HYDRANGEA FAMILY 



385 



hairy on the veins beneath and in the forks of the principal veins near the base ; flower clusters 

 racemose; petals elliptic to oval, 10-15 mm. long; styles united half to two-thirds the way. 



Hillsides and canyons, Arid Transition Zone; British Columbia east of the Cascade Mountains to eastern 

 Oregon, eastward to central Montana. Type locality: Clark's Fork of the Columbia River, Montana. May-July. 



3. Philadelphia californicus Benth. California Syringa. Fig. 2305. 



Philadelphus californicus Benth. PI. Hartw. 309. 1849. 



Philadelphus Lewisii var. californicus A. Gray, Bot. Calif. 1 : 202. 1876. 



Philadelphus Fremontii Rydb. N. Amer. Fl. 22: 165. 1905. 



Deciduous shrub, 1.5-3 m. high, with ascending branches. Leaves ovate or ovate-lanceolate, 

 3-6 cm. long, acute at apex and base, entire or inconspicuously denticulate ; flower clusters race- 

 mose, 7-20- flowered; petals oval to obovate, 10-12 mm. long; styles united up to the base of 

 the stigmas. 



Hillsides and canyons, mainly Arid Transition Zone; Siskiyou Mountains, southern Oregon, to the central 

 Sierra Nevada, California. Type locality: western slopes of the Sierra Nevada, probably along the American 

 River or in Butte County, California. May-July. 



4. Philadelphus serpyllifolius A. Gray. Desert Syringa. Fig. 2306. 



Philadelphus serpyllifolius A. Gray, PI. Wright. 1 : 77. 1852. 

 Philadelphus stramineus Rydb. N. Amer. Fl. 22: 172. 1905. 

 Philadelphus pumilus Rydb. N. Amer. Fl. 22: 173. 1905. 



Deciduous shrub, 6-10 dm. high, with numerous short subspinose branches, the bark pale 

 gray or stramineous. Leaves narrowly ovate to elliptic or elliptic-lanceolate, 8-15 mm. long, 

 strigose-hirsute above, densely white-tomentulose and strigose beneath, mainly 1-nerved, the 

 lateral veins obscure; flowers mostly solitary, on the ends of short divergent branches; calyx 



2297. Heuchera cylindrica 



2298. Heuchera ovalifolia 



2299. Heuchera chlorantha 



2300. Heuchera glabella 



2301. Heuchera tenuifolia 



2302. Heuchera Duranii 



