128 UNIVERSITY OF MISSOURI STUDIES [27O 



Order i6. SANTALES. 



Family 29. SANTALACEAE R. Br. Sandal-wood fam- 

 ily. 



124. COMANDRA Nutt. Bastard toad-flax. 



327. O. umbellata (L.) Nutt. 



Dry open thickets and sterile hills; common. Parasitic 

 on the roots of trees. 



Cape Breton Island to British Columbia; Georgia to 

 California. 



Order 17. ARISTOLOCHIALES. 



Family 30. ARISTOLOCHIACEAE Blume. Birthwort 

 family. 



125. ASARUM L. Asarabacca. 



328. A. ambiguum (Bicknell) Daniels [^A. reflexum am- 

 biguum Bicknell]. Wild ginger. 



Dense patches on the sides of rich ravines; common. 

 Typical A. reflexum Bicknell does not appear to occur, all 

 plants examined having long-attenuate calyx-tips. Plants 

 gathered at Ionia and Alto, Mich., agree with these in every 

 detail, having the wide rectangular sinus in the leaf blades 

 and the triangular calyx-segments abruptly long-attenuate- 

 ly tipped. 



Michigan to Illinois and Missouri. 



126. ARISTOLOOHIA L. Birthwort. 



329. A. Serpentaria L. Virginia snakeroot. 



Rich deep woods; detected in a few places along Grind- 

 stone creek and on a wooded hillside southwest. 

 Connecticut to Michigan; Florida to Missouri. 



Order 18. POLYGONALES. 



Family 31. POLYGONACEAE Lindl. Knotweed fam- 

 ily. 



