104 DUDLEY MEMORIAL VOLUME 



lets of the previous year; cones globose or nearly so, maturing the first year, 

 their scales spirally arranged, thickened at apex and mucronate; seeds 2 to 

 each scale, triangular, winged. 

 Leaves deciduous; flowers appearing in the spring. 



1. T. distichum. 

 Leaves persistent; flowers appearing in the autumn. 



2. T. mucronatum. 



I. Taxodium distichum Rich. Bald Cypress. 



Leaves deciduous in the autumn, narrowly linear, light green, Yz-'fy 

 inch long; staminate flowers purplish, in panicles 4-5 inches long; cones 1 

 inch long, without mucros at maturity. 



Tall tree becoming 150 feet high, with a buttressed trunk, sometimes 12 

 feet in diameter. Native of the southeastern United States. A handsome 

 specimen of this very ornamental tree is near the Angel of Grief, and another 

 young tree is at 23 Salvatierra. 



2. Taxodium mucronatum Tenore. Mexican Bald Cypress. 



Similar to the last but leaves persistent through the winter; flowers ap- 

 pearing in the autumn instead of the spring; pollen-sacs 7-9 instead of 4-5. 



Native of eastern and southern Mexico. Several notably large trees are 

 known; one of these, the Cypress of Montezuma, was a noted tree four cen- 

 turies ago. A young specimen that is withstanding our winters badly, is in 

 Professor Durand's garden. This specimen has now passed through three 

 winters, and although the tips of the young shoots have been killed by frost, 

 the leaves have retained their persistent character. 



Tribe 4. Cupresseae. 



Leaves and floral parts decussately opposite or ternate, the former scale- 

 like or sometimes subulate. Ovuliferous scales woody or coalescent and 

 fleshy; ovules 2-many to each scale. 

 Cones woody. 



Scales flat or wedge-shaped, imbricate. 



Seeds 4-5 to each scale; branchlets frond-like; leaves with broad scales. 



10. Thuyopsis. 

 Seeds usually 2 (1-3) to each scale. 



Leaves appearing in whorls of 4, flat. 11. Libocedrus. 



Leaves decussately opposite. 12. Thuya. 



Scales peltate. 



Cones maturing the second year; seeds many to each scale. 



13. Cupressus. 



