497 
Hooker’s Flora, except that the branches of the cyme are more upright and the calyx 
lobes longer. A slender form approaching 7’. effusa was collected at Bull Springs, 
July 26 (No. 669). 
Potentilla hippiana diffusa (Gray) Lehm. Add, Ind. Hort, Hamb. 8 (1849); I 
diffusa Gray, Pl. Fendl. 41 (1849). 
Custer, 1,650 m., August 15 (No, 669%). 
Potentilla gracilis Dougl.; Hook. Bot. Mag. Ivii, t. 2984 (1850). 
This plant has always been regarded as 2. gracilis Dougl., but there is a specimen 
so labeled, collected by Mr. Douglas at Puget Sound, in the Columbia College her- 
- barium, and it seems quite different. 
Lead City, altitude 1,700 m., July 4; Rochford, altitude 1,600 m., July 12 (No. 670), 
Potentilla gracilis fastigiata (Nutt.) Wats, Proc. Amer. Acad. vill, 557 (1873); 
P, fastigiata Nutt.; Torr, & Gr. Fl. i, 440 (1888). 
Rochford, altitude 1,550 m., July 11 (No. 671). 
Potentilla nivea dissecta Wats. Proc. Amer, Acad. viii, 559 (1873). 
This form was included in Dr. Watson’s variety, but it seems to have very little 
relationship to P. nivea. It appears to be connected rather with P. concinna humis- 
strata and forms of LP. gracilis. ‘The name should also be changed, as there is ap 
older P. dissecta Pursh. It will be left, however, in the present form until its rela- 
tionship is settled. 
Rare: Hot Springs, altitude 1,100 m., June 11 (No. 672), 
Potentilla concinna Richards. App. Frankl. Journ. ed. 2, 20 (1823), 
Custer, altitude 1,650 m., June 3 (No. 675). 
Potentilla concinna humistrata, nom. nov.; 2. concinna humifusa (Nutt. ) Lehm. 
Rev. Pot. 112 (1856); P. humifusa Nutt. Gen. i, 310 (1818), not Willd.; Schlecht. Gesell. 
Naturf. Freunde Berlin Mag. vii, 289 (1813). 
Hills north of Deadwood, altitude 1,500 m., July 5 (No. 6735). 
Potentilla fruticosa L. Sp. P1.i, 495 (1753). 
Dry hills and mountain sides: Elk Canyon, altitude 1,300 m., June 29; Rochford, 
altitude 1,700 m., July 12 (No. 674). 
Agrimonia striata Mx. V1. i, 287 (1803). 
Custer, altitude 1,650 m., July 18; Rochford, altitude 1,600 m., July 12 (No. 675). 
Rosa engelmanni Wats. Gard. & For, ii, 876 (1889). 
Common in the Black Hills: Little Elk Canyon, altitude 1,100 m., June 28; Lead 
City, July 4; Rochford, July 12; Custer, altit ude 1,700 m., August 19 (No. 676). 
Rosa woodsii Lind]. Ros. Monogr. 21 (1820). 
The sepals are, however, seldom lobed. A character so unstable, should never be 
used to distinguish the roses.’ Hot Springs, altitude 1, 050 m., July 17; Hermosa, 
altitude 1,000 m., June 24; Little Elk Canyon, altitude 1,100 m., June 27 (No, 677). 
Rosa arkansana Porter, Port. & Coult. F1. Col. 38 (1874). 
I thought at first that this must be a form of 2. humilis, as the sepals are deciduous, 
but the leaflets are different; there are no infrastipular spines, and the calyx is not 
setose. It agrees best with f. arkansana, except as to the deciduous sepals, A very 
low shrub, only 1 to 2 dm, high, growing on a very dry hill near Hermosa, altitude 
1,100 m., June 23 (No, 678). 
Cratzgus macrantha Lodd.; Loud. Arb. & Frut, ed. 2, ii, 819 (1854). 
Among the foothills: Hermosa, altitude 1,100 m., June 23; canyon north of Run- 
kels, altitude 1,300 m., June 30 (No. 679). 
Amelanchier alnifolia Nutt.; Torr. & Gr. Fl. i, 473 (1840), as synonym; Aronia 
alnifolia Nutt. Gen. i, 306 > (1818). 
The character is not ¢ given in the original description (Lindley, on the contrary, 
states that the sepals are entire) and seems to have been added by Dr, Watson. 
