EVENING-PRIMROSE FAMILY 171 



Rootstocks not turioniferous. 



Plant pallid, glaucous and glabrous almost throughout; montane. 



17. £. glaberrimum. 

 Plant not glaucous, but green or canescent. 



Stems 1-3 dm. tall, simple above, with few pairs of opposite leaves; high montane. 

 Leaves sessile, oblong or linear, suberect; stem slender. 



16. E. oregonense. 

 Leaves more or less distinctly petioled and spreading. 



Plant densely cespitose, stoloniferous; stems sigmoidally bent, 1-1.5 dm. 

 tall; petals purplish to rose-colored, 4—6 mm. long; leaves 1-2 cm. 

 long. 



Capsule linear, slender, 1 mm. or less thick, 2-4 cm. long; seeds smooth, 

 1 mm. long; buds nodding. 18. E. alpinum. 



Capsule subclavate, stouter, 1.5-2 mm. thick, 2-2.5 cm. long; seeds 

 papillose, 1.5-2 mm. long; buds erect. 



19. E. clavatum. 



Plant not so densely cespitose; stems erect, 1-3 dm. tall; leaves 1.5-5 cm. 

 long. 

 Petals purplish, 5-8 (12) mm. long; seeds papillose, 1 mm. long. 



20. E. Hornctnannii. 



Petals white or with pink tips, about 3 mm. long; seeds smooth, 1 mm. 

 long. 21. E. lactiflorum. 



Stems 3-10 dm. tall, usually freely branched, especially above; innovation by rosettes. 

 Petals 2-6 mm. long, white to purplish; stems greenish to light colored, gland- 

 ular to canescent especially above; many of upper leaves alternate. 

 Inflorescence glandular-pubescent. 22. E. adenocaulon. 



Inflorescence whitish-pubescent, not glandular. 23. E. calif ornicutn. 

 Petals 6-10 mm. long, purplish; stems reddish, canescent above; leaves mostly 

 opposite. 24. E. franciscanum. 



1. Epilobium angustifdlium L. Fireweed. Fig. 3359. 



El>ilobium angustifolium L. Sp. PI. 347. 1753. 



Chamaenerion angustifolium Scop. Fl. Carn. ed. 2. 1 : 271. 1772. 



Epilobium spicat urn La.m. Fl. Franc. 3 : 482. 1778. 



Epilobium angustifolium var. pygmaeum Jepson, Fl. Calif. 2: 565. 1936. 



Perennial, with erect, mostly simple and few stems, 0.5-2.5 m. tall, glabrous below, com- 

 monly puberulent above. Leaves alternate, lanceolate to linear-lanceolate, acute, nearly entire, 

 paler below, with lateral veins confluent in submarginal loops, sessile or nearly so, 5-15 (20) cm. 

 long; flowers numerous in long terminal racemes, with small almost linear bracts; pedicels 5-12 

 mm. 'long; hypanthium not prolonged above ovary; sepals lance-linear. 8-12 mm. long, commonly 

 canescent-puberulent throughout, tinged lavender ; petals lilac-purple, rose, or even white, clawed, 

 obovate, 8-18 mm. long; stamens 8, in a single series, often unequal, shorter than the petals; 

 filaments dilated below ; style hairy at base, exceeding stamens ; stigma-lobes slender and elon- 

 gate; capsule 5-7 cm. long; seeds oblong; 1-1.4 mm. long, with long dingy coma. 



In disturbed areas, especially burns, in fairly moist places, Upper Sonoran and Transition Zones; Alaska to 

 southern California east to the Atlantic coast; also Eurasia. A variable species for which many forms and va- 

 rieties have been proposed. Type locality: Europe. July-Sept. 



2. Epilobium latifdlium L. Broad-leaved Willow-herb. Fig. 3360. 



Epilobium tatifolium L. Sp. PI. 347. 1753. 



Chamaenerion latifolium Sweet, Hort. Brit. ed. 2. 198. 1830. 



Stems several from a cespitose rootstock, depressed or arched-ascending, 1-6 dm. tall, gla- 

 brous below, puberulent above. Leaves elliptic-ovate to lanceolate, subopposite, fleshy, glaucous 

 on both surfaces, entire, not veiny, acute, quite sessile, 2-6 cm. long ; racemes short, few-Howered, 

 leafy-bracted ; pedicels 5-10 mm. long; sepals lanceolate, purplish. 13 mm. ong ; petals purple, 

 rose-colored, or even white, purple-veined, rhomboid-obovoid, 1.5-2.5 cm. long; stamens », in 

 one series, about two-thirds the length of the petals; style glabrous, shorter than stamens, 

 stigma-lobes oblong ; capsule canescent, 5-8 cm. long ; seeds fusiform, 2 mm. long. 



Wet places along streams, Arctic Alpine Zone; Arctic America to Mono County, California, east to Colorado; 

 also Eurasia. Type locality: Siberia. July-Sept. 



3. Epilobium obcordatum A. Gray. Rock-fringe. Fig. 3361. 



Epilobium obcordatum A. Gray, Proc. Amer. Acad. 6: 532. 1865. 



Epilobium obcordatum var. puberulum Jepson, Man. Fl. PI. Calif. 669. 1925. 



Stems several from cespitose suffrutescent base, decumbent, 5-15 cm. tall, simple, gjabrous 

 below, usually minutely puberulent at summit, leafy. Leaves opposite usually crowded, glabrous 

 and glaucous, ovate, obscurely and remotely denticulate, 6-10 mm. long, obtuse 'o^rf'.^m LJ 

 short winged petioles; flowers 1 to few, borne singly m uppermost axils; Pe,<^'"ls 2- „ "\"^- /""f •' 

 slender; hypanthium funnelform, 2-4 mm. long; sepals lanceolate, purplish. 9-12 n m lonfe , 

 petals rose-purple, broadly obcordate. 12-20 mm. long; stamens 8. in 2 series ''if^fi'^I'Lous 

 Sne-half, the longer two-thirds the length of the petals ; style purplish, ^.^"^6 Petals glabrou. 

 stigma-lobes short; capsule cylindric-clavate, 2.5-3.5 cm. long; seeds 1.5 mm. long, finely 



^^^ Ri?g« and slopes, Hudsonian and Arctic-Alpine Zones; Cascade Mountains, central Oregon to the Sierra 



