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ovary, costate; margin 4 or 5-parted. Petals 

 4 or 5, and their multiples. Stamens GO , 

 some of the external sometimes petaloid. 

 Ovary inferior, 1-celled; ovules GO ; style 1. 

 Fruit a capsule immersed in the calyx tube. 



1, Mentzelia L 



Calyx limb 5-parted, persistent. Petals not 

 cucullate. Stamens oo, inserted in the throat 

 of the calyx below the petals. Style 3-cleft. 

 Capsule dehiscent near the apex. 



1. M. LINDLEYI Torr. & Gray. Petals obo- 

 vate, abruptly acuminate, yellow. 0. Niles. 

 Sunol. San Leandro. Summer. 



2. M. L^EVICAULIS Torr. & Gray. Petals 

 lanceolate, cream-colored. 0. Arroyo del 

 Monte, near Livermore. Summer. 



Family 3. DATISCE-ffi, 



Calyx tube connate with ovary. Petals 0. 

 Ovary 1-celled; placentae on the middle nerve 

 of the carpidia: ovules oo ; 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 $ . Calyx-tube 3-angular; margin 

 3-dentate. Stamens 3, alternate with the lobes 

 of the calyx; anthers extrorse. Ovary with 



