ROSACE^L 55 



20. AGBHtONIA, Tournefort. 

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



21. AC.2ENA, Linnaeus. 

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



22. POTEBIUM, Linnaeus. 



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



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



23. ROSA, Tournefort. 



1. B. Nutkana, PresL Spines stout: stipules broad; flowers 2 or 3 inches broad* 



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



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



4. B. spithamea, Watson. A span high or less: globose fruit glandular-prickly. 



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



24. HETEBOMELES, J. Rcemer. 

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



25. PIBUS, Linnaeus. 



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



2. P. sambucifolia, C. & S. Leaves pinnate: fruit globose, red. 



26. CBAT2EGUS, Linnaeus. 



1. 0. rivnlaris, Nutt. Leaves ovate, serrate, rarely lobed. (Hawthorn.) 



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



27. ATYTELANCHIEB, Medicua. 

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



CALYCANTHACE2E. 



1. CALYCANTHTJS, Linnaeus. 



0. OCCidentalis, H. & A. Inner sepals and outer petals lurid purple or red, to 

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



