62 ROSACEAE 



17. Flowers white at center. C. monogyna rosea. 

 Flowers colored throughout. C. monogyna punicea. 



18. Flowers white. 19. 

 Flowers rosy or red. 20. 



19. Fruit bright red. (Hawthorn). C. Oxyacantha. 

 Fruit yellow. C. Oxyacantha aurea. 



20. Flowers single, white at center. C. Oxyacantha bicolor. 

 Flowers double, red throughout. C. Oxyacantha Paulii. 



21. Leaves scarcely longer than broad. C. rotundifolia. 

 Leaves distinctly longer than broad. 22. 



22. Leaves large, softly hairy beneath. 23. 



Leaves glabrate. C. pruinosa. 



23. Armed. C. mollis. 

 Spineless. C. mollis inermis. 



PYEACANTHA. Firethorn. 



Evergreen shrubs with hard brownish wood with numer- 

 ous minute diffused ducts and fine medullary rays; slender 

 somewhat fluted twigs often forming spurs or transformed into 

 spines; small continuous pith; alternate slightly-raised cres- 

 cent-shaped leaf-scars with 3 bundle-traces; scarcely evident 

 stipule-scars; sessile ovoid pointed appressed buds with several 

 exposed scales; rather small lanceolate slender-petioled leaves; 

 small perfect corymbed polypetalous epigynous white flowers; 

 and small typically red pomes with 2-seeded bony core-cavities. 

 Often placed in Crataegus. 



Leaves acute at both ends, low-crenate. P. coccinea. 



RHODOTYPOS. 



Deciduous shrubs with slender terete twigs; relatively 

 large round continuous white pith; opposite somewhat raised 

 triangular or 3-lobed leaf-scars with 3 bundle-traces; minute 

 stipule-scars or stipule remnants; ovoid sessile buds with some 

 3 pairs of exposed scales; large thin wrinkled petioled leaves; 

 few relatively large perfect polypetalous perigynous white 

 flowers ending the branches; and fruit of about 5 black drupes in 

 each enlarged calyx. The buds are often collaterally multiplied. 

 Leaves ovate, acuminate, doubly s'errate. R. kerrioides. 



