UMBKLIylFBttAIfi (PAKSNIP FAMILY) 357 



often appearing sessile, somewhat elongated in fruit: involucre inconspicuous, 

 hyaline, and jobed, sometimes reduced to a cup; involucels conspicuous, the 

 bractlets distinct, obovate, entire, with very broad, white, and hyaline margins, 

 ^ith more or less distinct green central region: pedicels shorter thatx the 

 bractlets: flowers white, sometimes purplish: fruit broadly oblong to nearly 

 orbicular, 6-8 mm. long, with broad, thin wings somewhat thickened at in- 

 sertipn; oil-tubes 1-3 in the intervals, 4^8 on the commissural side:,seed some- 

 wfiat flattened, with broadly concave face. Cymopterus montoraiw.— -Kansas 

 to Dakota and west to Colorado and Wyoming. ..; ici*/ 



2. Phellopterus bulbosus (A. Nels.) C. & R. Contrib. Nat; Herb. 7;: 168. 

 1900. Leaf^segments more crowded than in P. mqntarMs: flowering umbel 

 fnore elongated, in fruit equaling or exceeding the leaves;- involucre con- 

 spicuous, of broad hyaline bracts united at base; involucels .more conspic- 

 uous, the broad hyaline bracts sometimes with a greenish central i region;. 

 pedicels longer than in P. montanus; flowers purplish: fruit oblong, rmUch. 

 narrower than in P. montanvs, 8 mm. long, with broad thin wings not thicks' 

 ened at insertion; oil-tubes 3-5 in the.,inteEvals, 6-10 on the commissural 

 side: seed face with rather deep and broad concavity. — Green river region 

 of Wyoming. ^ ^•. ,.■; 



3. Phellopterus purpurascens (Gray) 0. & R. I. o. Pedimcles: longer than 

 in P. montanus, in fruit equaling or exceeding the leaves; umbels more or less 



■ Compacted; involucre conspicuous, composed of white or pUrpUsh hyaUne' 

 biEicts which have 1-3 green or purphsh nerves and are united at base,' or 

 sometimes reduced to a hyaline sheath; involucels resembling the in-vnolucres: 

 flowers purple: fruit orbicular, with, broad ^ings aod, oblong body lQ-12 mm. 

 loig: carpels' somewhat flattened, with 5 broad, thin wings scarcely thictened 

 at insertion,; oil-tubes 2 or 3 in the intervals, 4 on the commissural side: see^; 

 somewhat flattened, with broadly concave face. — Mostly west of our range. 

 :3a. Phellopterus ptirpurascens East'^oodiae (Jones) C. & R. 1. c. ,169, 

 More robust, 2-3 dm. high, with usually long peduncles: um,b6ls a,nd umbel-, 

 lets more open, with prominent rays and pedicels:' wings of fruit' iiiuch nar- 

 rower, resulting in a narrow fruit. — More eastern in range; central and western 

 Colorado. i ."-{t: -i a ^.i 



4. Phellopterus multinervatus C. & R. 1. c. Peduncles as in P. ■purjmras- 

 cens; involucre a low, hyaline more or less lobed sheath, or developing one or 

 more conspicuous bracts resembling those of the involucel; involucels con- 

 spicuous, composed of broad purplish bractlets united at base, which are 

 rounded at apex, many-nerved, and with narrow hyaline margins; flowers 



fmrple: fruit orbicular, with very broad wings and oblong body, 12-15 inm. ' 

 ong: carpels somewhat, flattened, with 5 broad thin wings more or! less thick- 

 ened at insertion; oil-tubes 2-4 in the intervals, 8 'on the condmissural side: 

 seed somewhat flattened, with broadly concave face. (P. camporum Bydb. 

 Bull. Torr. Bot. Club 31: 574. 1904.)^^plorado and New Mexico and west 

 to Utah and Arizona. 



19; PTER YXI A Nutt^ 



Plants of acaulescent habit or nearly so, and clothed at base with persist- 

 ent leaf'^heaths, leaves clustered at base with main divisions ternate 'then 

 pinnately finely c^isseoted into short-linear more or less pungent segments, 

 mostly no involucre, involucels of narrow bractlets (not at all hyaline), and 

 yellow flowers. Calyx-teeth evident. Fruit oblong to orbicular in outline, 

 glabrous. Carpel usually stropgly flattened dprsally, with, wings thin through- 

 out, lateral ribs with ,brpad wings,,, dorsal and intermediates from strongly 

 ribbed to broadly winged; stylopodium wanting; oil-tubes several in the in- 

 tervals. Seed face plane or witli a shallow and broad concavity. — Cymopterus 

 in part. , 



Flowets yellow; fruit oblong 1. P. calcarea. 



Flowers white; fruit orbicular , . 2. F. albiSoia, 



1. Pteryzia calcarea (Jones) C. & R. 1. c. 173. Sho^ caulescent, giving 



