H1PPOCAHTANACE.*: 703 



of Greoiv. the coininon Uorsechestnut of gardens, is largely planted as an ornamental tree in 

 all countries with temperate climates, and now occasionally grows spontaneously in the 

 eastern states. 



The generic name is the classical name of an Oak-tree. 



CONSPECTUS OF THE ARBORKSCENT SPECIES OF NORTH AMERICA. 



Winter-buds without a resinous covering. PA VIA. 



Calyx campanulate (occasionally tubular in 3}; margins of the petals ciliate, eglandular; 



flowers usually yellow. OCTANDR^E. 



Fruit covered with prickles: flowers yellow; petals nearly equal in length, shorter than 

 the stamens. 1. A. glabra (A, C). 



Fruit without prickles; flowers yellow or red; petals unequal in length, longer than 

 the stamens. 



Pedicels and calyx glandular-villose. 2. A. octandra (A, C). 



Pedicels and calyx without glandular hairs. 3. A. geoigiana (C). 



Calyx tubular; margins of the unequal petals without hairs, glandular; fruit without 



prickles. EUPAVI^E. 



Lower surface of the leaves glabrous or slightly pubescent along the midrib; flowers 

 red; seeds dark chestnut-brown. 4. A. Pavia (C). 



Lower surface of the leaves tomentose or pubescent; flowers red and yellow, red, or in 

 one form yellow; seed light yellow-brown. 5. A. discolor (C). 



Winter-buds resinous; petals nearly equal in length, shorter than the stamens; fruit with- 

 out prickles. CALOTHYRSUS. 6. A. calif ornica (G). 



1. Aesculus glabra Willd. Ohio Buckeye. Fetid Buckeye. 



Leaves with a slender petiole 4'-6' long and enlarged at the end, a rachis often furnished 

 on the upper side with clusters of dark brow r n chaff-like scales surrounding the base of the 

 petiolules, and 5 rarely 7 (var. BucUeyi Sarg.) oval-oblong or obovate acuminate leaflets 



Fig. 633 



gradually narrowed to the elongated entire base, finely and unequally serrate above, at first 

 sessile, becoming slightly petiolulate at maturity, covered on the lower surface like the peti- 

 oles when they first appear with floccose deciduous hairs most abundant on the midrib and 

 veins, and at maturity glabrous with the exception of a few hairs along the under side of the 

 conspicuous yellow midrib and in the axils of the principal veins, or rarely covered below 

 with close dense pubescence persistent during the season (var. pallida, Kirch.); yellow- 

 green, paler on the lower than on the upper surface, 4'-6' long and l'-2^' wide; turning 



