78 TREES AND Mil; 



2. FENDLERELLA Heller. 



A ,ow mudl '"■ &*nb l l A to 2 feet high, with grayish 



young branches, small lanceolate leaves 1 cm. long or less; flowers 



small, about % inch long, white, in eym veral-flowered clusters; 



hypanthium decidedly turbinate; capsule considerably exceeding the 



calyx. 6 



A single species of the drier mountains. 1. f. utahensis. 



3. FENDLERA Engelm & Gray. 



A shrub (i feel high or less, with grayish bark, rather small 

 leaves, and beautiful pink-tinged white flowers ently borne in 



great profusion; leaves entire, mostly sessile; flowers 4-parted: fila- 

 ments of tli,. 8 stamens flattened and with 2 narrow appendages at 

 the top extending beyond the anther. 



A single species of the dtier mountains in the 



Upper Sonoran Zone. ,. F rupicola. 



4. PHILADELPHUS I. Mock Orange. 



Freely branching shrub - high cm- less, mostly with 



conspicuous white flowers mostly small, :i i inch 



elliptic-lanceolate to ovate: flowers on short pedicels, mostly soli- 

 tar > ; and petals 4. rarely 5, stamens numerous. 15 to 60; 



ovary about two thirds inferior. 



Petals acute; ochroleucous; stamens about 15. l. />. rnear 

 Petals rounded at the apex, white: stamens 

 to 60. 



Hypanthium externally glabrous to strigose. 2. P. microphallus. 

 Hypanthium densely pubescent, silvery white. 

 Leaves t to 1 • , jncl hirsute be- 



neath, the p 



Leaves ', to i.._. inch long, Bilk! l>e- 



hescence 4 P argenteus. 



