86o The Trees of Great Britain and Ireland 



II. Ornaster, Koehne and Lingelsheim, Mitt. Deut. Dendr. Gesell. 1906, p. 66 



Calyx present, persistent under the samara. Corolla absent. Flowers ir 

 terminal panicles, appearing with the leaves. Seven species. 



III. Sciadanthus, Cosson et Durieu, Bull. Soc. Bot. France, ii. 367 (1855). 



Calyx present, persistent under the samara. Corolla absent. Flowers in 

 dense fascicled cymes, axillary on the preceding year's shoot. Two species. 



IV. Leptalix, Rafinesque, New Flora, iii. 93 (1836). 



Calyx present, persistent under the samara. Corolla absent. Flowers in 

 panicles, axillary on the preceding year's shoot. About fifteen species. 



V. Fraxinaster, De Candolle, Prod. viii. 276 (in part) (1844). 



Calyx and corolla both absent. Flowers in panicles or racemes on the pre- 

 ceding year's shoot. About twelve species. 



These sections, based on the characters of the flowers, are not available in 

 practice in the determination of living trees, flowering specimens of which are often 

 not obtainable ; and the following key groups the species according to the characters 

 of the branchlets and foliage : — 



Key to the Species in Cultivation 



I. Leaves simple or with two to three leaflets. 



* Branchlets four-angled. 



1. Fraxinus anomala, Watson. Colorada, Utah, Nevada. See p, 898. 



Leaves usually simple, ovate or obovate, glabrous beneath. 



* * Branches terete. 



2. Fraxinus angustifolia, Vahl., var. monophylla. See p. 880. 



Leaves opposite, simple or two- to three - foliolate, lanceolate, glabrous 

 beneath. 



3. Fraxinus excelsior, Linnaeus, var. monophylla. See p, 866. 



Leaves opposite, simple or two- to three-foliolate, ovate or oval, pubescent 

 beneath at the base. 



4. Fraxinus syriaca, Boissier. Western Asia. See p. 883. 



Leaves in whorls. Leaflets usually three (occasionally five to seven occurring 

 on the same branch), lanceolate, glabrous. 



II. Leaves with five or more leaflets? 



A. Branchlets, leaf-rachis, and leaflets quite glabrous. 



* Leaflets stalked. 



5. Fraxinus potamophila. Herder. Turkestan. Seep. 885. 



Leaflets seven to nine, ovate, serrate. 



1 Cf. F. syriaca (No. 4), which has occasionally five to seven leaflets. 



