596 ONAGRACEAE (EVENING PRIMROSE FAMILY) 



3. EPILOBIUM L. WILLOW-HERB 



Calyx-tube scarcely or not at all prolonged beyond the ovary ; limb 4-cleft or 

 -divided. Petals 4, violet, magenta, pink, or white. Capsule slender, many- 

 seeded. Seeds with a tuft of long hairs at the end. Mostly perennial herbs 

 with nearly sessile leaves. (Name from <??ri, on, and \6piov, a little pod.} 



1. CHAMAENERION [Tourn.] Tausch. Petal* entire, large, magenta 

 (rarely white') ; calyx-limb divided essentially to the summit of the ovary; 

 stamens and style successively deflexed; stigma of 4 long lobes ; flowers 

 racemed. 



1. E. angustif61ium L. (GREAT W., FIREWEED.) Tall (0.3-2 m. high), 

 simple ; leaves scattered, long, lanceolate, subentire, pinnately veined. (E. 

 Kpicfttum Lam. ; Chamaenerion angustifolium Scop.) Low ground, especially 

 in clearings and newly burned lands, common. July, Aug. (Eurasia.) 



2. LYSIMACHION Tausch. Petals notched at the summit; calyx-tube pro- 

 longed a little beyond the ovary ; stamens and style erect; flowers corymbed 

 or panicled or few in the upper axils. 



a. Stigina 4-parted ; petals 1-2 cm. long . ... 2. E.hirantum. 



a. Stigma entire ; petals smaller b. 



b. Steins terete, no decurrent lines running down from the bases of 



the leaves ; leaves entire or subentire, with re volute margins. 



Stem and pods densely covered with fine short straight spread- 



ing hairs ........... ". E. mollc. 



Stems and pods cinereous with appressed or incurved hairs, or 



glabrous. 

 Leaves closely and evenly pubescent above : well developed 



plant freely branching ....... 4. E. densum. 



Leaves glabrous above, or with scattered hairs ; plant simple 



or subsitnple ......... 5. E. paluutre. 



b. Stems subterete, with decurrent lines running down from the 

 bases of the leaves ; leaves toothed (rarely entire), flat, the 

 margins not revolute. 

 Stems solitary ; the basal shoots (developing in late autumn) 



in the form of sessile or short-stalked rosettes. 

 Seed abruptly contracted above ; mature coma cinnamon- 



color ; leaves elongate-lanceolate ..... 6. E. 



Seed gradually contracted to a hyaline neck ; coma whitish 

 leaves oblong-lanceolate to narrowl ova 



ate ... 7. E. adenocaulon. 

 Stems tufted ; the basal shoots quickly developing into elongate 



branches. 



Seed (under a microscope) smooth. 

 Stems erect ; flowers chiefly 3-0, the lowest in the axils of 



the folisige-leaves ........ 8. E. alpinum. 



Stems strongly decumbent ; flowers 1 or 2 (rarely 8), es- 



sentially terminal ........ 0. E. a nagallidi folium. 



Seed (under a microscope) papillose ..... 10. E. Hornema n'ui. 



2. E. HiRstiTUM L. Tall (1-2 in. high), the much branched st<'m 

 covered by rather long Jine straight spreading hairs; leaves oblong, serrulate, 

 sessile and clasping ; petals magenta, showy. In waste places and about 

 dwellings, local, s. Me. to Ont. and s. N. Y. July-Sept. (Nat. from Eu.) 



3. E. m611e Ton*. Erect, 2-15 dm. high, simple or with few upright 

 branches toward the summit, strms, /raves, and pods gray i. </>->;'/ n (>/; leaves 

 narrowly lanceolate to linear, entire or undulate, the margins revolute ; petals 

 pink, 7-H mm. long; seed nearly 2 mm. long, minutely papillate, coma dingy. 

 (E. xti-i'-tinn Mnlil.? as /><>,,!, ji xni>nn<hnn. ) Ko-s and' mossy meadows, rather 

 local, e. <^ne. In Athabasca, s. to Va.., 111., and Minn. July-Sept. 



4. E. d6nsum Kaf. Minuti'ly htHtry-jtln'*cpnt, 3-10 dm. high, usually much 

 branched and very leafy, rarely stolonit'erons ; li'tin-* lim-ar or nearly so, revo- 

 lute, acute, can f scent above (the lateral vt'ins in<-nxi>i<'tious") : erect, usually much 

 exceeding the internodes, commonly proliferous in the axils; pedicels J-i as 

 long as tiie cam'*; at ,,,nlx; petals :Y-5 mm. long, pink or white ; seed 1.5mm. 

 long. (A, 1 , linear* Mnld.? as nomen subnndnm. ) Open low grounds, e. Que. 

 to Alb., s. to Del., W. Va., Kan., and Col. -July-Sept. 



