497 



Hooker's J'lora, excejit that tbe branches of the ('vuie are more upright and the calyx 

 lobes longer. A slender form ajiproacbing /'. efusa was collected at Bull Springs, 

 July 26 (No. 669). 



Potentilla hippiaua diffusa (Gray) Lebm. Add. lud. Hort. Ilaml.. 8(1849); P. 

 ■ diffusa Gray, PI. Fendl. 41 (1849). 



Custer, 1,650 m., August 13 (No. 669^). 



Potentilla gracilis Dougl, ; Hook. Bot. Jlag. Ivii, t. 2984 (1830). 



This plant has always been regarded as P. {/rariUs 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, viii, .557 (1873); 

 r. fastujiata Nutt. ; Torr. & Gr. Fl. i, 440 (1838). 



b'ochford, 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, bitt it seems to have very little 

 relationshiji to P. nivea. It appears to be connected rather with P. concinna humis- 

 slrafa and forms of P. gracilis. The name should also be changed, as there is &V 

 older r. dissecta Pursh. It will be left, however, in the present form until its rela- 

 tionship is settled. 



Rare: Hot Springs, altitudr 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. 673). 



Potentilla concinna humistrata, uom. nov. ; P. concinna humifusa (Nutt.) Lehm. 

 Rev. Pot. 112 (1856) ; F. 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. 673i). 



Potentilla fruticosa L. Sp. PI. 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. Fl. i, 287 (1803). 



Custer, altitude 1,6.50 m., July 18; Rochford, altitude 1,600 m., July 12 (No. 675). 



Rosa engelmanni AVats. Gard. & For. ii, 376 (1889). 



Common in tbe Black Hills: Little Elk CJanyon, altitude 1,100 m., Jnne28; Lead 

 City, July 4; Rochford, July 12; Custer, altitude 1,700 m., August 19 (No. 676). 



Rosa woodsii Lindl. Ros. Monogr. 21 (1820). 



The sepals arc. however, seldom lobed. A character so unstable, should never be 

 used to distinguish the ro.ses.' Hot Springs, altitude 1,050 m., July 17; Hermosa, 

 altitude 1,000 in., June 24 ; Little Elk Canyon, altitude 1,100 m., June 27 (No. 677). 



Rosa arkansana Porter, Port. & Coult. Fl. Col. 38 (1874). 



I thought at first that this must be a form of B. liumilis, as the sepals are deciduous, 

 but the leaflets are different; there are no infrastipular .spines, and tlie calyx is not 

 setose. It agrees bet>t with R. 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., .lune 23 (No. 678). 



Crataegus macrantha Lodd. ; Loud. Arb. ».V Frut. ed. 2, ii, 819 (1851). 



Among the foothills: Hermosa, .nltitude 1,100 ni., June 23; canyon north of Run- 

 kels, altitude 1,300 m., June .30 (No. 679). 



Amelanchier alnifolia Nutt. ; Torr. &. Gr. IT. i, 473 (1840), as synonym; Aronia 

 alni folia 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. 



