ONAGRACEAE. 655 



suie 2-3 times as long as the peduncle, 4-sided, the angles somewhat winged; seeds 

 in several rows in each cavity. In swamps, Md. to Ga., Ma., 111., Ark. and Tex. 

 July-Sept. 



5. CHAMAENERION Adans. 



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

 alternate, entire; flowers irregular, showy, in terminal racemes; calyx-tube not 

 prolonged beyond the ovary; calyx-segments 4, deciduous; petals 4, entire; sta-| 

 mens 8, declined; filaments dilated at the base; stigmas 4-cleft. Capsule obtusely 

 4-angled, elongated, opening loculicidally. Seeds with a tuft of hairs (coma) at 

 the end. [Greek, ground rose-bay.] About 4 species, chiefly in the north tem- 

 perate zone. 



Bracts small; lateral nerves of the leaves confluent in marginal loops; style pubescent at 

 the base. 1. C. angustifolium. 



Bracts leaf-like; lateral nerves of the leaves obsolete; style glabrous. 2. C. latifolium. 



i. Chamaenerion angustifolium (L.) Scop. Great or Spiked Willow- 

 herb. Fire-weed. (I. F. f. 2566.) Erect, often finely pubescent above, 

 0.5-2.5 m. high. Leaves lanceolate, 5— 15 cm. long, pale beneath, acute at 

 the apex; flowers 1.5-3 cm. broad, purple, or sometimes white, in elongated 

 terminal spike-like racemes; capsules 5-7.5 cm. long, finely canescent, at least 

 when young; seeds about I mm. long, the coma long, whitish. In dry soil, Lab. 

 to Alaska, N. Car., Kans., Ariz, and Cal. Also in Europe and Asia. June-Sept. 



2. Chamaenerion latifolium (L.) Sweet. Broad-leaved Willow-herb. 

 (I. F. f. 2567.) Erect, often quite canescent above, 1.5-5 dm. bigb. Leaves 

 2.5-5 cm. long, lanceolate or ovate-lanceolate, acutish at both ends, thick, those of 

 the branches opposite, the veins inconspicuous; flowers purple, 2.5-5 cm - broad, 

 in mainly short leafy-bracted racemes; capsules 1-3 cm. long, canescent; seeds 

 about 2 mm. long; coma elongated, whitish. Moist ground, Newf. to Alaska, 

 Quebec, Colo, and Ore. Also in Europe and Asia. June-Aug. 



6. EPILOBIUM L. 



Herbs, or sometimes shrubby plants, with alternate or opposite leaves, and soli- 

 tary, spicate or racemose flowers. Calyx-tube prolonged beyond the ovary, the 

 limb 4-parted. deciduous. Petals 4, often notched. Stamens 8; stigma club- 

 shaped or 4-lobed. Capsule narrow, elongated, 4-sided, loculicidally dehiscent 

 by 4 valves. Seeds with a tuft of hairs (coma) at the summit. [Greek, upon 

 a pod. flower and pod appearing together.] About 65 species, of wide geo- 

 graphic distribution, most abundant in temperate regions. Besides the following, 

 about 30 others occur in the western and northwestern parts of N. Am. 



Stigma deeply 4-lobed ; flowers large. 1. E. hirsutum. 



Stigma entire, or merely notched. 



Seeds smooth or nearly so ; arctic or alpine species. 



Flowers white: leaves usually denticulate. 2. E. alpinum. 



Flowers violet; leaves mostly entire. 3. E. anagallidifolium. 



Seeds papillose. 



Leaves linear or lanceolate, entire or nearly so. 

 Plants crisp-pubescent or canescent. 



Leaves sessile, mostly obtuse. 4. E. palustre. 



Leaves petioled, very narrow, acute. 5. E. lineare. 



Plants glandular-pubescent throughout, or only above. 



Densely glandular throughout; leaves sessile. 6. E. strictum. 

 Glandular-pubescent above; leaves petioled. 7. E. paniculatum. 

 Leaves lanceolate or ovate, serrate. 



Leaves lanceolate, acute or acuminate. 



Seeds obconic, beakless ; coma reddish. 8. E. coloratum. 



Seeds ellipsoid, short-beaked; coma white. 9. E. adenocaulon. 



Leaves ovate, thin, obtuse. 10. E. Hornemanni, 



i. Epilobium hirsutum L. Great Hairy Willow-herb. (I. F. f. 2568.) 

 Stout. 5-12 dm. high, softly hirsute-pubescent. Leaves lanceolate or oblong-Ian- 

 ceolate, usually opposite, often clasping at the base, acute at the apex, sharply ser. 



