EPILOBIACEAE. 
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Capsule linear, sessile, narrowed above. 12. Sphaerostigma. 
Capsule more or less clavate, pedicelled and obtuse. 
13. Chylisma. 
Fruit indehiscent, nut-like. 
Hypanthium-tube filiform; filaments unappendaged; ovary 1-celled . 
14. Stenosiphon. 
Hypanthium-tube obconic : filaments with scales at the base; ovary 4-celled. 
15. Gaura. 
Flowers 2-merous ; fruit indehiscent, obovoid and bristly with hooked hairs. 
16. Circaea. 
1. CHAMAENERION Adans. Fire-weed. 
Style pubescent at the base; leaves lanceolate or linear-lanceolate with the 
lateral veins confluent in marginal loops. 1. C. angustifolium. 
Style glabrous; leaves ovate or ovate-lanceolate; lateral veins obsolete, not looped. 
2. C. latifolium. 
1. Chamaenerion angustifolium (L.) Scop. ( Epilobium angustifolium L.) 
On hills, in open woods and copses, especially on burnt areas from Greenl. and 
Alaska to N. C., Ariz. and Calif.—Alt. 6000-10,000.—Caribou; foot-hills, 
Larimer Co.; Oro City; Estes Park, Larimer Co.; Pagosa Peak; near La 
Plata Post Office; La Plata Canon; Marshall Pass; Cameron Pass; Pike’s 
Peak; Red Mountain, south of Ouray; Jack’s Cabin; Artist’s Glen; Como; 
Larimie River at Sherwood’s; Baxter’s ranch; Bosworth’s ranch, Stove 
Prairie; Boulder Canon; mountains between Sunshine and Ward. 
2. Chamaenerion latifolium (L.) Sweet. ( E . latifolium L.) In wet ground 
from Greenl. and Alaska to Colo, and Wash.—Alt. 7500-10,000 ft.—Graymont; 
Ruby; Gunnison; near La Plata Post Office; La Plata Canon; Clear Creek; 
Empire. 
2. EPILOBIUM L. Willow-herb. 
Perennials; stigma entire or merely notched. 
Leaves oblong, oval, ovate, or lanceolate, usually dentate or denticulate. 
Plants with rosettes or turions ; leaves ovate or lanceolate, usually broadest 
below the middle and distinctly denticulate or dentate. 
Stem pubescent throughout. 1. E. Palmeri. 
Stem glabrous except sometimes the upper portion and the decurrent lines. 
Flowers 7-8 mm. long; petals purple or dark pink; leaves ovate- 
lanceolate. 
Leaves sessile or nearly so ; innovations by turions. 
Seeds without apiculations; coma sessile. 2. E. ovatifolium. 
Seeds with a pale hyaline beak at the apex. 3. E. brevistylum. 
Leaves short-petioled ; innovations by rosettes. 4. E. occidentale. 
Flowers 3-5 mm. long. 
Leaves all except the uppermost short-petioled. 
5. E. adenocaulon. 
Leaves all sessile or only the very earliest sometimes short-petioled. 
Leaf-blades rounded at the base, broadly lanceolate to ovate. 
Petals purple, 5-8 mm. long; leaf-blades usually ovate. 
2. E. ovatifolium. 
Petals white, 4 mm. long; leaves lanceolate. 
6 . E. rubescens. 
Leaf-blades acute at the base. 
Leaf-blades ample, ovate or broadly lanceolate. 
7. E. stramineum. 
Leaf-blades narrow lanceolate, almost erect; plant slender, 1-3 
dm. high. 8. E. Drummondii. 
Plants with stolons or soboles, low, 1-2 (seldom 3) dm. high. 
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