458 CONTEIBUTIOlSrS FROM THE NATIONAL HEEBAElUM. 



5. PENIOCEREUS Britt. & Rose. 



1. Peniocereus greggii (Engelm.) Britt. & Rose, Contr. U. S. Nat. Herb. 12: 428, 

 1909. 



Cereus greggii Engelm. in Wisliz. Mem. North. Mex. 102. 1848. 



Type locality: "North and south of Chihuahua." 



Range: Southern New Mexico and Arizona to Chihuahua and Sonora. 



New Mexico: Tortugas Mountain {Mrs. E. 0. Wooton). Dry plains and hills, in 

 the Lower Sonoran Zone. 



Reported as collected somewhere in New Mexico in 1891 by W. H. Evans. 



This species is apparently rare. The stems are slender, 20 to 40 cm. high or more, 

 about 2 cm. in diameter, mostly 4-augled, with very small, stout spines 1 to 2 mm. 

 long from swollen bases. The plant usually has one or two ascending stems from a 

 large tuberous root. The flowers are about 15 cm. long, with a slender tube and white 

 funnelform perianth; they open at dusk and remain open only during the night. 



Order 36. THYMELAEALES. 



98. ELAEAGIfACEAE. Oleaster Family. 



Shrubs or trees with silvery lepidote or stellate pubescence; leaves opposite or 

 alternate, the blades entire; flowers perfect, polygamous, or dioecious, usually clus- 

 tered in the axils of the branches of the present or previous year; calyx of 4 or some- 

 times 2 sepals surmounting the hypanthium; petals wanting; stamens 4 or 8 on the 

 tube of the hypanthium; pistil simple, becoming a drupelike fruit. 



Elaeagnus angustifoUa, the oleaster, is cultivated in a number of places in the 

 State. It is especially attractive because of the sweet odor of its flowers. 



1. LEPARGYREA Raf. Buffalo berry 



KEY TO THE SPECIES. 



Leaves ovate or oval, green above; stems not spiny; low sln-ub 1. L. canadensis. 



Leaves oblong, silvery on both surfaces; stems spiny; tall treelike 



slirub 2. L. argentea. 



1. Lepargyrea canadensis (L.) Greene, Pittonia 2: 122. 1890. 

 Hippophae canadensis L. Sp. PI. 1024. 1753. 



Shepherdia canadensis Nutt. Gen. PI. 2: 240. 1818. 

 Type locality: "Habitat in Canada." 



Range: Alaska and Newfoundland to Oregon, New Mexico, and New York. 

 New Mexico : Brazos Canyon; Santa Fe Mountains. Damp woods, in the Canadian 

 Zone. 

 A low shrub less than a meter high, growing in deep damp woods. 



2. Lepargyrea argentea (Pursh) Greene, Pittonia 2: 122. 1890. 

 Hippophae argentea Pursh, Fl. Amer. Sept. 115, 1814. 

 Shepherdia argentea Nutt. Gen. PI. 2: 240. 1818. 



Type locality: "On the banks of the Missouri." 



Range: British America to Kansas and New Mexico. 



New Mexico: San Juan Valley. Along streams, in the Upper Sonoran Zone. 



A tall sln-ub, usually about 3 meters high, with small, silvery leaves. The small, 

 bright red berries are borne in great profusion. They have a pleasant acid flavor, 

 similar to that of red currants, and are gathered for making jellies. 



