176 ONAGRACEAE 



12. Epilobium brevistylum Barbey. Slender Willow-herb. Fig. 3370. 



Epilobium brevistylum Barbey, Bot. Calif. 1: 220. 1876. 



Perennial with well-formed, compact turions, the dried scales of which persist at the base of 

 the stem of the succeeding year ; stems erect, simple or subsimple, slender, 2-6 dm. tall, glabrous 

 below, crisp-pubescent or somewhat glandular about the inflorescence. Leaves ovate to elliptic- 

 lanceolate or even linear-lanceolate, denticulate, with rounded, sessile base, almost entirely oppo- 

 site, 2-4 cm. long, not crowded, drying pale ; flowers several, but not in great numbers ; fruiting 

 pedicels 5-15 mm. long; sepals 2-3 mm. long; petals purplish or paler, emarginate, 3-5 mm. 

 long; capsules 4-6 cm. long; seeds about 1 .5 mm. long, papillate, broad, with whitish coma. 



Wet places, Transition and Hudsonian Zones; Washington to southern California, east to Montana and 

 Colorado. Type locality: Sierra County, California. June-Aug. 



Epilobium brevistylum var. ursinum (Parish) Jepson, Man. Fl. PI. Calif. 670. 1925. {Epilobium Smithii 

 Levi. Rep. Nov. Spec. 5: 8. 1908.) Simple, 2-5 dm. tall; both leaves and lower stem pilose with remote and 

 spreading, long, white hairs. With the species from Washington to southern California and Idaho. Type lo- 

 cality: San Bernardino Mountains, California. 



Epilobium brevistylum var. subfalcatum (Trelease) Munz. {Epilobium ursinum subfalcatum Trelease, 

 Rep. Mo. Bot. Card. 2: 101. 1891; Epilobium brevistylum var. Pringleanum (Hausskn.) Jepson, Man. Fl. PI. 

 Calif. 670. 1925.) Low, 10-15 cm. tall, with a short, dense, pilose pubescence throughout; leaves oblong-linear, 

 remote, entire or nearly so, erect, obtuse, sessile, of only 3-5 pairs. Occasional in similar situations to the 

 species; Washington to the mountains of central California, Idaho, and Nevada. Type locality: "California, 

 mountains about the headwaters of the Sacramento River." 



Epilobium brevistylum var. tenue (Trelease) Jepson, Man. Fl. PI. Calif. 670. 1925. {Epilobium delicatum 

 var. tcnue Trelease, Rep. Mo. Bot. Card. 2: 99. 1891.) Like the preceding variety and growing with it, but 

 glabrous. Rare. Type locality: Union County, Oregon. 



13. Epilobium Halleanum Hausskn. Hall's Willow-herb. Fig. 3371. 



Epilobium Halleanum Hausskn. Mon. Epilob. 261. 1884. 



Perennial, with small turions ; stems erect, slender, simple or nearly so, 1-4 dm. high, sub- 

 glabrous below, with lines of hair from the decurrent bases of the leaves, glandular-puberulent 

 in upper parts. Leaves lance-linear, erect, some with clasping base, 1.5-4 cm. long, serrulate to 

 entire, acute; flowers small; hypanthium 1-1.5 mm. long; sepals 2-3 mm. long; petals 2-4 mm. 

 long, white to purplish; fruiting pedicels 3-5 mm. long; capsules 2-5 cm. long; seeds 1-1.5 mm. 

 long, beaked. 



Wet places, Transition Zones, British Columbia to northern California, Montana, and Colorado. Type locality : 

 Oregon. July-Aug. 



14. Epilobium delicatum Trelease. Delicate Willow-herb. Fig. 3372. 



Epilobium delicatum Trelease, Rep. Mo. Bot. Gard. 2: 98. 1891. 



Perennial producing turions, the stems slender, mostly simple, glabrous except for the crisp 

 hairy lines decurrent from the upper nodes, and with glandular inflorescence. Leaves opposite, 

 ovate-lanceolate, up to 7.5 cm. long, divergent, rounded at base and subsessile or cuneate and 

 short-petioled, thin and pale, undulately denticulate ; flowers few ; petals 5-8 mm. long ; capsules 

 4-6 cm. long, their pedicels slender, about half as long; seeds 0.3-1 mm. long, finely papillate. 



Bogs and wet meadows, Arid Transition and Canadian Zones; British Colmnbia to eastern Oregon and Mon- 

 tana. Type locality: Union County, Oregon. July-Aug. 



15. Epilobium leptocarpum Hausskn. Slencier-fruited Willow-herb. Fig. 3373. 



Epilobium leptocarpum Hausskn. Mon. Epilob. 258. pi. 14, fig. 67. 1884. 



Perennial, apparently with small turions ; stems slender, much branched, reddish, 1 dm. or 

 less tall, glabrous except for some incurved pubescence. Leaves 1-2 cm. long, broadly lanceolate, 

 obtuse, remotely few-toothed, with short-winged petioles ; flowers abundant for the size of the 

 plant; petals 3 mm. long, white to pinkish; capsules 2-3 cm. long, on slender pedicels 1-2 cm. 

 long; seeds 0.75-1 mm. long, ellipsoidal, shortly hyaline-beaked, and with brownish coma. 



Apparently rare. Boreal Zones; Cascade Mountains, Oregon. Type locality: Oregon. July-Aug. 



Epilobium leptocarpum var. Macounii Trelease, Rep. Mo. Bot. Gard. 2: 103. 1891. {Epilobium paddoense 

 Levi. Rep. Nov. Spec. 5: 8. 1908.) Less branched; pubescence of stem more definitely in lines and extending to 

 flowers and capsules. Leaves ovate-lanceolate; seeds 1 mm. long. Rock crevices in Boreal Zones; Alaska to Wash- 

 ington (Olympic Mountains, Mount Adams, and Pend Oreille County), and Idaho. Type locality: Lake Athabasca. 



Epilobium mir^bile Trelease in Piper, Contr. U.S. Nat. Herb. 11: 404. 1906. Uncertainly distinct from 

 E. leptocarpum, from which it differs by having seeds almost 2 mm. long. Olympic Mountains, Washington, the 

 type locality. 



16. Epilobium oregonense Hausskn. Oregon Willow-herb. Fig. 3374. 



Epilobium oregonense Hausskn. Mon. Epilob. 276. 1884. 



Epilobium oregonense var. gracillimum Trelease, Rep. Mo. Bot. Gard. 2: 109. 1891. 



Perennial, stoloniferous ; stems simple, slender, erect, 1-3 dm. high, glabrous except for some 

 sparse glandular pubescence in inflorescence, often purpHsh above. Leaves somewhat crowded on 

 lower portion of stem, reduced and remote above, glabrous, oblong-linear to -ovate, entire to 

 remotely denticulate, suberect, obtuse, sessile, 1-2.5 cm. long; flowers 1 to few; fruiting pedicels 

 1-3.5 cm. long; sepals often purplish, 1-2 mm. long; petals cream-colored to_ purplish, 4-7 mm. 

 long, deeply emarginate; capsules erect, 2-5 cm. long, slender, often purplish; seeds smooth, 

 blunt, scarcely 1 mm. long, with white coma. 



