COULTER AND ROSE—NORTH AMERICAN UMBELLIFERAF, 171 
The species of Plery.cia are very difficult of discrimination, and much of the mate- 
rial we have cited in connection with the types is in no condition to determine 
accurately. There remains in herbaria considerable material which we have not 
attempted to refer, as it will need to be elucidated by further collections and field 
observations. 
Flowers vellow. 
Leaves with pale, narrow, and rigid segments. ..-..----------- 1. P. terebinthina, 
Leaves with segments greener and not so rigid. 
Leaves of broad outline. 
Low (1 to 3dm.). 
Dorsal ribs with broad wings ..-...--.----------+------ 2. P foeniculacea, 
Dorsal ribs with narrow wings ...-.--------------------- 3. P. thapsoides. 
Taller (4 dm. or more) and stouter .....------------------ 1, P. californica, 
Leaves of narrower outline. 
Pinnae small and distant ........--.-.------------------------ 5, P. petraea. 
Pinnae larger and more crowded -....-------------------+---- 6. BP. calearea. 
Flowers white .......--------------------- +--+ 2-22 --eerrcrrcree 7. P. albiflora. 
1. Pteryxia terebinthina (Hook.) C. & R. Fig. 51. 
Selinum terebinthinum Hook. Fl. Bor, Am. 1: 266. pl. 95. 1854. 
Cymoplerus terebinthinus Torr. & Gray Bl. 1: 624. 1840. 
Pteryxia terebinthacea Nutt. in Torr, & Gray Flo lee. 
Peduncles elongated, reaching + dm., considerably exceeding the 
leaves; leaves with ultimate segments pale, rigid, small and narrow, 
acute and mucronate, entire or toothed; umbels with unequal rays, 
no involucre, and involucels of linear acuminate bractlets; rays L to 
4.5 em. long; fruiting pedicels 4 to 7 mm. long: flowers yellow; fruit 
broadly oblong to nearly orbicular, about 5 mm. long, sach carpel 
with 83 to 5 broad thin undulate crisped wings; oil tubes very small, 
4 to 8 in the intervals, 8 to 12 on the commissural side; seed face with 
broad and shallow concavity. 
Type locality, ‘Sandy grounds of the Wallawallah River, North- 
West coast of America,” eastern Washington; collected by Douglas. 
Dry ground, eastern Oregon and Washington, at the lower levels. 
Specimens examined: 
Oregon: John Day River, //omel/, June, 1880. 
Wasntxarox: Walla Walla region (type locality), Nuttall; loose volcanic soil, 
Faleon Valley, Suksdorf, June-July, 1883; Mount Adams, altitude 1,200 to 
1,500 meters, Suksdorf 1201, Angust 10, 1885; dry ground, Yakima County 
(Prosser and Mount Adams) and Franklin County (Pasco), [Henderson 380, 
May-August, 1892; Sundberg & Letherg 280, in 1893. 
9, Pteryxia foeniculacea Nutt. in Torr. & Gray Fl 1: 624. 1840. 
Cymopterus focniculaceus Torr. & Gray, le. 
Resembling 7? ferchinthing, but not so robust, and lower, I to 6 dm. 
high; leaves greener, more finely dissected, and less rigid, the seg- 
ments narrower and longer; fruit (not seen) said to be as in 2. tere- 
hinthina, but the wines not undulate or scarcely so. 
Type locality, “on rocks, Blue Mountains of Oregon;” collected by 
Nuttall; type in Herb, Philad. Acad. 
