ONAGRACEAE (EVENING-PRIMROSE FAMILY) i6l 



\. 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 nam. long. E. S. Implexum 



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

 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 

 A A. Flowers white or rose-color. 



F. Leaves oblanceolate. E. S. tortum 



FF. Leaves ovate. E. S. boothii 



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. laslospermum 

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

 AA. Seed glabrous. 



C. Capsule nearly sessile; branches nearly all from near the base of the etem. 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. ramosslssimum 



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 



p. s R. EL. TL. — II 



