ONAGRACEAE (EVENING-PRIMROSE FAMILY) 161 



A. Flowers yellow or yellowish, sometimes turning red or green. 

 B. Capsule linear, more or less contorted. 



C. Stem glabrous; leaves 6-18 mm. long; petals 2-4 mm. long. W. E. 



S. contortum 



CC. Stems not glabrous; leaves longer; petals 6-8 mm. long. 



D. Stem puberulent; capsule 20-25 mm. long. E. S. implexum 



DD. Stem pubescent; capsule 8-16 mm. long. U. S. spirale 

 BB. Capsule attenuate upward from a wider base, straight. 



E. Seeds pale, linear; flowers barely 2 mm. long. E. S. andinum 



EE. Seeds dark, obovate or clavate; flowers 2-4 mm. long. E. S. hilgardi 

 AA. Flowers white or rose-color. 



F. Leaves oblanceolate. E. S. tortum 



FF. Leaves ovate. E. S. booth!! 



CHYLISMA 



Annual. Flowers yellow or rose-colored, in terminal racemes. Calyx 

 tube funnelform or obconic ; calyx segments 4. Petals 4, entire. Stamens 

 8, 4 shorter. Stigma capitate, entire. Capsule long, membranous, not 

 sessile. Seeds in i row in each cell. (Probably Gk. chylos = plant juice.) 



A. Flowers yellow. E. C. scapoidea 



AA. Flowers rose-colored. E. C. cruciformis 



GAYOPHYTUM 



Annual. Flowers axillary. Calyx segments 4. Petals 4, white or rose- 

 colored, very small. Stamens 8, 4 shorter. Stigma entire. Capsule 

 membranous, clavate, 2-celled, 4-valved. Seeds in i row in each cell. 

 (Probably Gk. gaios = on land, phyton = a plant.) 



A. Seed hairy. 



B. Stem 2-3 dm. high; petals about 2 mm. long; pod scarcely torulose. C. E. 



G. lasiospermum 



BB. Stems 3-5 dm. high; petals 6-8 mm. long; pod torulose. E. G. eriospermum 

 AA. Seed glabrous. 



C. Capsule nearly sessile; branches nearly all from near the base of the stem. C. E. 



G. racemosum 



CC. Capsules on elongated pedicels; branches mostly from the upper part of the 

 stem. 



D. Flowers 5-12 mm. wide. E. G. diffusum 

 DD. Flowers 2-4 mm. wide. C. E. G. ramossissimum 



CIRCAEA (ENCHANTER'S NIGHTSHADE) 



Perennial, low. Flowers small, white, in terminal and lateral racemes. 

 Stamens alternate with the petals. Fruit a capsule, small, densely hispid 

 with hooked hairs, indehiscent, i-celled, i-seeded. (Honor of Circe, a 

 Greek enchantress, who is said to have used these plants.) 



A. Leaves dentate; racemes with minute setaceous bracts subtending the pedicels. 



W. C. E. C. alpina 



AA. Leaves undulate-denticulate; racemes bractless. W. C. E. C. pacifica 



F. & R. EL. FL. II 



