188 American Midland Naturalist Monograph No. 7 



4. Frasera Walt. — American Columbo 

 F. carolmicyisis Walt. Dry ground, in the southern half of the state. 

 June-Aug. [Swertia caroliniensis (Walt.) Kuntze] 



5. Bartonia Muhl. 



B. virginica (L.) BSP. Yellow Bartonia. Moist ground, rare; 

 Clark, Cook, Kankakee, Ogle. Will, and Winnebago counties. 



6. Obolaria L. — Pennywort 

 O. virginica L. Woods and thickets, southern 111., rare. 



103. Menyanthaceae G. Don — Buckbean Family 



1. Menyanthes L. — Buckbean 

 M. trijoliata L. In bogs and shallow water; Cook, Kane, Kankakee, 

 Lake, McHenry, and Peoria counties. May-June. 



104. Polemoniaceae Juss. — Phlox Family 



1. Leaves opposite, simple, entire; corolla salverform 1. Phlox 



1. Leaves alternate. 



2. Leaves simple, entire (our species) ; corolla pink, salverform; plants 



annual 2. Collomia 



2. Leaves pinnate or pinnately parted: plants perennial (our species). 



3. Leaves pinnately parted into filiform divisions and the corolla scarlet, 



pink or white, 2.5-3.5 cm long (our species) 3. Gilia 



3. Leaves odd-pinnate; corolla blue 4. Polernonium 



1. Phlox L. — Phlox 

 1. Stem erect or ascending, 30-120 cm tall; corolla-lobes entire or 

 emarginate. 

 2. Lobes of the calyx not longer than its tube. 



3. Calyx-lobes subulate; panicle pyramidal; leaves often 3 cm 

 broad; alluvial soil; extending northward to Knox and 



Kankakee counties. July-Sept. Garden Phlox 



P. paniculata L. 



3. Calyx-lobes lanceolate; leaves usually less than 2 cm broad. 

 4. Flowers in an elongated panicle usually more than twice as 

 long as wide; stem often purple-streaked; moist ground, 

 locally in the northern hall of the state. June-Aug. 



Sweet-William Phlox P. maculata L. 



4. Flowers in corymbiform cymes; stem green; roadsides and 

 and open woods, common. May-July. Smooth Phlox. 

 A hybrid between P. glaberrima and P. pilosa has been 



collected in Champaign Co P. glaberrima L. 



2. Lobes of the calyx longer than its tube. 



5. Upper leaves linear or linear-lanceolate; stem erect or nearly 

 so, without decumbent sterile leafy shoots; sandy soil in 



