274 



UMBELLIFERAE 



small linear, often pungent, divisions. Involucre none ; involucels of narrow herbaceous 

 bractlets. Flowers yellow or rarely white or purple ; sepals prominent. Fruit narrowly 

 oblong- to ovoid, flattened dorsally ; lateral ribs winged, thin, some or all of the dorsal 

 similarly winged. Stylopodium none. Oil-tubes 1 to several in the intervals, several on 

 the commissure. Seed-face plane or shallowly concave. [Name from the two Greek 

 words, Pteris, meaning fern, and ixia, the chameleon plant.] 



A genus of 5 species, natives of western North America. Type species, Selinum tercbinthinum Hook. 



Leaves ovate to ovate-long, pinnately or ternate-pinnately decompound. 

 Leaves narrowly oblong, ternate-pinnate or 2-3-pinnate. 



1. P. terebinthina. 



2. P. petraea. 



1. Pteryxia terebinthina (Hook.) Coult, & Rose. Terebinth Pteryxia. Fig. 3618. 



Selinum terebinthinum Hook. Fl. Bor. Amer. 1:266. pi. 95. 18.^2. 

 Pteryxia terbinthina Coult. & Rose, Contr. U.S. Nat. Herb. 7: 17L 1900. 



Plants short-stemmed, 1-6 dm. high. Leaves coriaceous, ovate-oblong to broadly ovate, 

 3-18 cm. long, 3-12 cm. broad, pinnately or ternate-pinnately decompound, the ultimate divisions 

 linear to subcuneate, 1-4 mm. long, acute and mucronulate, more or less confluent; peduncles 

 stout, exceeding the leaves; involucre usually none; rays 7-24, unequal, 0.5-7 cm. long; bract- 

 lets linear to rarely obovate, about equaling the flowers; fruit ovoid to ovoid-oblong, 7-11 mm. 

 long; lateral wings thin, usually undulate-crisped, the dorsal similar. 



Dry, usually sandy or gravelly soils, Upper Sonoran and Arid Transition Zones; Yakima and Franklin 

 Counties, eastern Washington, to the John Day Valley, eastern Oregon. Type locality: "on the sandy grounds 

 of the Wallawallah River." May-July. 



Pteryxia terebinthina var. foeniculacea (Torr. & Gray) Mathias, Ann. Mo. Bot. Card. 17: 332. 1930. 

 {Cymopterus foeniculaceus Torr. & Gray, Fl. N. Amer. 1: 624. 1840; Cymopterus thapsioidcs Nutt. op. cit. 625.) 

 Leaves greener and less rigid; umbels compact; fruit 5-10 mm. long, 3-4 mm. broad; wings plane. Sherrnan 

 County, eastern Washington, to Deschutes County, Oregon, east to Idaho, Montana, and Utah. Type locality: 

 "on rocks, Blue Mountains of Oregon." 



Pteryxia terebinthina var. californica (Coult. & Rose.) Mathias, op. cit. 337. {.Pteryxia calif ornica Coult. 

 & Rose, Contr. U.S. Nat. Herb. 7: 172. 1900.) Leaves gray-green, the divisions a little broader and less 

 rigid than the typical species; rays slightly longer; fruit 5-10 mm. long, wings little or not at all undulate- 

 crisped. Arid Transition and Canadian Zones; Siskiyou Mountains to central California in the Coast Ranges 

 and Sierra Nevada. Type locality: Sisson, Siskiyou County, California. 



2. Pteryxia petraea (M. E. Jones) Coult. & Rose. Rock Pteryxia. Fig. 3619. 



Cymopterus petraeus M. E. Jones, Contr. West. Bot. No. 8: 32. 1898. 

 Pteryxia petraea Coult. & Rose, Contr. U.S. Nat. Herb. 7: 172. 1900. 



Herbaceous stems slender, usually several from the crown of the elongate woody taproot, 

 1.5-4.5 dm. high. Leaves pale green, narrowly oblong in outline, 3.5-17 cm. long, ternate- 

 bipinnate to 3-pinnate, the main divisions distant; ultimate divisions linear, 1-8 mm. long, 0.5-1 

 mm. broad ; peduncles exceeding the leaves ; rays 3-7, unequal, the outer 3-5 cm. long, the inner 

 much reduced; bractlets linear, 1-3 mm. long; fruit ovoid to ovoid-oblong, 4. ,5-7 mrn. long; 

 lateral wings narrower than to equaling the width of the body, 1-3 of the dorsal ribs similarly 

 winged; oil-tubes usually 3 in the intervals, 5-15 on the commissure. 



Rockv cliffs or canyon walls. Arid Transition and Canadian Zones; Alvord Desert and Steins Mountains, 

 eastern Oregon, and Inyo and White Mountains, California, east to Idaho and Nevada. Type locality: 

 Palisade, Nevada. June-July. 



3612 

 3612. Angelica Canbyi 



3613 

 3613. Angelica genuflexa 



3614 

 3614. Angelica arguta 



