare; two miles southeast of Alexandria. 

 May 23, 1889. 



314. H. purpurea L. Var. longifolia Gray. 



Rocky hillsides, common. August 20, 1888; June 24, 1889; 

 July I, 1891. 



163. Cephalanthus L. 



315. C. occidentalis L. 



Swamps, common. July 9. 1889; July 23, 1890; July 15, 1891. 



164. MiTCHELLA L. 



316. M. repens L. Partridge-berry. 



Rocky, wooded hillsides, common in central and eastern parts of 

 county. June 13, 1890; May 19, 1891. 



165. Galium L. 



317. G. Aparine L. Cleavers. Goose-grass. 



Common everywhere. May 12, 1887; May 21, 1888; April 29, 

 1889; May 27, 1890;, April 28, 1891. 



318. G. pilosum Ait. 



Dry, rocky woods, very rare; Red Rock, Toboso. July 15, 1891. 



319. G. circaezans Michx. Wild Liquorice. 

 Woods, comrrij^n. June 6, 1890. 



320. G. lanceolatum Torr. Wild Liquorice. 



Woods, more common in eastern part of county. June 10, 1890. 



321. G. latifolium Michx. 

 Herbarium of Dr. F. O. Jacobs. 



322. G. trifidum L. Small Bedstraw. 



Moist woods, very common. June 10, 1890; May 19, 1891. 



323. G. trifidum L. Var. latifolium Torr. 



Swamps, less common than type; Reservoir. June 20, i8go'. 



