124 American Midland Naturalist Monograph No. 7 



depilis, lucorum, paucispina, sextilis, taetrica, 

 tarda: C. macros pcnna var. demissa (Sarg. ) 

 Egglest.] C. macrosperma Ashe 



14. Leaves glabrous on both surfaces, firm to subcori- 



aceous at maturity; stamens 15-20; fruiting calyx 

 with a distinct neck; common throughout 111. 



May. [C. con']uncta, dissona Sarg.] 



-C. pruinosa (Wendl.) K.Koch 



13. Calyx-lobes glandular-serrate throughout. 



15. Inflorescence glabrous; Richland, Vemiilion, and 



Wabash counties C. coccinioides Ashe 



15. Inflorescence with pubescent pedicels; thickets and 

 borders of woods, usually near streams in the n. 

 half of 111. [C. albicans, amicta Ashe; C. as- 

 surgens, corusca, delecta, elongata, hillii, magni- 



flora, pedicellata, sertata, trachyphylla Sarg.] 



C. coccinea L. 



11. Leaves persistently softly pubescent beneath; pedicels villous; 

 anthers yellow; fruit usually more or less pubescent, at least 

 toward the base, 12-20 mm in diameter; open woods, usual- 

 ly near streams, apparently the commonest species in 111. 

 Apr. -May. Red Haw. [C. coccinea var. mollis T. & G. ; C. 

 subvillosa Schrad. ; C tomentosa var. mollis (T. & G.) 

 A.Gray; C. lanigera, ridgwayi, sera, umbrosa Sarg.; C. 

 altrix, valens, venosa, verna Ashe; C. mollis var. sera (Sarg.) 

 Egglest.] C. mollis (T. & G.) Scheele 



20. Prunus L. — Plimi. Cheriy 



1. Flowers nearly sessile; ovary and fruit densely tomentose. 



2. Flowers pink; leaves lanceolate; cultivated, and sometimes 

 spontaneous; native of Asia. Apr.-May. Peach. [Amygdalus 

 persica L.] P. persica (L.) Batsch. 



2. Flowers white; leaves ovate; introd. from Eur. and sometimes 



escaped from cult. Apricot P. armcniaca L. 



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



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



(occasionally 6- to 10-flowered in P. mahalcb) . 

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



5. Small trees or tall shrubs with relatively broad lanceolate to 

 oval or obovate leaves toothed to the base, usually ap- 

 pearing after the flowers. 

 6. Leaves lanceolate to ovate-lanceolate, acuminate. 



7. Pedicels 3-6 mm long, puberident; fruit globose, 12-15 

 mm in diameter; forming thickets in sandy soil, 

 chiefly s. 111.; native southward. May. Chickasaw 

 Plum P. angustijolia Marsh. 



