116 NORTH AMERICAN FLOR [Volume 25 



1. Sericodes Greggii A. Gray, PI. Wright. 1 : 28. 1852. 

 A low shrub with much branched, short, crooked stem and gray cinereous bark ; leaves 

 linear or linear-spatulate, S-12 mm. long, acute, coriaceous, cinereous-strigose or hirsute ; 

 stipules setaceous, 1-3 mm. long, spiny, yellow, persistent on the short branches on which 

 the leaves are borne ; sepals 5 mm. long, lanceolate, acute, hirsute-strigose ; petals yellow- 

 ish, shorter than the sepals, elliptic or oval, acute; anthers nearly 2 mm. long; carpels 

 5-6 mm. long, lanceolate, densely silky-hirsute. 



Type locality : Near San Lorenzo, Chihuahua. 

 Distribution : Northern Mexico. 



10. PEGANUM L,. Sp. PI. 444. 1753. 



Herbs or undershrubs. Stems erect, glabrous or puberulous. Leaves alternate, entire 

 or irregularly pinnatifid. Stipules setaceous. Peduncles 1-flowered, opposite the leaves. 

 Sepals 4 or 5, linear, acute or obtuse and foliaceous and pinnatifid, persistent. Petals 

 4 or 5, spreading, subequal, entire, imbricate. Stamens 10-15, inserted at the base of the 

 annular or cup-shaped disc. Filaments slender, dilated at the base. Anthers linear. Ovary 

 2-3-lobed, globose, 2-3-celled, many-ovuled ; style rising from the center of the lobes, 

 somewhat twisted, 2-3-carinate above the middle, stigmatose. Fruit globose, 3-4-celled, 

 many-seeded. Seeds angled. Testa pitted ; embryo curved. 



Type species, Peganum Harmala L. 



1. Peganum mexicanum A. Gray, PI. Wright. 1 : 30. 1852. 



A simple or branched undershrub, from a deep lignescent base ; stems numerous, 1-3 



dm. long, at length decumbent, pubescent, becoming glabrate, often glaucescent ; leaves 



2-6 cm. long ; segments linear, acute : peduncles axillary ; sepals 4 or 5, foliaceous, lacini- 



ate-pinnatifid, acute ; petals narrowly oblong, yellow, shorter than the sepals ; stamens 



12-15 ; filaments scarcely dilated at the base, naked ; fruit dry and chartaceous, mostly 3- 



lobed ; seeds narrowly clavate-oblong, slightly curved ; testa membranaceous. 



Type locality : Saltillo, Coahuila. 



Distribution : Southwestern Texas, Coahuila, Chihuahua, and San Luis Potosi. 



