ROSACE-fi. 65 



20. AORIMONIA. Tournefort. 

 L A. Eupitoria, L. Hairy: 2-4 ft. high: racemes spicate: akene 8nbglobo««. 



21. AC-ffiNA, LinnseuB. 

 I. A. triflda, R. & P. Leaves crowded at base: green flowers in tenninAl fpike. 



22. POTERIUM, Linmeua. 



1. P. officinale, B. & H, Flowers deep purple or red in a short apika. 



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



23. 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. Californica, C, & S. Often tall: fruit ovoid, with a neck. 



4. R. spithamea, 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. {Toyou.) 



25. PIRUS, IJnnaeus. 



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



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



26. CRAT-2EGUS, Linnaeus. 



1. C. rivularis, Nutt. Leaves ovate, serrate, rarely lobed. {Haicthom.) 



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



27. AMELANCHLER, Medicua. 

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



CALYCANTHACFJE. 



1. CALYCANTHUS, Linnaous. 

 L O. oceidentalis, H, & A. inner aepals and outer petals lurid purple or red» ^ 

 Inch or more loug, slender, leathery: inner petals uhorter. incurved- 



