STANDLEY TKEES AND SHRUBS OF MEXICO. 299 



48. PAPAVERACEAE. Poppy Family. 



Shrubs or small trees with colored juice; leaves alternate, entire, dentate, 

 or lobate ; flowers perfect ; petals 4 or 6, sometimes none ; stamens numerous ; 

 fruit a 1-celled capsule. 



Herbaceous representatives of several other genera occur in Mexico. 



Leaves very spiny; sepals 3. Petals large, yellow 1. ABGEMONE. 



Leaves not spiny ; sepals 2. 



Petals large, yellow; leaves entire, coriaceous 2. DENDROMECON. 



Petals none; leaves lobed or dentate, membranaceous 3. BOCCONIA, 



1. ARGEMONE L. Sp. PL 508. 1753. 



1. Argemone fmticosa Thurb. ; A. Gray, Mem. Amer. Acad. n. ser. 5: 306. 

 1855. 



Coahuila ; type from La Pena. 



Shrub, 45 to 75 cm. high ; leaves 2.5 to 4 cm. long, sessile, shallowly lobed, 

 very glaucous, the lobes tipped with slender yellow spines ; flowers pale 

 yellow, 7 to 8 cm. broad. 



Several other species of the genus are found in Mexico, but they are all 

 herbs. They are known by the vernacular names " chicalote " and " cardo 

 santo." 



2. DENDROMECON Benth. Trans. Hort. Soc. Lond. II. 1: 407. 1884. 

 1. Dendromecon rigidum Benth. Trans. Hort. Soc. Lond. II. 1: 407. 1834. 



Northern Baja California. California. 



Shrub, 0.5 to 2.5 meters bigli ; leaves lanceolate or lance-elliptic, 3.5 to 7 cm. 

 long, acute, nearly sessile, very thick and conspicuously veined; flowers soli- 

 tary, terminal, 4 to 5 cm. broad ; capsule very slender, linear, about 6 cm. long. 



3. BOCCONIA L. Sp. PI. 505. 1753. 



Shrubs or small trees with yellow or reddish juice, the stems simple or 

 sparsely branched; leaves often very large; flowers small, in largo panicles; 

 capsule small, stipitate, dehiscent to the base; seeds solitary or few. 



In Mexican literature the species are much confused, since all are similar 

 in general appearance, and have the same properties. The following references 

 to the chemical properties of the plants may be cited : E. Armendilrez. Analisis 

 de la Bocconia, Estudio 4: 471 ; Mariano Lozano y Castro, Estudio qulmico de 

 la corteza de Bocconia, Estudio 4:281, 344; Villada, Estudios relativos a la 

 Bocconia arborea y los alcaloides de las Papaveraceas, Naturaleza II. 2: 207-212. 



Leaves entire or dentate 1. B. integrifolia. 



Leaves pinnatifid. 



Lobes of the leaves narrow, long-attenuate 2. B. arborea. 



Lobes broad, rounded or acute. 



Lobes acute or acutish, conspicuously dentate 3. B. frutescens. 



Lobes rounded at apex, entire or sinuate-dentate 4. B. latisepala. 



1. Bocconia integrifolia Humb. & Bonpl. PI. Aequin. 1: 119. pi. 35. 1808. 



Bocconia integrifolia mexicana DC. Reg. Veg. Syst. 2: 91. 1821. 



Veracruz. Central America to Peru (type locality) ; Jamaica. 



Branched shrub, 1 to 2 meters high ; leaves oblong or oblanceolate, 15 to 

 25 cm. long, tomentose beneath or glabrous and glaucous. 



