262 Onagraceae 
AA. Calyx-tube extending beyond the ovary; flowers white or pink or yellow, often 
less than 15 mm. wide. LYSIMACHION (p. 262) 
Subgenus CHAMAENERION—Corolla slightly irregular, widely spreading. 
Stigma 4-lobed. . 
A. Stem 10—20 dm. high; leaves with a conspicuous vein along the margin; bracts 
small, not leaf-like; style pubescent at base. W.C. E. (E. spicatum; Chamaenerion 
angustifolium. ) E. angustifolium L. (Fire-weed) 
AA. Stem 1.5—5 dm. high; leaves without vein along the margin; bracts large, leaf- 
_ like; style glabrous. W.C.E. (Chamaenerion latifolium.) 
E. latifolium L. 
Subgenus LYSIMACHION—Corolla regular, not more spreading than campanu- 
late. Stigma entire to 4-lobed. 
A. Stigma deeply 4-lobed; flowers sometimes yellow. Group | (p. 262) 
AA. Stigma entire or merely notched; flowers white or pink. Group 2 (p. 262) 
GROUP 1 
A. Flowers yellow or cream-color. 
B. Leaves broadly lanceolate or wider, 2.5——7.5 cm. long, glabrous; flowers bright 
yellow; petals 15—18 mm. long. W. C. E. 
E. luteum Pursh (Yellow Willow-herb) 
BB. Leaves widely lanceolate, less than 2 cm. lorg, canescent; flowers cream-color; 
petals 5—-8 mm. long. E. 
E. suffruticosum Nutt. (Cream-colored Willow-herb) 
AA. Flowers white or pink. 
C. . Plant 1—2'dm:-high: leaves. all entire or merely undulate. 
i. Leaves entire, 1.7—4 cm. long; petals. 15-20 mm. long; stgima very rough 
with lorg papillae, its lobes twice as long as wide. U. (E. rigidum canescens. ) 
E. rigidum Haus. 
DD. Leaves undulate, 1.2—2 cm. long; petals 3—4 mm. long; stigma almost 
smooth, lobes very shallow, rot as long as wide. W. C. E. 
E. minutum Lindl. 
CC. Plant 3—12 dm. high; at least the lower leaves. somewhat denticulate; petals 
3—20 mm. long. 
F. Leaves clesely denticulate, obtuse: capsule about 4 cm. long. U. 
E. oreganum Gr. 
EF. Leaves entire or sparingly denticulate, or acuminate; capsule about 2 mm. 
long. 
F. Flowers 1—1.5 em. wide. -W. C. E: 
E. paniculatum Nutt. 
FF. Flowers 2—4 cm. wide. U. E. (E. hammondi: E. paniculatum ju- 
cundum.) E. jucundum Gray 
GROUP 2 
A. Stems tall, 3—9 dm. high. 
B. Leaf-margin revolute; leaves sessile, nearly entire, linear-oblons. E. . 
E. palustre L. 
BB. Leaf-margin plane or involute. 
C. Annual; leaves lanceolate or linear-lanceolate. 
D. Branches many; leaves 2.5——5 cm. long, acute, sparingly denticulate; cap- 
sule about 2 cm. long. (See HH.) 
DD. Branches few; leaves 5—-7.5 cm. long, obtuse, closely denticulate; capsule 
about 4 cm. long. U. E, oreganum Gr. 

