513 



Steironenia ciliatuni (L.) ISaudo, Ann. Sci. Nat. ser. 2, xx, 346 (1843) ; Li/simarhia 

 ciliafa L. 8p. PI. 147 (1753). 



The leaves of the specimens Irom Custer are scarcely snbcordate at the base. 

 Kochford, altitnde 1,600 m., July 11; east of Custer, ou the French Creek, alti- 

 tude, 1.500 ra., July 22 (No. 866). 



Naiimbiirgia thyrsiflora (L.) Duhy, in DC. Prodr. viii, 60 (1844); Li/simachia 

 ihijrsijlora L. Sp. PI. i, 147 (1753). 



"Wet places: Elk Canyon, altitude 1,200 in., July 2!i (No. 867). 



Centuuculus minimus L. Sp. PI.- i, 116 (1753). 



In Eul.y Gulch, uortliwest of Custer, altitnde 1,700 ni , Auyust 20 (No. 868). 



OLEACE^. 



Fraxinus peiuisylvanica Marsh. Arb. Aracr. 51 (1785). 

 Along Squaw Creek, above Hermosa, altitude 1,050 m., June 22 (No. 869). 

 Fraxinus pennsylvanica lanceolata (Borck.) Sargent, Silva Anier. vi, 50 (1894); 

 Fraxxuuslannolata Borck. Handb. P'orstbot. i, 826 (1800). 

 Together -with the preceding (No. 870). 



APOCYNACEiE. 



Apocyniim androsaemifolium L. Sp. PI. 1, 213 (1753). 



Borders of woods: Hermosa, altitude 1,100 ni., June 24; Eapid City, altitude 

 1,000 m., July 25; Little Elk Canyon, altitude 1,100 m., June 27; Lead City, altitude 

 1,700 m., July 6 (No. 871). Specimens collected in Elk Canyon, altitude 1,200 m., 

 June 29, and at Hot Springs, altitude 1,100 m., August 3, are ambiguous between 

 this species and A. cavuabinum. The leaves are short-petioled, and the corolla 

 greenish white and smaller than in J. androsa-wifoJium, and the branches upright 

 (No. 872). 



ASCLEPIADACEiE. 



Asclepias ovalifolia Dec. in DC. Prodr. viii, 567 (1844). 



On French Crerk, below Custer, altitude 1,500 m., July 22 (No. 873). 



Asclepias verticillata pumila Gray, Proc. Amer. Acad, xii, 71 (1876). 



Prairie: Minnekahta, altitude 1,300 m., August 6 (No. 874). 



Acerates angustifolia ' (Nutt.) Dec. in DC. Prodr. viii, 522 (1844) ; PoJijotus ancjnsti- 

 folinx Nutt. Trans. Amer. Phil. Soc. n. ser. v, 20 (1833-1837). 



Minnekahta I'lains, altitude 1,300 m., August 6 (No. 875). 



Acerates \rjiridiflora -' (K;if. ) Eat. Man. ed, 5,00 (1829); Asclepias viridijlora Paf. 

 Med.Kei). xi,360 (1808). 



Only one specimen Avas collected: Minnekahta I'lains, altitude 1,300 m., August 6 

 (No. 876). 



GENTIANACEiE. 



Gentiana acuta Mx. Fl. i, 177 (1803); Gentiana amareUa acuta Herder, Act. Hort. 

 Petroj). 1,428 (1872). 



'J'be specimen appears to be a form of this species modified by the habitat, viz, a 

 heavily shaded hillside. The whole jilant is light green, the leaves broad and thin, 

 3- to 5-ribbed. Young plants can scarcely be distinguished from those of the next. 

 The llowers are greenish yellow, occasionally a little bluish on the limb. South of 

 Custer, altitude 1,700 m., August 15 (No. 877). 



'See my remarks on this species, this volume, p. 169. 



-The binomial is not given by Elliott (Hot. S. Car. & Georg. 317, 1823), but he refers 

 A8ch'2)iuH ciiidijlora to the genus Acerates. 



