158 ONAGRACEAE (EVENING-PRIMROSE FAMILY) 



DD. Plants stemless or nearly so, the stems not over 3 cm. long. 

 O. Stigma capitate, entire or rarely with 4 shallow lobes; stamens of equal 

 length; petals white or yellow; pod not winged. TARAXIA (p. 160) 



OO. Stigma deeply cleft into 4 linear lobes; outer 4 stamens longer than the 



inner 4; petals white or rose-colored. 



P. Capsule not wing-angled; seed grooved on one side; leaves entire to pin- 

 natifid. PACHYLOPHUS (p. 160) 



PP. Capsule wing-angled; seed not grooved; leaves pinnatifid. E. (Honor 

 of Delavaux, the founder of a French botanical garden.) 



Lavauxia trilobata (3-LOBED PRIMROSE) 



EPILOBIUM (WILLOW-HERB) 



Annual or perennial. Leaves nearly sessile, entire or denticulate. 

 Flowers variously colored, racemose or paniculate. Calyx tube not con- 

 spicuously prolonged beyond the ovary; calyx deeply 4-lobed. Petals 4. 

 Stamens 8, 4 shorter. Capsule linear, 4-sided, 4-celled, 4-valved. Seeds 

 many, with a tuft of hair at the summit. (Gk. epi = on, lobion = a little 

 pod.) 



A. Calyx tube not extending beyond the ovary; flowers pink, 15 mm. or more wide. 



B. Stem 10-20 dm. high; leaves with a conspicuous vein along the margin; bracts 



small, not leaflike. W. C. E. E. angustifolium (FIREWEED) 



BB. Stem 1.5-5 dm. high; leaves without vein along the margin; bracts large, 



leaflike. W. C. E. E. latifollum 



AA. Calyx tube extending beyond the ovary; flowers white or pink or yellow, often 



less than 15 mm. wide. These, though common, are too difficult for beginners. 



(F. & R. pp. 262-264.) 



BOISDUVALIA 



Annual. Leaves sessile. Flowers small, in spikes; spikes leafy, simple 

 or compound. Calyx tube funnelform, deciduous. Petals 4, white to 

 purple. Stamens 8, 4 shorter. Capsule membranous, 4-celled, nearly 

 terete, sessile, acute. (Honor of J. H. Bois Duval, a French naturalist.) 



A. Upper leaves much wider than the lower ones; flowers often in numerous lateral spike- 

 lets. W. E. B. densiflora 

 AA. Upper leaves not wider than the lower ones; flowers in simple terminal spikes 



or solitary in the leaf axils. 



B. Leaves narrowly lanceolate, pubescent; capsule linear-acuminate, 8-12 mm. 



long, its cells 6-8-seeded. W. E. B. stricta 



BB. Leaves ovate-lanceolate, often glabrous; capsule ovate-oblong, 4-8 mm. long, 



its cells 4-6-seeded. E. B. glabella 



CLARKIA 



Annual, erect; stems brittle. Leaves entire. Flowers showy, in 

 terminal racemes. Calyx tube obconic, deciduous; calyx limb 4-cleft. 

 Petals 4. Stamens 8, 4 often rudimentary. Capsule 4-celled, coriaceous, 

 erect, angled, 4-celled. Seeds many. (Honor of W. Clark, of the Lewis 

 and Clark Expedition.) 



