315 [ 174 ] 



This new species belongs to the section Chylismia of Nutt. ( Torr. and 

 Gr. FL N. Jim. I, p. 506.) 



Oenothera deltoides. Torr. and Frem. 



Annual ; canescently strigose; stem low and stout; leaves rhombicovate. 

 repandly denticulate, acute ; flowers (large) clustered at the summit of the 

 short stem ; tube of the calyx nearly twice the length of the segments ; pe- 

 tals entire, one-third longer than the slightly declined stamens; anthers very- 

 long, fixed by the middle ; style exserted; capsules prismatic-cylindrical. 



Allied to (E. Jamesii, Torr. and Gr., and belongs, like that species, to 

 the section Eugenothera and sub-section Onagra. 



(Enothera canescens. Torr. and Frem. 



Strigosely canescent ; leaves narrowly lanceolate, rather obtuse, remote- 

 ly denticulate ; flowers in a leafy raceme ; tube of the calyx rather slen- 

 der, three times as long as -the ovary, and one -third longer than the seg- 

 ments ; petals broadly ovate, entire. 



This species was collected (we believe) on the upper waters of the Platte. 

 It belongs to the section Eucenothera, and to a sub-section which may be 

 called Gauropsis, and characterized as follows : Perennial diffuse herbs ; 

 tube of the calyx linear ; capsule obovate, sessile, with 4-winged angles 

 and no intermediate ribs, tardily opening ; seeds numerous, horizontal ; the 

 testa membranaceous ; leaves opaque. 



Besides these new species, many other (Enothera were collected ; among 

 which may be mentioned CE. albicaulis, alyssoides, montana, and Mis- 

 souriensis. Also, Gay ophy turn diffusum, (from the Snake country, grow- 

 ing about 2 feet high,) S'lenosiphon virgatum, and Gaura coccinea. 



Composite. 



The plants of this family were placed in the hands of Dr. Gray for ex- 

 amination ; and he has described some of them (including four new gen- 

 era) in the Boston Journal of Natural History for January, 1845. He has 

 since ascertained another new genus among the specimens ; and we fully 

 concur with him in the propriety of dedicating it to the late distinguished 

 I. N. Nicollet, Esq., who spent several years in exploring the country wa- 

 tered by the Mississippi and Missouri rivers, and who was employed by the 

 United States Government in a survey of the region lying between the 

 sources of those rivers. This gentleman exerted himself to make known 

 the botany of the country which he explored, and brought home with him 

 an interesting collection of plants, made under his direction, by Mr. Charles 

 Geyer, of which an account is given in the report of Mr. N. The follow- 

 ing is the description of this genus by Dr. Gray : 



Nicolletia. Gray. 



" Heads heterogamous, with few rays, many flowered. Involucre campan- 

 ulate, consisting of about S oval membranaceous scales in a single series ; the 

 base calyculate, with one or two smaller scales. Receptacle convex, alveo- 

 late. Corolla of the disk flowers equally 5-toothed. Branches of the style 

 terminated by a subulate hisped appendage. Achenia elongated, slender, 

 canescently pubescent. Pappus double, scarcely shorter than the corolla ; 

 the exterior of numerous scabrous, unequal bristles ; the inner of 5 linear- 



