872 



RUBIACEAE 



Houston ia 



^30 



Map 1908 



Houstonia anqustifolia Michx 



~W 



Map 1909 



Houstonia longifolia Gaertn. 



So 



Map 1910 



Cephalanthus occidentalis L 



River in a woods in Harrison County in sec. 14 about 4 miles southeast of 

 Laconia. It occurs also on the slope of the high gravelly terrace of Big 

 Wea Creek about 4 miles southwest of Lafayette, Tippecanoe County. 



Ind. to Kans., southw. to Fla. and Tex. 



4. Houstonia longifolia Gaertn. Longleaf Bluets. Map 1909. Prob- 

 ably infrequent throughout the state on bare places on the crests of wooded 

 ridges, on washed wooded slopes, and more rarely in moist, low woodland. 

 It is commonly found on bare, gravelly places in woodland of all kinds 

 but most commonly on the terraces of streams. 



This species is variable in the form of the leaves and in the amount 

 of pubescence. Some leaves are nearly glabrous but the leaves of many 

 specimens are more or less harsh-pubescent above ; some are more or less 

 pubescent all over above ; some are pubescent only on the nerves and 

 margin, and there are a few with only the margin rough-pubescent. I 

 have not seen a specimen with the basal leaves strictly ciliate. I have 

 specimens with the leaf margins rough-pubescent but the pubescence is 

 not in lines and I do not class them as ciliate. Houstonia canadensis has 

 been reported 13 times from Indiana and I had all my specimens so 

 labeled, but after a careful restudy of the material, I changed all of them 

 to Houstonia longifolia. I do not believe we have typical Houstonia 

 canadensis in Indiana. Reported by many Indiana authors as Houstonia 

 ciliolata Torr. 



Maine to Man., southw. to Ga. and Mo. 



8230. CEPHALANTHUS L. Buttonbush 

 Branchlets, peduncles, petioles, and under surface of the leaves glabrous 



l.C. occidentalis. 



Branchlets, peduncles, petioles, and under surface of the leaves more or less pubescent. 



la. C. occidentalis var. pubescens. 



1. Cephalanthus occidentalis L. COMMON BUTTONBUSH. Map 1910. 

 Throughout the state in ponds and swamps and on the borders of lakes 

 and streams. Found also in Tippecanoe County on a high gravelly slope 

 about 4 miles southwest of Lafayette. 



