796 



The Ashes 



Twigs 4-sided; leaflets 7 to 11; samara rounded or obtuse at 



the base. 

 Twigs round; leaflets 5 to 7; samara narrowed or acute at 

 the base. 

 Samara spatulate to oblong-spatulate. 

 Samara elliptic to ovate or obovate. 

 Body of the samara round or nearly so, the w^ing decurrent 

 upon it. 

 Wing of the samara decurrent on the body to the middle or 

 below. 

 Wing of the samara long-linear. 

 Wing of the samara spatulate or oblong-spatulate. 

 Leaflets all cuneate at the base; western trees. 



Leaflets dark green, shining; samaras 3 to 4 cm. long. 10. 

 Leaflets yellow-green, dull. 11. 



Lateral leaflets not cuneate at the base. 

 Samara-body round. 



Samara-body long-linear; eastern trees. 



Samara broadly spatulate; leaves thick, entire. 

 Samara narrowly spatulate; leaves thin, serrate 

 or entire. 

 Samara-body plump, oblong. 

 Samara-body compressed. 



Samara 7 to 8 cm. long; leaves entire; southern tree. 15. 

 Samara 3 to 4 cm. long; leaves serrate; southwestern 

 tree. 

 Wing of the samara terminal or very nearly so, scarcely 

 decurrent on the seed-body. 

 Twigs and leaves glabrous; or leaves pubescent. 

 Leaflets obtuse or short-pointed. 

 Leaflets acute or acuminate. 

 Twigs and leaves densely pubescent. 

 B. Flowers with a 4-parted or 2-petaIed corolla; western tree?, and shrubs 

 Corolla deeply 4-parted into linear petals. 

 Corolla of 2 oblong or oblong-obovate petals. 

 2. Petioles and leaf-rachis wing-margined; leaflets spatulate to oblong- 

 obovate, 2.5 cm. long or less. 22 



6. F. quadrangulata. 



F. pa uci flora. 

 F. caroliniana. 



9. F. Darlingtonii. 



F. Berlandieri. 

 F. Toumeyi. 



F. Greggii. 



I. ANOMALOUS ASH Fraxinus anomala Torrey 



This small tree differs from all other American species in usually having leaves 

 with but a single leaflet, and this circumstance gave the tree its specific name; 

 occasionally, however, there are from 2 to 5 leaflets. It occurs from west-central 

 Colorado across southern Utah to southern Nevada, and is thus rather narrowly 

 restricted in range. It attains a height of only 7 meters or less, and a trunk 

 diameter of about 1.5 dm., sometimes, indeed, growing as a shrub. 



The bark is dark brown and fissured, 6 to 8 mm. thick; the young twigs are 

 rather sharply 4-angled, and finely hairy, the older ones gray, round and smooth; 

 the usually solitar}- leaflet is at first hair\', but becomes smooth, is slender-stalked 



