ROSACEiE. 53 



20. AGRIMONIA, Tournefort. 

 1. A. Eupitoria, L. Hairy: 2-4 ft. high: racemes spicate: akene Bubglobose. 



21. ACS^NA, Linnaeus. 

 1. A. trifida, R. & P. Leaves crowded at base: green flowers in terminal spike. 



22. POTERIUM, Linnaeus. 



1. P. ofS.ciiLale, B. & H. Flowers deep purple or red in a short spike. 



2. P. annuum, Nutt. Smaller: leaflets pinnatifid: flowers greenish. 



231 ROSA, Tournefort. 



1. R. Nutkana, Presl. Spines stout: stipules broad; flowers 2 or 3 inches broad. 



2. R. pisocarpa, Gr. Globose fruit smaller, with a neck. 



3. R. Calif ornica, C. & S. Often tall: fruit ovoid, with a neck. 



4. R. spith.aniea, Watson. A span high or less: globose fruit glandular-prickly. 



5. R. gymnocarpa, Nutt. Slender: calyx-lobes deciduous, leaving fruit naked. 



24. HETEROMELES, J. Roemer. 

 1. H. arbutifolia, Rcem. Panicles terminal: fruit ripe in December. (Toyon.) 



25. PIRUS, LinnaBus. 



1. P. rivTilaris, Dougl. Leaves simple, woolly: fruit ovoid, 



2. P. sazubucifolia, C. & S. Leaved pinnate: fruit globose, red. 



26. CRATAEGUS, Linnaaus. 



1. C. rivTilaris, Xutt. Leaves ovate, serrate, rarely lobed. {Hawthorn.) 



2, C. Douglasii, Lindl. A large tree: leaves often incised: fruit 6 lines thick. 



27. AMEL.ANCHIER, Medicus. 

 1. A. alnifolia, Nutt. Flowers in short racemes: petals not ovate. (Shad-berry.) 



CALYCANTHACEJE. 



1. CALYCANTHUS, Linnteus. 

 C. oceidentalis, 11. & A. Inner sepals and outer petals lurid purple or red, an 

 inch or nioro long, slender, leathery: inner petals shorter, incurved. 



