PIPER FLORA OF THE STATE OF WASHINGTON. 291 



Specimens examined: lloquiam, Lamb 1026; Clallam County, Elmer 2692; Whidby 

 Island, Gardner 24; Seattle, Piper 546; Tacoma, Flett 76; San Juan Island, Lyall in 1858; 

 Goat Mountains, Allen, August 23, 1895; without locality. Cooper. 



Zonal distribution: Humid Transition. 



The following specimens seem to me ambiguous between C oligosperma and C. pennsyl- 

 vanica and I am unable to refer them elsewhere: Seattle, Piper 732; Tacoma, Flett, April 

 20, 1896; west Klickitat County, Suksdorf 505, 504; Skokomish River, Piper 2182; Kin- 

 caid; Pend Oreille River, Lyall in 1861; Waitsburg, Horner 588, 79; Wawawai, Elmer. 



PARRYA. 



1. Parrya menziesii (Hook.) Greene, Fl. Fran. 253. 1891. 



Phoenicaulis menziesii Greene, Bull. Torr. Club. 13: 143. 1886. 



Hesperis menziesii Hook. Fl. Bor. Am. 1 : 60. 1830. 



Phoenicaulis cheiranthoides Nutt. ; Torr. & Gr. Fl. 1 : 89. 1838. 



Type locality: California. Collected by Menzies. 



Range: Washington to California and Nevada. 



Specimens examined: EUensburg, Piper 2712; Kittitas Valley, W kited 68; Blue 

 Mountains, Piper 2414. 



Zonal distribution : Arid Transition. 



la. Parrya menziesii lanugfinosa S. Wats, in Gray, Syn. Fl. 1^: 152. 1895. 



Type locality: "Lower Columbia Valley, east of the Cascades, Douglas, Suksdorf." 



Range: Washington to California. 



Specimens examined: Columbia River, Douglas in 1830; between Klickitat Valley and 

 Columbia River, Suksdorf 236; east side Columbia below the Chelan, Watson 28; near Gol- 

 dendale, Howell 43; Wenache, W kited 1019; North Yakima, Mrs. Steinweg in 1894; Crab 

 Creek, Sandberg & Leiberg 242; without locality, Vasey in 1889; Klickitat Hills, Gorman, 

 April, 1895; Rattlesnake Mountains, Cotton 551. 



Zonal distribution: Arid Transition. 



ARAB IS. Rock cress. 

 Seeds wingless; flowers white. 



Radical leaves pinnately cleft into short and broad segments . . 1. A. lyrata occidentalis. 

 Radical leaves entire. 



Cauline leaves not auriculate. 



Herbage wholly stellate-pubescent 2. A. wkitedii. 



Herbage glabrous above, pubescent below with sim- 

 ple or forked hairs 3. A. nuttallii. 



Cauline leaves auriculate; plant glaucous, glabrous 



except near the base 4. A. glabra. 



Seeds winged or wing-margined. 

 Seeds arranged in a single row. 



Cauline leaves sessile not cordate or auricled 5. A.furcata. 



Cauline leaves cordate or auriculate at base 6.-4. hirsuta. 



Seeds more or less distinctly in two rows. 



Cauline leaves not at all auriculate at base; leaves all 



entire, villous-hirsute 18.-4. cusickii. 



Cauline leaves auriculate or cordate. 

 Radical leaves dentate. 



Pods reflexed, usually straight; whole plant 



finely stellate-pubescent 7. A. holboellii. 



Pods arcuate, spreading. 



Flowers dark-purple; basal leaves some- 

 what pubescent, the upper glabrous and 

 glaucous 8. .4. atrorubens. 



