42 JOURNAL OF THE ARNOLD ARBORETUM [vol. v 



leaflets and much larger flowers. In the number of leaflets and in their 

 shape and serratum it is nearer to the var. Buckleyi Sarg. than to the type. 



X Aesculus arnoldiana {A. glabra X A. hybrida), n. hyb. 



Leaves 5-foliolate, their petioles deeply grooved on the upper side, puberu- 

 lous toward the apex, 8-15 cm. in length; leaflets elliptic, long-pointed and 

 acuminate at apex, cuneate at base, finely, often doubly serrate, sparingly 

 floecose-pubescent early in the season becoming glabrous or nearly glabrous 

 above, pubescent along the under side of the midrib and of the from 

 fifteen to twenty pairs of primary veins furnished in their axils with con- 

 spicuous tufts of pale hairs, dull dark green on the upper surface, pale yel- 

 low-green on the lower surface, 9-14 cm. long and 4-5 cm. wide; petiolules 

 pubescent or puberulous, 5-10 mm. in length. Flowers mostly unisexual 

 by abortion of the ovary, yellow, opening the end of May, on slender 

 pubescent pedicels, in short broad densely flowered clusters, pubescent 

 like the short peduncle; calyx campanulate, slightly pubescent; petals 

 villose and glandular on the margin, those of the upper pair marked with 

 red; stamens nearly as long or slightly longer than the petals, sparingly, 

 villose. Fruit roughened by the scattered prickles and occasional by their 

 bases, subglobose, 2-3 em. in diameter, 1-3-seeded; seeds light chestnut- 

 brown, up to 2 cm. in diameter, hilum 5-6 mm. in diameter. 



This tree which sprung up several years ago in the Aesculus Group of 

 the Arboretum in the immediate neighborhood of flowering plants of its 

 supposed parents is a tree from 6.5 to 7 m. high with a slender trunk 

 covered with pale scaly bark. In general appearance it might be taken for 

 a plant of A. glabra from which it differs in the shorter stamens, smaller 

 only slightly roughened fruit and in the presence of glands mixed with the 

 hairs on the margin of the petals showing the influence of one of the Eupa- 

 viae. None of the species of this group had flowered in the Arboretum 

 when the seed which produced this tree germinated and the glands on the 

 margin of the petals can only be accounted for by the influence of A. 

 hybrida D. C, a hybrid it is believed between A. Hippocastanum and A. 

 Pavia, one of the red-flowered Eupaviae. 



Aesculus octandra var. vestita, n. var. 



Differing from the type in the coating of pale tomentum or pubescence 

 on the lower surface of the leaflets and on the petioles and branchlets. 

 This form of the yellow flowered Buckeye which is widely distributed with 

 the species appears to be more abundant westward than on the southern 

 Appalachain Mountains where Aesculus octandra grows to its largest size 

 and is most abundant. 



In the herbarium of this Arboretum are the following specimens of this 

 variety: 



North Carolina. ftoan Mt., Gray, Sargent, Redfield and Canby, June 



19. 1879; Buncombe County, Craggy Mt., T. G. Harbison, Sept. 7, 

 1906. 



