380 CONTEIBUTIONS FROM THE NATIONAL HERBARIUM. 



Stems glabrous below or with minute curled or appressed hairs; leaves mostly 

 glabrous. 



Leaves sessile, glaucous 7. E. platyphyllum. 



Leaves short-petioled, green. 



Petals white 8. E. alplnum. 



Petals purple or pink. 

 Petals 6 to 7 mm. long; plants with scaly underground shoots. 



9. E. hornemannii. 

 Petals 4 to 5 mm. long; plants with short sterile leafy shoots above 

 ground . 



Seeds smooth; capsule long-cylindric 10. E. anagallidifolium. 



Seeds finely roughened; capsule somewhat club-shaped. 



11. E. clavatum. 



1. Epilobium angustifolium L. Fireweed. Abundant at low and middle alti- 

 tudes, chiefly on open slopes, often in woods. Widely distributed in N. Amer., Eur., 

 and Asia. {Chamaenerion angustifolium Scop.; C spicatum S. F. Gray.) — Perennial, 

 glabrous or nearly so; stems simple or branched; leaves lanceolate or linear-lanceolate, 

 5 to 15 cm. long, entire; petal's rose-purple, 1 to 2 cm. long; capsules 5 to 8 cm. long, 

 slender. 



One of the showiest plants of the park, often occurring in great abundance, and 

 continuing in flower for a long time. There is a particularly fine display along the 

 automobile road on the east slope, and the plant is nearly always abundant in burns. 

 The stems, leaves, and capsules are soon brilliantly tinged vdth red and jiurple. The 

 name "fireweed" is due to the fact that the plant is one of the first to spring up in 

 burned-over areas. This, of course, happens because the seeds are easily transported 

 by wind. Fireweed grows in the Eastern States, but there it seldom forms such 

 wonderful displays of color as are found in the West. 



2. Epilobium latifolium L. Alpine fireweed. Common above timber line, on 

 rocky slopes and rock slides; often found abundantly along streams at middle or even 

 at low altitudes. Alaska to Wash., Colo., S. Dak., Que., and Greenl.; also in Eur. 

 and Asia. ( Chamaenerion latifolium Sweet.) — Perennial, 10 to 40 cm. high, often form- 

 ing dense clumps; leaves ovate or lanceolate, entire, 2 to 5 cm. long, covered with 

 fine hairs; flowers crowded at the ends of the stems; petals rose-purple, 1.5 to 3 cm. 

 long; capsule 5 to 8 mm. long. 



A very beautiful plant, but not forming such extensive masses of color as the com- 

 mon fireweed, with which it frequently grows. It reaches its best development along 

 streams at middle elevations, where it often forms great banks of rich color. Plants 

 collected at St. Mary are remarkable for their linear-lanceolate leaves. 



3. Epilobium adenocladon (Hausskn.) Rydb. Occasional at low altitudes on open 

 or brushy slopes or sandljars. Mont, to Colo, and S. Dak. — Stems slender, 20 to 60 

 cm. high, glabrous below, branched; leaves mostly entire, 2 to 4 cm. long; petals 

 pink or purplish, about 5 mm. long; capsule 1.5 to 2.5 cm. long, covered with fine 

 gland-tipped hairs. 



4. Epilobium glandulosum Lehm. Occasional at middle altitudes, on brushy 

 slopes or along brooks. Alaska to Wyo. and Sask. — Stems 30 to 60 cm. high, mostly 

 simple, finely pubescent above; leaves lance-ovate, 3 to 6 cm. long, sessile, finely . 

 toothed; petals purple; capsules 3 to 6 cm. long, finely pubescent. 



5. Epilobium adenocaulon Hausskn. Common at low and middle altitudes, in 

 moist woods or thickets. Yukon to Nev., N. Mex., Pa., and N. B.— Stems 30 to 80 

 cm. high, simple or branched, finely hairy above; leaves lanceolate or ovate, 2 to 6 

 cm. long, usually short-petioled, glabrous or nearly so; petals pink or purple; cap- 

 sules 3 to 5 cm. long, nearly glabrous. 



