300 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



3. Fendlera rupicola A. Gray, PI. Wright. 1: 77. 1852. 



Type locality : ' ' On perpendicular rocks of t he < ruadalupej above New Braunfels," 

 Texas. 



Range: Arizona to western Texas and southward. 



New Mexico: Magdalena Mountains; Sandia Mountains; Burro Mountains; Ani- 

 mas Mountains; Big Hatchet Mountains; Florida Mountains; Organ Mountains; Gray. 

 Dry hills, in the Upper Sonoran Zone. 



A beautiful shrub, occurring in the drier mountains of the State, among rocks. It 

 has never been cultivated, so far as we can learn, but it is certainly as handsome as the 

 commonly grown species of Philadelphus. 



4. PHILADELPHUS L. Mock orange. 



Freely branching shrubs 2.5 meters high or less, mostly with conspicuous white 

 flowers; leaves small, 2 cm. long or less, elliptic-lanceolate to ovate; flowers on short 

 pedicels, mostly solitary; sepals and petals 4, rarely 5; stamens numerous, 15 to 60; 

 ovary about two-thirds inferior. 



KEY TO THE SPECIES. 



Petals acute, ochroleucous; stamens about 15 1 . P. mearnsii. 



Petals rounded at the apex, white; stamens 25 to 60. 



Hypanthium externally glabrous to strigose 2. P. m icrophyllug. 



Hypanthium densely pubescent, silvery white. 



Leaves hirsute beneath, the pubescence loose, the blades 



20 to 35 mm. long 3. P. urgyrocalyx. 



Leaves silky-strigose beneath, the pubescence close and 



dense, the blades 10 to 15 mm. long 4. P. argenteus. 



1. Philadelphus mearnsii W. H. Evans; Rydb. N. Amer. Fl. 22: 174. 1905. 

 Type locality: Near the Upper Corner Monument, Grant County, New Mexico. 



Type collected by E. A. Mearns (no. 36). 

 Range: Known only from the type locality. 



2. Philadelphus microphyllus A. Gray, Mem. Amer. Acad. n. ser. 4: 54. 1849. 

 Type locality: Santa Fe Creek, on sunny and steep sides of the mountains, 



between rocks, 11 miles above Santa Fe, New Mexico. Type collected by Fendler 

 (no. 266). 



Range: Southern Colorado to Arizona and New Mexico. 



New Mexico: Carrizo Mountains; Santa Fe Mountains; Sandia Mountains; moun- 

 tains west of Grants Station; Magdalena Mountains; Hillsboro Peak; San Mateo Moun- 

 tains. Open slopes, in the Transition Zone. 



This species and the next two should do well in cultivation at levels of 1,500 meters 

 or more, in open porous soils, if supplied with sufficient water. 



3. Philadelphus argyrocalyx Wooton, Bull. Torrey Club 25: 452. 1898. 

 Philadelphus ellipticus Rydb. N. Amer. Fl. 22: 174. 1905. 



Type locality: On Eagle Creek, in the White Mountains, New Mexico. Type 

 collected by Wooton (no. 524). 



Range: White and Sacramento mountains of New Mexico, in the Transition Zone. 



There seems to be no essential difference between the types of P. argyrocalyx and 

 P. ellipticus. The type of the latter bears on its label the legend "Mesilla Park." 

 This certainly is wrong, for no Philadelphus is found nearer Mesilla Park than in the 

 Organ Mountains 10 or 12 miles away. No such plant as is represented by the type of 

 P. ellipticus has ever been found in the Organs by either of the writers. However, 

 the type of Dr. Rydberg's species exactly matches a specimen collected by Wooton on 

 Ruidoso ( 'reek in the White Mountains, June 30, 1895. Comparing the two specimens 



