Jones: Flora of Illinois, 128. Apocynaceae 205 



2. Sabatia Adans. 

 S. angularis (L.) Pursh. Rose-pink. Moist soil, local. July-Aug. 



3. Gentian A L. — Gentian 



1. Annuals; corolla without plaits or teeth in the sinuses. 

 2. Corolla-lobes fringed or dentate; flowers 3-5 cm. long. 



3. Leaves lanceolate or ovate-lanceolate, with rounded or subcordate bases; 

 corolla-lobes conspicuously fringed all around the summit, scarcely 

 fringed on the sides; low ground, n. 111., rare. Sept. -Oct. Fringed 



Gentian G. crinita Froel. 



3. Leaves linear or linear-lanceolate; corolla-lobes shortly fringed or 

 merely dentate at the summit, fringed on the sides; meadows, n.e. 



111., rare. Aug.-Oct. Small Fringed Gentian G. procera Holm 



2. Corolla-lobes with entire or rarely denticulate margins; flowers 1-2.5 cm. 



long; dry soil. Aug.-Oct. Stiff Gentian G. quinquefolia L. 



1. Perennials; corolla with membranous toothed or lobed plaits in the sinuses. 



4. Margins of leaves and calyx-lobes scabrous or ciliate; corolla usually blue. 



5. Anthers separate or merely connivent; dry ground in the n. half of the 



state, rare. Aug.-Oct. Downy Gentian G. puberula Michx. 



5. Anthers cohering in a ring or short tube. 



6. Corolla-lobes distinct, longer than or equalling the plaits; wet ground, 



n.e. 111., rare. Aug.-Oct. Soapwort Gentian G. saponaria L. 



6. Corolla-lobes none or minute, the plaits very broad; moist ground, 



rare. Aug.-Oct. Closed Gentian G. andrewsii Griseb. 



4. Margins of leaves and calyx-lobes smooth or nearly so; corolla yellowish 

 white; moist soil, rare. Aug.-Oct. Yellowish Gentian ....G. flavida Gray 



4. Frasera Walt. 



F. carolinensis Walt. American Columbo. Dry ground, rare; known from 

 Cook, Coles, and Crawford counties. June-Aug. 



5. Bartonia Muhl. 



B. vlrginica (L.) BSP. Yellow Bartonia. Moist ground, n. 111., rare. Kan- 

 kakee, Hill in 1873; Oregon, Ogle Co., Waite in 1885. 



6. Obolaria L. 



O. virginica L. Pennywort. Woods and thickets, s. 111., rare. Pulaski Co., 

 Fricke; Cobden, Earle. 



127. Menyanthaceae G. Don — Buckbean Family 



1. Menyanthes L. — Buckbean 

 M. trijoliatd L. In bogs, and shallow water, Lake, Cook, McHenry, and 

 Peoria counties. May-June. 



128. Apocynaceae Lindl. — Dogbane Family 



1. Leaves alternate; flowers in terminal corymbiform cymes; corolla salverform, purple 

 1. Amsonia 



