TREES AND SHRUBS 77 



Philadclphits argyrocalyx is a species that grows in the 

 timbered mountains, generally among pine timber Attempts 

 to cultivate it on the mesas at the Experiment Station garden 

 proved unsuccessful, because of the extreme summer heat. In 

 partial shade of larger trees it would probably grow even at 

 this level, where supplied with sufficient water. All of the 

 species have rather large white flowers approximately an inch 

 in diameter, that are borne quite profusely, and they all prom- 

 ise to be of value in cultivation. 



HYDRANGEACEAE. Hydrangea Family. 

 Low or tall widely branching shrubs with opposite branches; 

 leaves opposite, exstipulate, simple, more or less persistent, entire or 

 toothed; flowers perfect, with mostly conspicuous white or yellowish 

 petals, solitary or cymose; calyx of 4 or 5 sepals surmounting the 

 hypanthium; stamens numerous, the filaments slender or sometimes 

 stout and appendaged; ovary partly inferior; fruit a woody capsule. 



Flowers in conspicuous cymes of numerous 

 flowers; sepals and petals 5; stamens 10. 

 Plants large, often 6 feet high; leaves large 



toothed. 1. Edwinia. 



Plants small, depressed; leaves small, entire. 2. Fenpt.erella. 



Flowers solitary or in 2- or 3-flowered clus- 

 ters; sepals and petals 4 or 5, usually 4; 

 stamens 8 or more numerous, 15 to 60. 

 Filaments appendaged; flowers uniformly 



4-parted; stamens 8. 3. Fendlera. ' r 



Filaments not appendaged; flowers occasion- 

 ally 5-parted; stamens 15 to 60. 4. Philadelphia. 



I. EDWINIA Heller. 



A rather large shrub often 6 feet high, with opposite 

 branches and brownish partly deciduous bark; leaves deciduous, 

 thin, ovate, petiolate, serrate. */2 inch long or less, bright green above, 

 pale or whitish tomentulose beneath; flowers in crowded cymes, 

 white, 5-parted. 



A single species of the timbered mountains of 



the Transition and Canadian Zones. 1. E. americana. 3, 



