382 MISC. PUBLICATION 42 3, IT. S. DEPT. OF AGRICULTURE 



cleft or divided blades; flowers few, rather showy, in a narrow raceme; 

 petals white or pink, clawed, deeply cleft; stamens 10, not exserted. 



1. Lithophragma tenella Nutt. ex Torr. and Gray, Fl. North Amer. 



1:584. 1840. 



Coconino and Gila Counties, 5,000 to 8,000 feet, pine forests, May 

 to June. Alberta to New Mexico, north-central Arizona, and Cali- 

 fornia. 



A very attractive little plant. The Arizona specimens have been 

 referred to L. australis Rydb. and L. breviloba Rydb., but the writers 

 have been unable to discover satisfactory characters for distinguish- 

 ing these forms, even as varieties, from L. tenella. 



4. PARNASSIA. Grass-of-parnassus 



Plant herbaceous, perennial, with a short rootstock; leaves in a 

 basal rosette and a single one borne on the scape (usually below the 

 middle), the blades entire, several-veined from near the base; petals 

 oval, conspicuously veined, 6 to 10 mm. long; staminodia 5 to 7 in 

 the cluster, united below. 



The popular name is misleading, as these plants are not at all 

 grasslike. 



1. Parnassia parviflora DC, Prodr. 1: 320. 1824. 



Near Greer, Apache County, 8,800 feet (Eggleston 17098), in wet 

 meadows, August. Canada to New Mexico and eastern Arizona. 



5. PHILADELPHUS. Mockorange 



Shrubs with branching stems and exfoliating bark; leaves opposite, 

 the blades thickish, entire or dentate, white-sericeous beneath; 

 flowers solitary or very few in the cluster, rather large and showy; 

 petals white, broad and rounded; stamens numerous; ovary partly 

 inferior. 



The Old World P. coronarius L., and other species are favorite 

 ornamental shrubs, often known by the inappropriate name "syringa." 

 P. lewisii is the State flower of Idaho. 



1. Philadelphia microphyllus A. Gray, Amer. Acad. Arts and Sci. 

 Mem.,ser. 2,4: 54. 1849. 



Apache County to Coconino County, south to Cochise, Santa 

 Cruz, and Pima Counties, 5,000 to 8,000 feet, rocky slopes and canyons 

 in the chaparral and yellow pine belts, June and July. Southern 

 Colorado, New Mexico, Arizona, and California. 



The Mexican bighorn or "mountain sheep" is reported to browse 

 these plants. Occurring in most parts of the range of the species in 

 Arizona is var. argenteus (Rydb.) Kearney and Peebles (P. argenteus 

 Rydb.), which has the upper leaf surface and hypanthium sericeous 

 (these merely strigose, or glabrate, in the typical form). 



6. JAMESIA. Cliffbush 



Shrub, often 2 m. or more high, with shreddy bark; leaves with 

 large, thin, ovate, crenate blades, these bright green above, whitish 

 pubescent beneath; flowers numerous, rather small, in dense cymes; 

 petals white or pink; filaments broad and flat, not lobed; styles 3 to 5. 



