Jones: Flora of Illinois, 131. Polemoniaceae 211 



6. Flowers 2-3 mm. long; calyx-lobes not overlapping; seeds ovoid, 1.5 



mm. long; parasitic on various herbs. June-Oct 



C. campestris Yuncker 



5. Corolla-scales obsolete; calyx-lobes acutish; on Polygonum and other 



herbs. Aug. -Oct C. polygonorum Engelm. 



4. Flowers distinctly short-pedicelled. 

 7. Corolla-lobes with incurved tips. 



8. Scales ovate, fimbriate; capsule enclosed by the corolla; on herbs and 

 low shrubs, chiefly Compositae and Leguminosae; known from St. 

 Clair and Wabash counties C. indecora Choisy 



8. Scales obsolete; withered corolla remaining at the base of the cap- 



sule; parasitic on hazel (Corylus) and other shrubs, and on 



various herbs. Aug. -Oct C. coryli Engelm. 



7. Corolla-lobes spreading or recurved. 



9. Scales small, irregularly fimbriate; capsule depressed-globose; on vari- 



ous herbs and shrubs. Aug. -Oct C. cephalanthi Engelm. 



9. Scales long, fimbriate toward the apex; capsule ovoid; parasitic on a 



number of different species of herbs and shrubs. July-Oct 



_..C. gronovii Willd. 



131. Polemoniaceae DC. — Phlox Family 



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



1 . Leaves alternate. 



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



annual 2. Collomia 



2. Leaves pinnate; corolla tubular-campanulate ; stamens declined; plants perennial 

 (our species) 3. Polemonium 



1. Phlox L. — Phlox 



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

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



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

 alluvial soil; extending northw. to Vermilion, Champaign, and Ful- 

 ton 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; stem often purple-streaked; moist 

 woods along streams; known from Bureau, Stark, and Champaign 



counties. June-Aug. Sweet-william Phlox P. mactdata L. 



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



woods, common. May-July. Smooth Phlox P. glabernma L. 



2. Lobes of the calyx longer than the tube. 



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

 out decumbent sterile leafy shoots; sandy soil in open woods and 

 along roads, common. May-Aug. Downy Phlox. [P. argillacea Clute 



& Ferris] P. pdosa L. 



5. Upper leaves lanceolate or elliptical; stem decumbent at base, bearing 

 sterile leafy shoots; moist woods, common. Apr -June. Blue Phlox 

 P. divaricata L. 



