334 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



completely or incompletely 4-celled; pistils 3 to 6 in fertile flowers; 

 fruit a dark-purple drupe, with a flattened stone. 



1. Cocculus diversifolius DC, Regni Veg. Syst. 1:523. 1818. 



Pima County, westward to the Baboquivari Mountains, 3,500 to 

 5,000 feet, in thickets, May to August. Southern Texas, southern 

 Arizona, and far south in Mexico. 



45. PAPAVERACEAE. Poppy family 



Plants herbaceous, of diverse character; leaves simple or decom- 

 pound; flowers perfect, regular or irregular, solitary or in small 

 clusters; sepals 2 or 3, caducous; petals 4 to 6, separate or the inner 

 ones cohering at apex; stamens 6 to numerous; fruits various. 



The outstanding plants of this family are the true poppies (genus 

 Papaver), comprising several species of great value as ornamentals, 

 one of them (P. somniferum L.) being the source of the drug opium. 

 This species was observed in 1932 growing wild at a roadside near 

 Picacho, Pinal County, but did not become established. Esch- 

 scholtzia calijornica Cham., the State flower of California, is a 

 deservedly popular annual in flower gardens and is usually known as 

 California-poppy. 



Key to the genera 



1. Flowers very irregular, one or both of the outer petals spurred at base, the 

 smaller inner petals united at apex and enclosing the anthers and stigma; 

 stamens 6; leaves decompound: Subfamily fumarioideae__5. Corydalis. 



1. Flowers regular, the petals all alike, separate; stamens numerous: Subfamily 



PAPAVEROIDEAE (2). 



2. Herbage, sepals, and capsules prickly; leaf blades large, sinuate-dentate or 

 sinuate-pinnatifid; sepals with hornlike appendages; stems leafy. 



3. Argemone. 

 2. Herbage, sepals, and capsules not prickly (or the leaves somewhat so in 

 Arctomecon) ; leaf blades not sinuate or pinnatifid; sepals not appendaged; 

 plants scapose or subscapose (3). 

 3. Fruit of several follicles, these becoming torulose or moniliform. 



1. Platystemon. 

 3. Fruit of a single capsule (4). 



4. Leaves compound, ternately dissected; sepals united into a conic 

 acuminate cap, this pushed off as the flower expands. 



2. ESCHSCHOLTZIA. 



4. Leaves simple; sepals not united into a cap 4. Arctomecon. 



1. PLATYSTEMON. Creamcups 



Plant annual; herbage pilose or subhirsute; leaf blades linear or 

 narrowly lanceolate, entire; flowers solitary, long-stalked; sepals 3; 

 petals 6, in 2 series, cream -colored ; pistils 6 or more, connivent or 

 coherent in a circle, separating in fruit; stigmas subulate-filiform. 



The peculiar fruits have been compared to tiny ears of corn with 

 the husks removed. 



1. Platystemon californicus Benth., Hort. Soc. London. Trans, ser. 2, 

 1: 405. 1835. 



Yavapai, Mohave, Gila, Maricopa, and Pima Counties, 1,500 to 

 4,300 feet, moist ground along streams, March to May. Southern 

 Utah, Arizona, and California. 



Several segregate species have been described by E. L. Greene 

 (Pittonia 5: 176, 190. 1903) of which the following are based on 

 Arizona types: P. arizonicus (type Pringle in 1882, Santa Catalina 



