52 ROSACEiB. 



15. SIBALDIA, Linnaeus. 



1. S. procumbens, L. Stems creeping: calyx lobes exceeding the minute petals. 



16. HORKELIA, 0. & S. 



Styles thickened at the base: leaflets incised 6-12 lines long 1 



Calyx-bracts nearly as broad as the lobes: leaflets 3-8 lines long 2 



Calyx-bracts much narrower than the lobes. 



Leaflets deeply incised or lobed , 3, 4, 5, 6 



Leaflets few-toothed at the truncate apex 7 



Leaflets bifid, 2 or 3 lines long, silky 8 



1. H. fusca, Lindl. Cymes dense: petals 2 lines long, sepals longer. 



2, H. Californica, C. & S. Glandular: sepals and petals 3-6 lines long. 

 Var. sericea, Gr. Stouter: leaflets larger: canescent with silky hairs. 



8. H. congesta, Hook. Sparsely stifF-hairy: leaflets 6-9 lines long. 



4. H. tenuiloba, Gr. White-hairy: leaflets 8-12 pairs, 2-3 lines long. 



5 H. Bolanderi, Gr. Densely hoary, pubescent, tufted, 3-4 inches high. 



6. H. purpurascens, Watson. Purplish calyx 3-4 lines long: petals rose-color. 



7. H. tridentata, Torr. Silky : leaflets 2-5 pairs, mostly 3-toothed at apex. 



8. H. sericata, Watson. Tufted: some stem leaflets entire: petals notched. 



17. IVESIA, Torrey&Gray. 



Flowers in rather close panicled cymes: stems mostly leafy 1, 2, 3 



Flowers yellow, in cymes on nearly naked stems. Alpine 4, 5 



Flowers white, in difi"use panicles upon leafy stems 6 



1. I. Pickeringii, Torr. Densely white-silky: petals yellowish, spatulate. 



2. I. unguiculata, Gr. Similar: petals white, clawed, orbicular: carpels 5-8. 



3. I. Webberi, Gr. Low, loosely villous: petals yellow: stamens 5-10. 



4. I. Gordoni, T. & G. Viscid: 3-10 inches high: stem leaves pinnatifid. 

 Var. pygmaea, Watson. An inch or two high: stamens sometimes 10. 



Var. lycopsoides, Watson. Nearly glabrous: leaflets thick, rounded, imbricated. 



5. I. Muirii, Gr. Densely silky, an inch high: leaves terete: carpels 2. 



6. I. santalinoides, Gr. Stems 6-18 inches high: leaves silky: terete: carpel 1. 



18. ADENOSTOMA, H. & A. 



1. A. fasciculatum, H. & A. Bark becoming shreddy: leaves subulate, acute. 



2. A. sparsifolium, Torr. Resinous: leaves scattered, obtuse. San Diego. 



19. ALCHEMILLA, Tournefort. 

 1. A. arvensis, Scopoli. An obscure under-herb: stipules enclosing the flowers. 



