EPILOBIACEAE 839 



7. Jussiaea er6cta L. Stems glabrous, erect or ascending, 1-2 m. tall, branched : leaf- 

 blades lanceolate or linear-lanceolate, 5-12 cm. long, acuminate, flat, short-petioled : 

 hypanthium slender, elongated : sepals 4, lanceolate, 5 mm. long, acuminate : corolla deep 

 yellow, 1 cm. broad : petals about as long as the sepals : capsule-body cylindric, 1.5-2 cm. 

 long, 4-sided, narrowed into a very short pedicel-like base. 



In sand or sandy soil, Manatee, peninsular Florida. Also in tropical America. 



8. Jussiaea Peruviana L. Stems shrubby, 1-4 m. tall, hirsute, much branched, the 

 branches wide-spreading : leaf-blades ovate, oval, lanceolate or oblong-lanceolate, 4-10 cm. 

 long, abruptly or gradually acuminate, leathery, short-petioled : hypanthium hirsute, short- 

 obconic: sepals 4, lanceolate or ovate-lanceolate, 1-1.5 cm. long, ciliate : corolla large, 

 yellow, 4-5 cm. broad: petals broad, 2-3 cm. long: capsule-body oblong-obovate, 1.5-2 

 cm. long, 4-sided, somewhat longer than the stout pedicel-like base. 



On banks of rivers, lakes and in swamps, peninsular Florida. Also in tropical America. 



5. CHAMAENERION Adans. 



Perennial herbs, with tufted stems, often woody at the base. Leaves mostly alternate : 

 blades entire. Flowers irregular, showy, in terminal racemes. Hypanthium not prolonged 

 beyond the ovary. Sepals 4, deciduous. Petals 4, entire. Stamens 8, declined : filaments 

 dilated at the base. Ovary 4-celled : stigma 4-cleft. Capsule obtusely 4-angled, elongated, 

 loculicidal. Seeds with a tuft of hairs (coma) at the end. FIRE-WEED. WILLOW-HERB. 



1. Chamaenerion angustifolium (L. ) Scop. Stems erect, often finely pubescent 

 above, 0.5-2.5 m. high : leaf -blades lanceolate, 5-15 cm. long, pale beneath, acute at the 

 apex : flowers in elongated terminal spike-like racemes : corolla 1.5-3 cm. broad, purple, 

 or sometimes white : capsules 5-7.5 cm. long, finely canescent, at least when young : seeds 

 about 1 mm. long, the coma about 10 mm. long, whitish. [Epilobium angustifolium L. ] 



In dry soil, Labrador to Alaska, North Carolina. Kansas, Arizona and California. Also in Europe 

 and Asia. Summer to fall. 



6. EPILOBIUM L. 



Caulescent herbs, or sometimes shrubby plants. Leaves alternate or opposite : blades 

 often toothed. Flowers solitary, spicate or racemose. Hypanthium prolonged beyond 

 the ovary. Sepals 4, deciduous. Petals 4, often notched. Stamens 8. Ovary 4-celled : 

 stigma club-shaped or 4-lobed. Capsule narrow, elongated, 4-sided, loculicidal. Seeds 

 terminating in a tuft of hairs. WILLOW-HERB. The plants flower in summer and fall. 



Leaf-blades linear or linear-lanceolate, mostly entire. 1. E. lineare. 



Leaf-blades lanceolate to ovate-lanceolate, serrate. 2. E. coloratum. 



1. Epilobium lineare Muhl. Stems canescent throughout with incurved hairs, 3-6 

 dm. tall, at length much branched : leaf -blades linear or linear-lanceolate, acute at both 

 ends, 2.5-5 cm. long, mostly entire, usually short-petioled, the veins obscure: flowers 

 erect : corolla pink or whitish, 4-8 mm. broad : capsules about 5 cm. long : seeds less than 

 2 mm. long, slightly papillose. 



In swamps, New Brunswick to British Columbia, Delaware, the Indian Territory and Wyoming. 



2. Epilobium coloratum Muhl. Stems commonly much branched, 3-9 dm. tall, 

 more or less canescent above with incurved hairs which are often arranged in lines. Stem 

 and leaves often purplish : leaf-blades mainly lanceolate, acute or acuminate, 5-15 cm. 

 long, sharply serrulate or denticulate, generally short-petioled but sometimes sessile : 

 flowers generally nodding : corolla pink or white, 4-6 mm. broad : capsules short-pedi- 

 celled, finely pubescent, 2.5-5 cm. long : seeds papillose, less than 1 mm. long. 



In low grounds, Maine to Ontario, Wisconsin, South Dakota, South Carolina and Kansas. 



7. ONAGRA Adans. 



Annual or biennial herbs, with mostly erect stems. Leaves alternate : blades undulate 

 or toothed. Buds erect. Flowers nocturnal, in terminal spikes. Sepals elongated. 

 Corolla yellow. Ovary 4-celled. Ovules in 2 or more rows, horizontal. Capsule 4-angled, 

 more or less tapering, loculicidal. Seeds prismatic-angled. EVENING-PRIMROSE. 



Hypanthium slender, 2.5-5 cm, long : corolla 2.5-5 cm. broad. 1. 0. biennis. 



Hypanthium stout, 6-11 cm. long : corolla 8-13 cm. broad. 2. 0. Jamesii. 



1. Onagra bi6nnis (L.) Scop. Stems generally stout, 3-25 dm. tall, more or less 

 hirsute : leaf -blades oblong to lanceolate, 2.5-15 cm. long, acute or acuminate, repand- 

 denticulate : sepals slender, much longer than the hypanthium : corolla bright yellow, 2.5-5 



