336 ONAGRACEAE (EVENING PRIMROSE FAMILY) 



4. Epilobium alpinum L. Sp. PI. 1: 348. 1753. Size and habit of E. 

 Hornemannii but the inflorescence more nearly glabrous: leaves uniformly 

 distributed, thin and delicate, pale green, 4 cm. long, subelliptical, rather 

 obtuse, subentire to somewhat sharply serrulate, gradually narrowed to 

 slender petioles: flowers few, suberect in the upper axils: petals about 3 mm. 

 long, white or rosy-tipped: capsules very slender, erect or ascending, about 

 50 mm. long, their peduncles rather slender and about equaling the subtend- 

 ing leaves, or stouter and as long as the capsules: seeds smooth, gradually 

 attenuated at apex, with very evident beak. Widely distributed through 

 the northern part of the continent and in the high mountains. 



5. Epilobium anagallidifolium Lam. Diet. 2: 376. 1786. About 1 dm. 

 high, rather densely caespitose, the very slender stems curved and nodding 

 at apex, somewhat crisp-hairy at least in lines and occasionally very slightly 

 glandular in the inflorescence: leaves 10-20 mm. long, ascending, rather uni- 

 formly distributed, all but the lowermost very narrowly ovate or oblong, 

 rather obtuse, entire or remotely very low-denticulate, cuneately narrowed, 

 the lowest mostly wing-petioled, rather firm and inconspicuously veined: 

 flowers few, crowded at apex, somewhat nodding: petals lilac to violet, about 

 5 mm. long: capsules 25 mm. long, slender, their rather slender peduncles 

 shorter than the leaves or, when only one or two are present, equaling the 

 capsules: seeds somewhat obovoid-fusiform, short-beaked, coma rather dingy. 

 Circumpolar and extending south in our mountains to Colorado. 



6. Epilobium wyomingense A. Nels. Bot. Gaz. 30: 194. 1900. Stems 

 2-4 dm. high, strictly erect, simple or with erect opposite branches, glabrous 

 or obscurely pubescent above: leaves thin, narrow, tapering to both ends, 

 3-5 or more cm. long, in 4-7 equidistant pairs, often shorter than the inter- 

 nodes: flowers small, white: capsule linear, 4-7 cm. long, minutely cinereous- 

 puberulent; the pedicels variable, from much shorter to even exceeding the 

 capsule: seeds numerous, smooth, fusiform, scarcely beaked; the coma white, 

 persistent. Wyoming and Colorado. 



7. Epilobium lineare Muhl. Cat. 39. 1813. Slender, canescent throughout 

 with incurved hairs, 3-6 dm. high, at length much branched : leaves linear or 

 linear-lanceolate, mostly short-petioled, opposite or alternate, acute at both 

 ends, 2.5-5 cm. long, the veins obscure: flowers erect, pink or whitish, 4-8 mm. 

 broad; pedicels mostly slender: stigma entire or slightly notched: capsules 

 about 5 cm. long: seeds less than 2 mm. long, slightly papillose. Colorado 

 and Wyoming, and far northward and eastward. 



8. Epilobium saximontanum Hausskn. Oesterr. Bot. Zeitschr. 29: 119. 

 1879. Somewhat crisp-hairy, at least along the elevated lines, and glandular 

 above: leaves about 20 mm. long, mostly crowded and ascending or suberect, 

 oblong to elliptical, the upper rather acute, very minutely denticulate or 

 subentire, cuneately narrowed to the sessile base, or the lowest 3 cm. 

 long, more lanceolate, and with somewhat elongated winged base: flowers 

 few, pale to deep violet: capsules short-stalked: seeds slightly larger and 

 often less papillate. Said to occur in the mountains of Colorado and 

 Nevada. 



9. Epilobium clavatum Trelease, Rep. Mo. Bot. Gard. 2: 111. 1891.' One 

 dm. or more high, mostly densely caespitose, the slender stems ascending, 

 glabrate to sparingly glandular throughout: leav.es 15-20 mm. long, diver- 

 gent, broadly ovate, very obtuse, subentire to remotely serrulate, mostly 

 rounded to evident petioles, firm: flowers rather few, suberect: petals rose- 

 colored, about 5 mm. long: capsules 25 mm. long, subclavate, arcuately diver- 

 gent, their slender peduncles equaling the subtending leaves: seeds fusiform, 

 tapering into a pale beak, nearly smooth to coarsely papillate. Utah and 

 Colorado, northward and westward to Washington. 



10. Epilobium Drummondii Haussk. Monog. 271. 1884. Plant 2-3 dm. 

 high, glandular above, the decurrent lines subglabrate: leaves 2.5-^ cm. 

 long, typically remote and erect, lanceolate to almost linear-lanceolate, 

 rather acute, the upper, especially; denticulate, mostly rounded to the sub- 

 sessile base: flowers erect: petals 3-4 mm. long, usually pale: capsules 3-5 



