52 ROSACER. 
15. SIBALDIA, Linnzua,. 
1, 8. procumbens, L. Stems creeping: calyx lobes exceeding the minute petala 
16. HORKELIA, C. &S&. 
Styles thickened at the base: leaflets incised 6-12 lines long.........-cee-+-2+ aveisetelars 1 
Calyx-bracts nearly as broad as the lobes: leaflets 3-8 lines long.......+---+eeeee-ee+ 2 
Calyx-bracts much narrower than the lobes. 
Leaflets deeply incised or lobed.......... pees sabia 8, 4, 5, 6 
Leaflets few-toothed at the truncate apex............+eeeeeeeee PR fh 
Leaflets bifid, 2 or 3 lines long, silky..........-.+seeeeee Puroints iS csyele mais 8 
1, H. fusca, Lindl. Cymes dense: petals 2 lines long, sepals longer. 
2, H. Californica, C.&8. 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-colu. 
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. ...... dren's .. 1, 2,8 
Flowers yellow, in cymes on nearly naked stems. Alpine............ secs wasatee: 45 
Flowers white, in diffuse panicles upon leafy stema.......-....-.-.seeeee rece cee --- 6 
1. I. Pickeringii, Torr. Densely white-silky: petals yellowish, apatite, 
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. pygmea, Watson. An inch or two high: stamens sometimes 10. 
Var. lycopsoides, Watson, Nearly glabrous: leaflets thick, rounded, imbricated. 
6. 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 fiowera, 
