232 TREES AND SHRUBS. 



Malus ioensis, var. Bushii, n. var. 



Leaves oblong-ovate, rounded or broadly cuneate at the base, acute, shallowly serrate or sometimes crenately serrate, less often 

 doubly serrate or slightly lobed, from 5 to 10 centimetres long and from 2.5 to 4.5 centimetres broad, those on vigorous shoots 

 oblong-ovate to ovate, often lobed with from two to five pairs of short and broad coarsely serrate lobes, from 7 to 11 centi- 

 metres long and from 5 to 7 centimetres broad ; at maturity those of the vigorous shoots thinly villose beneath particularly on 

 the veins, the others glabrous or nearly so ; petioles from 1.5 to 3 centimetres in length. Flowers in from four- to six-flowered 

 clusters, on slender villose or sometimes glabrescent pedicels ; calyx more or less densely villose on the outside, rarely whitish 

 tomentose ; calyx-lobes lanceolate, slightly longer than the tube, gradually narrowed into an elongated glabrous mucro ; petals 

 oval, abruptly narrowed into slender claws, the blade 1.5 to 1.8 centimetres long and 1.2 to 1.4 centimetres broad ; stamens 

 about two-thirds as long as the petals or somewhat shorter; styles slightly longer than the stamens, villose at the base for 

 one-third of their length. Fruit depressed-globose, with a very shallow cavity at the base and a slight cavity at the apex, some- 

 times irregularly and rather deeply grooved, from 2.5 to 3 centimetres high and from 3 to 3.5 centimetres in diameter, green 

 and viscid. 



Branchlets thinly tomentose while young, particularly toward the apex, becoming purplish or grayish brown the second year ; 

 the older branches often furnished with spines from 1 to 4 centimetres long. 



Missouri : Williamsville, Wayne County, B. F Bush, April 24, 1912 (No. 6634, type), October 10, 1912 (No. 6951 a), April 

 29, 1902 (No. 1465); Monteer, Shannon County, B. F Bush, October 20, 1911 (No. 6518), April 27, 1912 (No. 6656). 



This variety differs from the type in its less deeply lobed and glabrescent leaves. It is nearest to var. Palmeri Rehder, but is 

 easily distinguished by its oblong-lanceolate acute less pubescent leaves. The leaves of the flowering branchlets and short branch- 

 lets resemble those of M. lancifolia Rehder, but that species differs in the glabrous calyx and in the leaves being pubescent only 

 while very young. The flowers from Monteer differ from those of the type of this variety in their shorter pedicels and broader 

 erose-denticulate petals. Alfred Rehder. 



EXPLANATION OF THE PLATE. 

 Plate CLXXXIX. Malus platycarpa. 



1. A flowering branch, natural size. 



2. Vertical section of a flower, the petals removed, enlarged. 



3. A petal, enlarged. 



4. A fruiting branch, natural size. 



5. Vertical section of a fruit, natural size. 



