124 UNIVERSITY OF MISSOURI STUDIES [366 



302. Q. rubra L. Red oak. 



Oak woods and thickets, especially in moist rich soil. 

 Nova Scotia to Minnesota; Florida to Texas. 



303. Q. Schneckii Britton [g. r^;t:<z«/z Sarg.]. Texan oak. 

 Oak forests and thickets, especially in open places. 

 Michigan to Iowa and Missouri; Florida to Texas. 



304. Q. palustris Du Roi. Pin oak. Swamp black oak. 

 Low plains and swamps; common only north and west of 



Columbia on the coal measures. 



Massachusetts to Wisconsin; Florida to the Indian 

 Territory. 



305. Q. tinctoria Michx. [Q. coccinea titictoria (Michx.) 

 Gray: Q. velutina Lam.]. Black oak. Quercitron. 



Rocky uplands and hillsides; common. 



Maine and Ontario to Minnesota and Nebraska; Flor- 

 ida to Texas. 

 305 a. Q. tinctoria Michx. X Q. paJustris Du Roi. 



One tree north of More's Lake. 



Missouri. 



306. Q. alba L. White oak. 



Oak forests and thickets in all soils; very common and 

 variable in leaf-contour. 



Maine to Minnesota and Nebraska. 



307. Q. obtusiloba Michx. [g. /««>wr (Marsh.) Sarg.: <2. 

 stellata Wang.]. Post oak. 



Fringing the tops of cliffs in sterile soil; also on hills near 

 Rocheport. 



Massachusetts to Michigan and Kansas; Florida to 

 Texas. 



308. Q. macrocarpa Michx. Bur oak. 



Frequent in heavy clay soil: very variable both in the size 

 of the acorns and in the lobing of the leaves. 



Nova Scotia to Manitoba and Wyoming; Georgia to 

 Texas. 



309. Q. platanoides (Lam.) Sudw. [Q. bicolor Willd.]. 

 Swamp oak. 



Low swampy grounds and flats; more abundant east of 

 Columbia. 



