164 EVENING PRIMROSE FAMILY 



A. Flowers large, showy; petals y 2 in. or more long". 



Petals entire; stems 1 to 3 ft. high 1. E. angustifolium. 



Petals deeply lobed; stems short 2. E. obcor datum. 



B. Flowers small; petals less than ' 4 in. long-. 



Slender annuals. 



Leaves 1 in. or less long 3. E. minutum. 



Leaves 1 or 2 in. long 4. E. paniculatum. 



Perennials. 



Leaves small, mostly Y\ in. or less long. 



Herbage nearly glabrous 10. E. oregonense. 



Herbage crisp-hairy 7. E. ursinum. 



Leaves larger, mostly J4 to 2 or 3 in. long. 



Glabrous throughout; leaves narrowly lanceolate.. 8. E. glaberrimum. 

 Glabrous below; minutely hairy above. 



Leaves all strictly sessile 6. E. brevistylum. 



Leaves short-petioled. 



Leaves thickish, 2 or 3 in. long 5. E. adenocaulon. 



Leaves very thin, 54 to 2 in. long 9. E. alpinum. 



1. E. angustifolium L. Fire-weed. Herbage finely ashy- 

 pubescent above, otherwise glabrous. Leaves alternate, lance- 

 olate, nearly entire, 3 to 6 in. long. Flowers many, large, 

 purplish lilac, in long racemes. Petals about l / 2 in. long, 

 entire. {E. spicatum Lam. — Chamaenerion angustifolium Scop.) 



The tall, leafy stems of the Fire-weed are terminated by 

 the long, brilliant spikes of purple flowers. It is a highly 

 decorative plant of meadows and stream banks and has a 

 wide distribution. 



Epilobium angustifolium Epilobium obcordatum 



2. E. obcordatum Gray. Rock-fringe. Herbage glabrous 

 and pale except the glandular-pubescent upper parts. Leaves 

 all opposite, broadly ovate, nearly entire, J4 to Va m - long, 



