EVENING-PRIMROSE FAMILY 177 



Boggy places, upper Transition and Hudsonian Zones; in the mountains from British Columbia to southern 

 California, Idaho, and Nevada. Type locality: Oregon. July-Aug. 



17. Epilobium glaberrimum Barbey, Glaucous Willow-herb. Fig. 3375. 



Epilohium glaberrimum Barbey, Bot. Calif. 1 : 220. 1876. 



Epilobium pruinosum Hausskn. Mon. Epilob. 252. pi. 15. 1884. 



Epilobium fastigiatum subsp. glaberrimum Piper, Contr. U.S. Nat. Herb. 11: 404. 1906. 



Perennial, with several stems from branching scaly rootstocks ; stems simple or nearly so, 

 slender, erect from somewhat decumbent base, glabrous and glaucous, sometimes slightly glandu- 

 lar-puberulent above, often purplish, 3-6 dm. tall. Leaves pallid, glabrous, glaucous, ascending, 

 oblong-lanceolate, obtuse, entire or minutely denticulate, sessile, 2-5 cm. long, gradually reduced 

 up the stem ; flowers erect or somewhat drooping ; fruiting pedicels 1—2 cm. long ; sepals 1-2 mm. 

 long ; petals 4-7 mm. long, purplish to almost white ; capsule 4-7 cm. long, slender, suberect; seeds 

 papillate, about 1 mm. long, not beaked, with whitish coma. 



Stream banks and wet places, upper Transition and Hudsonian Zones; Washington to southern California, 

 Idaho, and Nevada. Type locality; Yosemite Valley, California. July-Aug. 



Epilobium glaberrimum var. fastigiatum (Nutt.) Trelease, Rep. Mo. Bot. Card. 2: lOS. pi. 39. 1891. 

 (Epilobium affinc var. fastiaiatum Nutt. in Torr. & Gray, Fl. N. Amer. 1:489. 1840; E. glaberrimum var. 

 latifolium Barbey, Bot. Calif. 1: 220. 1876; £. atrichum Levi. Rep. Nov. Spec. 7: 99. 1909; E. platyphyllum 

 Rydb. Bull. Torrey Club 40: 63. 1913.) Lower, 1-3 dm. tall. Leaves broader, shorter, ovate, 1.5-2.5 cm. 

 long, more crowded. In similar situations to the species, from British Columbia to central California and Utah. 

 Type locality: "Plains of the Oregon." 



Epilobium oreganum Greene, Pittonia 1 : 225. 1888. (Epilobium subcaesium Greene, Pittonia 2: 295. 1892.) 

 An uncertain species of which more material is needed to decide whether or not it is only a large-flowered form of 

 E. glaberrimum, from which it differs chiefly in having larger flowers with purplish petals 8-12 mm. long. 

 Springy places. Grants Pass, Oregon, the type locality. 



18. Epilobium alpinum L. Alpine Willow-herb. Fig. 3376. 



Epilobium alpinum L. Sp. PI. 348. 1753. 

 Epilobium anagallidifolium Lam. Diet. 2: 376. 1786. 



Densely cespitose perennial, stoloniferous ; stems numerous, simple, erect, slender, sigmoid- 

 ally bent, nodding at apex, about 1 dm. tall, glabrous, or with pubescent lines, often purplish 

 above. Leaves rather uniformly distributed, divergent, oblong-ovate to -lanceolate, obtuse, entire, 

 or nearly so, 1-2 cm. long, on short petioles ; inflorescence nodding in bud, purplish, 1- to few- 

 flowered, somewhat crisp-pubescent or even glandular; fruiting pedicels 5-15 mm. long; sepals 

 2 mm. long; petals lilac to purple, 4-5 mm. long; capsule slender, linear, about 1 mm. thick, 

 purplish, 2-4 cm. long ; seeds smooth, obovoid, broad, 1 mm. long, with dingy coma. 



Moist rockslides and stony places, Arctic-Alpine Zone; occasional, Alaska to central California, Colorado, and 

 Labrador, Eurasia. Type locality : Europe. July-Sept. 



19. Epilobium clavatum Trelease. Clavate-fruited Willow-herb. Fig. ZZ77 . 



Epilobium clavatum Trelease, Rep. Mo. Bot. Card. 2: 111. pi. 48. 1891. 



Habit much as in preceding species ; stems 5-15 cm. tall, purplish, subglabrous to glandular- 

 pubescent. Leaves broadly ovate, obtuse, divergent, 1-2 cm. long, subentire to remotely denticu- 

 late, on short petioles ; flowers few, erect in bud ; fruiting pedicels 1-2 cm. long ; sepals 3-4 mm. 

 long; petals purplish to rose-colored, 5-6 mm. long; capsule purplish, subclavate, 2-2.5 cm. long, 

 stout, 1.5-2 mm. thick, frequently arcuate; seeds fusiform, papillose, 1.5-2 mm. long, with dingy 

 coma. 



Talus and slides, Arctic- Alpine Zone; British Columbia to Oregon, Montana, Utah, and Colorado Intergrad- 

 ing with the preceding species and the two following ones. Type locality: Kickmg Horse River, Birtish Columbia. 

 July-Aug. 



20. Epilobium Hornemannii Reichb. Hornemann's Willow-herb. Fig. 3378. 



Epilobium Hornemannii Reichb. Ic. Bot. Crit. 2: 73. 1824. 



Perennial, with subterranean scaly branches ; stems slender, erect except at very base simple, 

 1-3 dm tall, glabrous except for the crisp pubescence on the decurrent lines, slightly glandular 

 above. Leaves ovate to elliptic-ovate, 1.5-4 cm. long, mostly obtuse, subentire or remotely serru- 

 late, on short petioles ; flowers few, erect ; fruiting pedicels 1-2 cm. long ; sepals 3-4 mm. long ; 

 petals purplish or violet, 5-8 mm. long ; capsules erect,_ linear, slender, less than 1 mm. thick, 

 4-5 cm. long ; seeds usually papillose, 1 mm. long, with dingy coma. 



Damp banks and meadows. Hudsonian Zone; Alaska to central California, Greenland, New Hampshire. Colo- 

 rado; also Eurasia. Type locality: Norway. July-Aug. 



Epilobium Treleasianum Levi. Rep. Nov. Spec. 5: 8. 1908. Like E. "^'\''2"::.'J^Sh'Vl?tllTo-''\^^mm 

 with stems 2-4 dm. tall. Leaves ovate, acutish, serrulate, 3-;5.5 cm 1°%= ^^Pf^^ 5-6 mm. long P^t||^10-^2 ™rn^ 

 long; seeds papillose. Damp places, Hudsonian Zone Washington (Mount Maimer Mount Ad^s btevens 

 Pass). Not certainly distinct from E. Horncmanmv. Type locality: Selkirk Range, British Columbia. 



21. Epilobium lactiflorum Hausskn. White-flowered Willow-herb. Fig. 3379. 



Epilobium lactiflorum Hausskn. Oest. Bot. Zeitschr. 29: 89. 1879. 



Epilobium alpinum of American authors, not L. 



Size and habit of the preceding species, but more glabrous on decurrent lines as well as in 

 the inflorescence. Leaves delicate, pale green, subentire or obscurely denticulate, elliptic or ob- 



