Jones: Flora of Illinois, 83. Rosaceae 157 



pastures, or open woods, usually near streams, n.e. 111. May. 

 [C. aptomorpha Sarg.; C. bella Sarg.; C. colorata Sarg.; C. 

 cyanophylla Sarg.; C. depilis Sarg.; C. egani Ashe; C. fer- 

 rissii Ashe; C. ignea Sarg.; C. liicorurii Sarg.; C. magniflora 

 Sarg.; C. otiosa Ashe; C. paucispina Sarg.; C. sextilis Sarg.; 

 C. taetrica Sarg.; C. tenera Ashe; C. trachypbylla Sarg.; C. 

 M/>er Ashe} C. macros perma Ashe 



12. Leaves glabrous on both surfaces, firm to stibcoriaceous at ma- 



turity; stamens about 20; fruiting calyx with a distinct neck; 

 common throughout 111. May. [C. dissona Sarg.; C. con- 



juncta Sarg.; C. patrum Sarg 



C. pruinosa (Wendl.) K. Koch 



1 1 . Calyx-lobes glandular-serrate throughout. 



13. Inflorescence glabrous; Wabash Co., Schneck- [C eggertii 



Britt.] - C. coccinioides Ashe 



13. Inflorescence with pubescent pedicels; thickets and borders of 

 woods, usually near streams, in the n. half of 111. [C. accliva 

 Sarg.; C. arcnata Sarg.; C. assurgens Sarg.; C. corusca Sarg.; 

 C. delecta Sarg.; C. elongata Sarg.; C. pura Sarg.; C. sertata 

 Sarg.} C. pedicelldta Sarg. 



9. Leaves persistently softly pubescent beneath; pedicels villous; anthers 

 yellow; fruit usually more or less pubescent, at leapt toward the base, 

 12-20 mm. in diameter; open woods, usually near streams, apparently 

 the com.monest species in III. May. [C. lanigera Sarg.; C. lasiantha 



Sarg.; C. umbrosa Sarg.; C. valens Sarg.} 



C. jnollis (T. &: G.) Scheele 



19. Prunus L. — Plum. Cherry 



1. Flowers nearly sessile, solitary, large, pink; ovary and fruit densely tomen- 

 tose; stone deeply pitted; leaves appearing later, lanceolate, acuminate, 

 serrulate, glabrous, the upper surface glossy; cult, and sometimes spon- 

 taneous; native of Asia. Apr.-May. Peach [^Airiygdaliis persica L.} 



P. persica (L.) Batsch. 



1. Flowers pedicelled, white; ovary and fruit glabrous. 



2. Flowers in small umbels or corymbs, usually 2-5 or solitary, or in 6-10- 

 flowered racemes in P. mahaleb. 

 3. Flowers small, the petals only 3-6 mm. long. 



4. Small trees or tall shrubs with relatively broad lanceolate to oval or 

 obovate leaves toothed to the base, usually appearing after the 

 flowers. 

 5. Leaves lanceolate to ovate-lanceolate, acuminate. 



6. Pedicels 3-6 mm. long, puberulent; fruit globose, 12-15 mm. in 

 diameter; forming thickets in sandy soil, chiefly s. 111.; native 



southw. May. Chickasaw Plum P. angustifolia Marsh. 



6. Pedicels 8-14 mm. long, glabrous; fruit 6-7 mm. in diameter; 



wet woods, or in bogs, n. 111. Apr. Wild Red Cherry 



P. pennsylvanica L.f. 



