l6o ONAGRACEAE (EVENING-PRIMROSE FAMILY) 



BB. Calyx lobes densely hairy, as long as or longer than the calyx tube; biennial. 



C. Flowers yellow or purplish, drying lighter; stems erect. W. E. O. hookeri 

 CC. Flowers yellow, drying darker; stems spreading. E. O. ornata 



ANOGRA (White Evening Primrose) 



Annual or perennial. Flowers diurnal, nodding in bud. Calyx tube 

 prolonged above the ovary, deciduous ; calyx segments 4, narrow. Stamens 

 8, unequal; anthers versatile. Capsule loculicidal. — (An anagram of 

 Onagra.) 



A. Calyx villous or densely strigose; at least some of the leaves deeply pinnatifid. E. 



A. trichocalyx 



AA. Calyx glabrate or sparsely hairy; leaves entire to merely short-lobed. 



B. Leaves glabrous; capsules divaricate, usually some of them contorted or twisted. 



E. A. pallida 



BB. Leaves pubescent beneath; capsules ascending, straight. E. A. nuttallil 



PACHYLOPHUS (Stemless Evening Primrose) 



Herbs, perennial. Flowers large, white or rose-colored. Calyx tube 

 elongated; lipib 4-parted, erect in the bud. Petals 4, sessile, white but 

 changing to red in age. Capsule ovate or ovate-oblong, large, rigid, 4- 

 angled. Seeds in i or 2 rows. — (Gk. pachys = thick, lophis = a crest; 

 referring to the warty edges of the capsule.) 



A. Plant wholly glabrous throughout; petals 2-4 cm. long. E. P, caespitosus 

 AA. Plant more or less pubescent or hairy; petals 4-6 cm. long. 



B. Leaves green, glabrous except for the villous margin. E. P. marginatus 



BB. Leaves catiescent-puberulent on both sides. E. P. canescens 



TARAXIA 



Leaves entire to pinnatifid. Flowers axillary. Calyx tube filiform, 

 longer than the ovary; limb 4-parted. Petals 4. Stamens 8. Capsule 

 sessile. Seeds in 2 rows in each cell. — (Gk. taraxis = trouble or con- 

 fusion ; apparently a puzzling genus.) 



A. Leaves deeply pinnatifid. 



B. Plant white-pubescent. E. T. breviflora 

 BB. Plants glabrous or nearly so. (See D.) 



AA. Leaves entire to repand-denticulate. 



C. Plant perennial, glabrous or somewhat pubescent; leaves oblong-lanceolate. 



D. Plant glabrous; capsule 1.5-2 cm. long; seeds many. E. T. heterantha 

 DD. Plant somewhat pubescent: capsule 1.2 cm. long; seeds few. E. T. ovata 



CC. Plant annual, villous; leaves linear. E. T. gracilliflora 



SPHAEROSTIGMA 



Flowers solitary or in spikes, white or rose-colored or yellow. Calyx 

 tube obconic or shortly f unnelform ; calyx segments 4, reflexed. Petals 4. 

 Stamens 8, somewhat unequal. Stigma capitate, entire. Capsule elongated. 

 Seeds in i row in each cell. — (Gk. sphaira = sphere ; -f stigma ; because 

 the stigma is capitate.) 



