W. F. Wight of the United States Department of Agriculture has collected specimens of a cultivated plum, taken from the wild, locally known as the Laire, in Rooks and neighboring counties in Kansas, with foliage very similar to _Prunus orthosepela_. While the identity of Laire with the species under discussion cannot be established at this time, the reported source of the seeds, “southern Texas,” from which _Prunus orthosepela_ was grown may be an error. =23.= =PRUNUS GRACILIS= Engelmann and Gray =1.= Engelmann and Gray _Bost. Jour. Nat. Hist._ =5=:243. 1845. =2.= Torrey _Pac. R. Rpt._ =4=:83. 1854. =3.= Britton and Brown _Ill. Fl._ =2=:249, fig. 1897. _P. chicasa_ var. _normalis._ =4.= Torrey and Gray _Fl. N. Am._ =1=:407. 1840. _P. normalis_ =5.= Small _Fl. S. E. U. S._ 572. 1903. Shrub low, attaining a height of five or six feet; branches many, straggling, more or less spiny; branchlets at first densely tomentose or soft-pubescent, becoming glabrous; leaves small, ovate-lanceolate or oval, margins finely and evenly serrate, rather thick, texture harsh and firm; upper surface dark green, glabrous or nearly so at maturity, lower surface paler, soft-pubescent becoming nearly glabrous; petiole short and stout. Flowers white, small, appearing before the leaves; borne in sessile, several-flowered umbels; pedicels short, slender, soft-pubescent. Fruit globose or oval, very small, not more than one-half inch in diameter, variable in color, mostly in shades of red; stone turgid, nearly orbicular, pointed at both ends. _Prunus gracilis_ is found in dry, sandy soils from southern Kansas and western Arkansas to central Texas. It grows most abundantly and thrives best in Oklahoma, a fact which leads Waugh to call it the “Oklahoma” plum. All who know the species agree that it is a near approach to Maritima in many of its characters. This plum is very variable and some of its forms seem not to have been well studied. As a fruit plant Gracilis is hardly known in cultivation though Torrey says it is cultivated in the region of its habitat under the name Prairie Cherry. The wild fruit is used more or less locally and is sometimes offered for sale in the markets of western towns. The quality is about the same as that of the wild Americanas and under cultivation would probably improve. The small size of plant and fruit are the most unpromising characters though the species is also much subject to black-knot. =24.= =PRUNUS RIVULARIS= Scheele =1.= Scheele _Linnaea_ =21=:594. 1848. =2.= Gray _Pl. Wright._ =1=:67. 1852. =3.= Hall _Pl. Texas._ 9. 1873. =4.= _Coulter Cont. U. S. Nat. Herb._ =2=:101. 1891. =5.= Waugh _Bot. Gaz._ =26=:50-52. 1898. =6.= Bailey _Ev. Nat. Fr._ 223. 1898.