54 KEY TO THE SPECIES 



6. CHYLISMA (Primrose) 



Mostly small erect annuals, leafy at base and scapose (sometimes branched) 

 stemmed ; flowers small, witli obovate petals and cylindrical capsules borne on 

 slender pedicels. 



1. Chylisma scapoidea (Nutt.) Small (Scapose Primrose). Nearly glabrous, 

 from 1-3 dm. high, stem and branches slender ; leaves ovate-oblong, somewhat 

 pinnatifid ; capsules 10-S5 mm. long, obtuse at apex, acute at base. On steep 

 banks, R. R. grades, etc. 



7. ANOGRA (Evening Primrose) 



Annual or perennial branched, canescent herbs, with white and often shreddy 

 bark, white flowers, elongated colyx-tube, long capsule and numerous ovules 

 in 1 row. 



1. Anogra coronopifolia (T. and G.) Britt. (Cut-leaved Evening Primrose). 

 A low branched perennial with deeply pinnatifid leaves, white flowers, petals 

 broadly obovate and oblong capsule constricted at top ; seeds tuberculate. Sandy 

 plains. 



2. Anogra pallida (Lindl.) Britt. (White-stemmed Evening Primrose). 

 Perennial ; the stems more or less branched, glabrous or nearly so, becoming 

 white and glistening with shreddy bark ; 3-7 dm. high, leaves linear, entire or 

 remotely denticulate ; flowers axillary ; the corolla white, turning pink, about 

 4 cm. broad ; capsule linear curved. 



8. PACHYLOPHUS (Primrose) 



Stemless perennials with rosulate entire or pinnatifld leaves, basal flowers and 

 capsules ; the seeds smooth, a deep furrow along the raphae. 



1. Fachylophus csespitosus (Nutt.) Raimann (Tufted Primrose). Leaves 

 oval to lanceolate, deeply sinuate-dentate, tapering into slender petioles, usually 

 densely pubescent, forming with the few large flowers a compact tuft on the 

 crown; calyx pubescent, its tube 6-10 cm. long, with dilated mouth; corolla 

 white, changing to rose, 7-9 cm. broad ; capsule strictly basal and sessile, tubercu- 

 late. Stony mountain sides. 



2. Pachylophus montanus (Nutt.) Aven Nelson (Desert Primrose). 

 Smaller, the leaves only 3-5 cm. long, nearly entire, rather thick, sparingly pubes- 

 cent on the faces, white-hirsute on the margins and midrib ; calyx-tube about as 

 long as the leaves, pubescent ; the lobes pinkish, nearly glabrous ; corolla 4-6 cm. 

 broad, the petals broadly obcordate, changing to pink ; capsule small and scarcely 

 tubercled- 



9. LAVAUXIA (Primrose) 



Quite similar to Pachylophus ; flowers white or yellow ; the capsule acutely 

 angled or winged. 



1. Liavauxia bracHycarpa (Gray) Britt. (Gaudt Primrose). Whitish, with 

 a soft pubescence: leaves thick from entire to pinnatifid, narrowly ovate to lanceo- 

 late, petioled ; flowers yellow, large, 6-8 cm. broad; capsule oblong, corky, wrinkled 

 on the faces. 



2. Lavauxia triloba (Nutt.) Spach. Nearly smooth, almost stemless, with 

 leaves and flowers clustered ; leaves 1-2 dm. long, long-petioled. oblanceolate, 

 pinnatifld or toothed ; flowers white or rose-colored ; calyx-tube slender, 5-8 cm. 

 long; petals 15-25 mm. long; pod ovate, 15-25 mm. long, strongly winged and 

 veiny. Plains. 



