EVENING-PRIMROSE FAMILY 173 



Nevada, California, east to Idaho and Nevada. Type locality : Squaw Valley, Tahoe region, California. July-Sept. 

 Epilobium obcordatum var. laxum (Hausskn.) Dempster ex Jepson, Fl. Calif. 2: 566. 1936. (.Epilobium 

 obcordatum f. laxum Hausskn. Mon. Epilob. 251. 1884.) Leaf-blades 10-22 mm. long, subacute. Hudsonian Zone 

 of Trinity, Siskiyou, and Placer Counties, California. Type locality: not given. 



4. Epilobium rigidum Hausskn. Stiff Willow-herb. Fig. 3362. 



£/>t7o6tum riffirfiim Hausskn. Oest. Bot. Zeitschr. 29: 51. 1879. 



Epilobium rigidum var. canescens Trelease, Rep. Mo. Bot. Card. 2: 83. 1891. 



Resembling the preceding species, but somewhat taller, canescently pubescent above or even 

 throughout. Leaves 3-4 cm. long, obscurely if at all denticulate, acute or nearly so at both ends, 

 cuneately narrowed into petioles 5-8 mm. long ; flowers rather few in axils of reduced upper 

 leaves; hypanthium 1-1.5 mm. long; sepals 9-10 mm. long; petals, stamens, pistil much as in 

 the preceding; capsules densely white-glandular, 2-2.5 cm. long; seeds apparently smooth, about 

 2 mm. long. 



Dry stream beds. Transition and Canadian Zones; Siskiyou Mountains, Josephine County, Oregon. Type 

 locality: "Coast Range, California. Lat. 42°." July-Aug. 



5. Epilobium liiteum Pursh. Yellow Willow-herb. Fig. 3363. 



Epilobium lutcum Pursh, Fl. Amer. Sept. 1 : 259. 1814. 



Perennial, with creeping underground rootstock and turions ; stem subsimple, erect, 1 .5-7 dm. 

 tall, glabrous except for the pubescence in decurrent lines above. Leaves 2-7 cm. long, ovate to 

 ovate-lanceolate, quite glabrous, acute to acuminate, sessile or nearly so, sinuate-dentate, the teeth 

 gland-tipped ; inflorescence glandular-pubescent ; flowers few, in axils of somewhat reduced 

 upper leaves; pedicels 1-2 cm. long; hypanthium campanulate, 1.5 mm. long; sepals lanceolate, 

 10-12 mm. long; petals yellow, obcordate, 14-18 mm. long; stamens 8, in 2 series, one-half and 

 two-thirds the length of the petals ; style exceeding petals, obconic toward apex and 4-parted ; 

 capsule linear, 4-7 cm. long; seeds obovoid, quite smooth, 1.25 mm. long, coma reddish. 



Wet places, Canadian and Hudsonian Zones; from Alaska to Oregon. Type locality: northwest coast of 

 America. July-Aug. 



Epilobium suffruticosum Nutt. in Terr. & Gray, Fl. N. Amer. 1 : 488. 1840. Said to have come originally 

 from "Oregon near Walla Walla," occurs from Montana and Wyoming at least as far west as Idaho, and is doubt- 

 ful for our range Characterized by its suffruticose habit; lanceolate, sessile, mostly opposite, cinereous-stngose 

 leaves which are 1-2.5 cm. long; pale yellow flowers with petals 5-8 mm. long; capsules 1.5-2.5 cm. long, and 

 seeds 2.5-3 mm. long. 



6. Epilobium nivium Brandg. Snow Mountain Willow-herb. Fig. 3364. 



Epilnbium nivium Brandg. Zoe 3: 242. 1892. 



Sufifrutescent with several stems from a short, branched caudex, 1-2 dm. tall, pubescent 

 throughout. Leaves oblong- to elliptic-lanceolate, thick, not veiny, entire, tipped with stout gland, 

 sessile or short-petioled, 8-15 mm. long; flowers few, in axils of upper leaves; pedicels 3-5 mm. 

 long- hypanthium reddish, enlarged above ovary, narrow, 5-7 mm. long; sepals lanceolate, 3-5 

 mm. long ; petals violet-purple, obcordate, 7-10 mm. long ; stamens in 2 sets, the longer one-lialt 

 the length of the petals ; pistil equaling petals ; stigma with 4 short lobes ; capsule subfusitorm, 

 stout, 10-12 mm. long; seeds rather few, smooth, with dingy coma. 



Dry slopes, Canadian Zone; Inner North Coast Ranges of California. Type locality: Snow Mountain, Lake 

 County, California. Sept. 



7. Epilobium paniculatum Nutt. Panicled Willow-herb. Fig. 3365. 



Epilobium paniculatum Nutt. ex Torr. & Gray, Fl. N. Amer. 1 : 490. 1840. 

 Epilobium paniculatum f. bracteata Hausskn. Mon. Epilob. 247. 1884. 



Erect annual with simple stem and shreddy epidermis below, paniculately branched above, 

 3-9 (20) dm. tall, glabrous except for the tips of the inflorescence which are usually slightly 

 glandular-puberulent. Leaves linear-lanceolate to linear, 2-3 (5) cm. long, usually alternate 

 short-petioled, remotely denticulate, with thickened acute tip and teeth, quite early deciduous and 

 with fascicles of smaller leaves in axils; flowers in lax racemes «" j^l'^^^^^ i"; ^"^i\^f °^^^^^^ 

 panicle; bracts subulate; pedicels 5-15 mm. long, usually slightly glandular-puberulent hypan^ 

 fhium 2-3 mm. long, usually glabrous; sepals 2-3 mm. long ; petals pink to almost wh e 3-^ 

 mm. long, deeply 2-cleft, rotate; stamens about one-third the length of petas ; style about one- 

 hLlf the length of petals ; capsule 2-2 . 5 cm. long, 4-angled, linear-clavate, beaked, usually slightly 

 glandular-puberulent; seeds obovoid, flattened, 2 mm. long, with tawny coma. , ^ ,• 



Open, usually rather dry ground. Upper Sonoran and Transition Zones BHtish Columbia t^^^^^^^ 

 fornia, east to South Dakota and New Mexico. A variable species. Type locality, plains ot the uregon ana x^ocKy 

 Mountains." June-Sept. . 



Epilobium paniculatum f. adenocladon (first s^tWti adcnoclada) Hausskn. 5°"- Epilob. 247 1884^ {tp^- 

 lobiumadcnocladon Rydb. Bull. Torrey Club 33: 146. 1906; £. ^°"?^"'?/X' J-SuksT^ W^^^^^ 

 E. apricum Suksd. W. Amer. Sci. 11 : 77. 1901; £, ]ucundum var. '^'^^'{f "*"• ^^^e soedeJ^^^^^^ of 



Pedicels and capsules glandular-puberulent, the pedicels densely so; flowers as in the species. Witn rne ra t. 

 the species and very common. Type locality: mountains of Loloraao. 



EpHobium paniculatum f. subulatum (spelled subulata originally) Hausskn. ^^.^Jffif^^'^^lfs"'''^^^^^ 



Rydb. ^Bull. Torrey Club 40 : 64. . 1913 ; E paniculatum var ^"^" ^'"f^/^^^f/^^'tKngt of 'the species;' fairly 



name.) Pedicels and capsules entirely glabrous; flowers as in the species, vv itn tne range oi 



common. Type locality: on the Columbia River. • -d jk 



Epilobium paniculatum f. Tracyi (Rydb.) St. John Fl. S-E-Wash^ 275 1937. ^/£g-J-g|iKf- 

 Bull. Torrev Club 40: 63. 1913.) Hypanthium less than 2 mm. long; flowers whitish. WasUington 

 and east to Montana and Ontario. Type locality: Ogden, U tan. out 



Epilobium paniculatum f. laevicaule (Rydb.) St. John, loc. cit. (Epilobium laevicaule Rydb. Bull. Torrey 



