^sculus 209 



^sculus plantierensis, Andr^, a supposed hybrid between yEsculus carnea and 

 y^sculus Hippocastanum, will be mentioned under the former species. ^sculus 

 versicolor, Dippel, a hybrid between ^sculus Pavia and ^sculus octandra, will be 

 treated under the latter species. 



The following key to the species in cultivation is based on the characters of the 

 leaves and buds. In Plate 61 the leaves of all these species are shown ; and in 

 Plate 62 are represented the twigs and buds of six species, viz., Hippocastanum, 

 carnea, indica, glabra, octandra, and calif arnica : 



A. Leaflets sessile or nearly so ; buds very viscid. 



1. j^sculus Hippocastanum. 



Petioles glabrescent. Leaflets obtusely and irregularly serrate. 



2. ^sculus turbinata. 



Petioles pubescent, especially towards their tips. Leaflets regularly and 

 crenately serrate. 



B. Leaflets stalked. 



*Buds viscid. 



3. y^sculus indica. 



Leaflets finely and sharply serrate, pale beneath. Buds very viscid. 



4. ^sculus carnea. 



Leaflets obtusely and irregularly serrate. Buds only slightly viscid, the brown 

 scales having a dark-coloured margin. 



5. ^sculus calif ornica. 



Leaflets shallowly and crenately serrate, pale beneath. Buds viscid, glisten- 

 ing with white resin. 

 ** Buds not viscid. 



6. ^sculus parviflora. 



Leaflets densely grey-tomentose beneath, finely serrate in margin. Buds 

 minutely pubescent. 



7. j^sculus octandra. 



Leaflets pubescent beneath, broadly lanceolate, shortly acuminate, with twenty 

 or more pairs of nerves in the terminal leaflet ; margin finely serrate 

 but not usually ciliate. Petioles without jagged marginal ridges. 



8. yEsculus glabra. 



Leaflets glabrous beneath, except for a slight pubescence along the midrib and 

 tufts in the axils, long-acuminate, with about fifteen pairs of nerves in the 

 terminal leaflet, finely serrate with ciliate tufts in the bases of the serrations. 

 Petioles with smooth marginal ridges. 



9. ^sculus Pavia. 



Leaflets slightly pubescent beneath, narrowly lanceolate, finely serrate but not 

 ciliate in margin. Petioles flattened on the upper side, with marginal 

 sharp ridges, usually jagged, i 



n c 



