97 [ 174 3 



stem somewhat diffusely and trichotomously branched; leaves ovate -oblong; petiolate obtuse, entire; 

 staminate flowers on crowded axillary and terminal compound spikes. — Laramie river, North fork 

 of the Platte. September 3 — 11. — About a foot high. Fructiferous plant unknown. With 

 larger leaves. Forks of the Platte. July 2. This seems to be the same as the plant of Drum- 

 mond's Texan Collection, III, No. 266. 



SALICIACE.E. 



Salix longifolia, (Willd.) On the Platte. 



<$. Muhlenbergii, (Willd.) With the preceding. Several other species exist in the collection — . 



some from the Platte, others from the mountains; but I have had no time to determine thera 



satisfactorily. 

 Populns tremuloides, (Michx.) Lake in the Wind river mountains. 

 P. angustifolia, (Torr. in Ann. Lye. N. Hist, of New York, ii, p. 249.) Sweet Water river. 



Aug. 21. 

 P. monilifera, (Ait.) Lower Platte. 



ULMACE.E. 



Ulmus fulva, (Michx.) Lower Platte. 



Seltis crassi folia, (Nutt.) With the preceding. 



BETULACE^E. 



Betula glandulosa, (Michx.) On a lake in the Wind river mountains. Aug. 12-17. 

 B. occidentalism (Hook.) With the preceding. 



CONIFER.E. 



Pinus rigida, (Linn.) Lower Platte. Without cones. Leaves in threes, about 3 inches long. 

 jP. undetermined. Defiles of the Wind river mountains. Aug. 13-14. Between P. strobus and 



P. Lambertiana. Leaves in 5's, 1£ to 2 inches long, rigid. No cones. 

 P. (Abies) alba, (Michx.) With the preceding. 

 P. near balsamea. With the preceding. Leaves only. 

 Juniperus Virginiana, (Linn.) Lower Platte. 



ENDOGENOUS PLANTS. 



ALISMACE.E. 



Sagittaria sagittifolia, (Linn.) On the Kansas. 



ORCHIDACE^E. 



Platanthera leucophaea, (Lindl.) Black hills. July 27. 



P. hyperborea, (R. Br.) Laramie river to the Red Buttes. Aug. 26-31. 



Spiranthes cernua, (Rich.) Sweet Water river. Aug. 6. 



Aplectrum hyemale, (Nutt.) On the Platte. June 29. 



IRIDACEiE. 



Sisyrinchium anceps, (Linn.) North fork of the Platte. July 12. 



Iris Missouriensis, (Nutt., in Jour. Acad. Phil, vii, p. 58.) In fruit. Sweet Water river. Aug. 3, 

 Rhizoma very thick. Leaves narrow, rigid, as long as the scape. Scape nearly naked, 2- flow- 

 ered, terete, 10 inches high. Capsules oblong, obtusely triangular. Flowers not seen. 



7 



