95 [ 174 ] 



APOCYNACEJE. 



Apocynum cannabinum, (Linn.) On the Platte. 



ASCLEPIADACEJ3. 



Asclepias speciosa, (Torr, in Ann. Lye. N. York, ii, p. 218.— A Douglasii, Hook. PI. Bor.Am* 

 ii, p. 53, t. 142.) Forks of the Platte. July 2. Collected also by Mr Nicollet in his North- 

 western expedition. Hooker's plant differs in no essential characters from my A. speciosa, col- 

 lected by Dr. James in Long's first expedition. 



A vertici/lata, (Linn.) Small variety. With the preceding. 



A. tuberosa, (Linn.) Kansas river. June 19. 



Anantherix nitidis, (Nutt.) Big Blue river of the Kansas. June 20. 



Acerates long! folia, (Ell. ) Polyotus longifolia. (Nutt.) With the preceding. 



A. angustifolius. Polyotus angustifolius. (Nutt ) With the preceding. 



OLEACE.E. 

 Fraxinus platycarpa, (Michx. ) Leaves only. Lower Platte. 



PLANTAGINACEJE. 



Plantago eriopoda, (Torr., in Ann. Lye. N. York, ii, p. 237. ) Mouth of the Sweet Water. July 31, 

 P. gnaphaloides, (Nutt.) Little Blue river of the Kansas. June 24. 



CHENOPODIACE-E. 



Chenopodium zosUri folium, (Hook,) Platte. > 



C. album, (Linn.) North fork of the Platte. July 12. 



Ollonc canescens, (Mocq. Chenop., p. 74.) Atriplex canescens. (Nutt.) Upper North fork of 



the Platte. July 26. 

 Cyclohma plalyphylla, (Mocq., I. c. p. 18) Kochia dentata, (Willd.) North fork of the 



Platte. September 4. 

 Sueda marUima, (Mocq., 1. c. p. 127.) With the preceding. 

 Eurotia lanata, (Mocq., 1. c. p. 81.) Diotis lanata, (Pursh.) Red Buttes to the mountains. 



August 18-25. 

 Fremuniia, n. gen. Flowers diclinous, monoecious and ? dioicous, heteromorphous. Stam. FI. in 

 terminal aments. Scales eccentrically peltate, on a short stipe, angular, somewhat cuspidate up- 

 ward. Stamens 2, 3, and 4 under each scale, naked, sessile ; anthers oblong. Pist. Fl. solitary, 

 axillary. Peri~onium closely adhering to the lower half of the ovary, the border entire, nearly 

 obsolete, but in fruit enlarging into a broad horizontal angular and undulate wing. Ovary 

 ovate ; styles thick, divaricate ; stigmas linear. Fruit a utricle, the lower two-thirds covered 

 with the indurated calyx, compressed. Seed vertical ; integument double. Embryo fiat-spiral, 

 (2 to 3 turns,) green: radicle inferior; albumen none. 

 F. vemdculari*. (Batis? vermkularis, Hook.) Fl. Bor. Amer. ii, p. 128. Upper North fork of 

 the Platte, near the mouth of the Sweet Water. July 30. A low glabrous, diffusely branched 

 shrub, clothed with a whitish bark. Leaves alternate, linear, fleshy, and almost semiterete, 6 to 

 1 2 lines long and 1 to 2 lines wide. Staminate aments about three-fourths of an inch long, cyl- 

 indrical, at first dense, and composed of closely compacted angular scales, covering naked an- 

 thers. Anthers very deciduous. Fertile flowers in the axils of the rameal leaves. Calyx 

 closely adherent, and at first with only an obscure border or limb, but at length forming a wing 

 3 to 4 lines in diameter, resembling that of Salsola. This remarkable plant, which I dedicate to 

 Lieutenant Fremont, was first collected by Dr. James about the sources of the Canadian, (in 

 Long's expedition,) but it was omitted in my account of his plants, published in the Annals of 

 the Lyceum of Natural History. It is undoubtedly the batis> vermicularis of Hooker, (1. c.,) 

 collected on the harren grounds of the Oregon river by the late Mr. Douglas, who found it with 

 only the staminate flowers. We have it now from a third locality, so that the plant must b& 



