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ovary, costate; margin 4 or 5-parted. Petals 
4 or 5, and their multiples. Stamens o, 
some of the external sometimes petaloid. 
Ovary inferior, 1-celled; ovules ©; style 1. 
Fruit a capsule immersed in the calyx tube. 
1, Mentzelia L. 
Calyx limb 5-parted, persistent. Petals not 
cucullate. Stamens o, inserted in the throat 
of the calyx below the petals. Style 3-cleft. 
Capsule dehiscent neur the apex. 
1. M. Livoreyi Torr. & Gray. Petals obo- 
vate, abruptly acuminate, yellow.—©. Niles. 
Sufiol. San Leandro. Summer. 
2. M. uavicautis Torr. & Gray. Petals 
lanceolate, cream-colored.—@ ©. Arroyo del 
Monte, near Livermore. Summer. 
Family 3, DATISCER. 
Calyx tube connate with ovary. Petals 0. 
Ovary l-celled; placente on the middle nerve 
of the carpidia; ovules o ; styles on the mar- 
gins of the carpidia, 2 for each placenta, some- 
times united into a contiguous style. Fruit a 
capsule, crowned by the calyx margin and 
style. , 
1, Tricerastes Presl. (Datisca L). 
Flowers 8. Calyx-tube 3-angular; margin 
3-dentate. Stamens 3, alternate with the lobes 
of the calyx; anthers extrorse. Ovary with 
