[ 174 ] 94 



Polemonium cceruleum, (Linn., Hook.) Red Buttes on the Upper North fork of the Platte, hu- 

 mile, (Hook.) Highest parts of the mountains, near perpetual snow. August 13-15. 



Gllia (Cantua) hngiflora, (Torr.) Sand hills of the Platte. September 16. 



G. pulchella, (Dougl.) Upper part of the Sweet Water, near the mountains. August 7-20. 



G. inconspicua, (Dougl. ?) Goat island, Upper North fork of the Platte. July 30. This differs 

 from the Oregon plant in its fleshy, simply pinnatified leaves, with ovate, obtuse segments. 



CONVOLVULACE.E. 



Calystegia sepiurn, (R. Br) Forks of the Platte. July 2. 



Tpomcea leptophylla, n. sp. . Stems branching from the base, prostrate, glabrous, angular; leaves 

 lanceolate-linear, very acute, entire, attenuate at the base into a petiole; peduncles 1 to 3-flow- 

 ered; sepals roundish-ovate, obtuse with a minute mucro. — Forks of the Platte to Laramie 

 river. July 4-September 3. Imperfect specimens of this plant were collected about the sources of 

 the Canadian, by Dr. James, in Long's expedition; but they were not described in my account 

 of his plants. The root, according to Dr. James, is annual, producing numerous thick pros- 

 trate, but not twining stems, which are two feet or more in length. The leaves are from two 

 to four inches long, acute at each end, strongly veined and somewhat coriaceous. Peduncles 

 an inch or more in length; those towards the extremity of the branches only 1 flowered; the 

 lower ones bearing 2, 3, and sometimes 4 flowers, which are nearly the size of those of calys- 

 tegia sepiutn, and of a purplish color. Sepals appressed, about five lines long. Corolla cam- 

 panulate — funnel form, the tube much longer t ; an the calyx. Stamens inserted near the base 

 of the corolla; filaments villous at the base; anthers oblong linear, large. Style as long as the 

 stamens; stigma 2-lobed; the lobes capitate. Ovary 2-celled, with two ovules in each cell. 



SOLANACE^E. 



Nycterium luteum, (Donncat.) South fork of ihe Platte. July 4. 

 Physalis pubescent, (Willd.) Upper North fork of the Platte. July 23. 

 P. pumila, (Nutt.) With the preceding. 



GENTIANACEJ3. 



Gentiana arctnphila fj dtnsijlora, (Griseb. ? in Hook. Fl. Bor. Am. ii, page 61.) Sweet Water 

 of the Platte. August 4. 



G. ajfinis, (Griseb. ) North fork of the Platte. Septembers. 



G. pneumonanthe, (Linn.) Laramie river to Little Sandy creek, in the mountains. July 12- 

 August 8. 



G. Fremontii, n. sp. Stem branched at the base; branches 1-flovered; haves ovate, cuspidate, 

 cartilaginous on the margin, erect; corolla funnel-form; piicas email, slight y 2-tocthcd; cap- 

 sule ovate, at length entirely exserted on ita thkk stipe — vv ind river mountains — Ai nail. 

 Branches several, 2 to 3 inches long, or nearly equal length. Leaves a'ooul tar j>e lines long, with 

 a strong whitish cartilaginous border, shorter than the iiitemoacs. Flowers as large as thote 

 of G. proJr'du, pe tamerous. Calyx two-thirds the Lngth of the coroila; the t^-eth about one- 

 third the length of the tube. Plicae of the corolla scare, ly on^-ttiird as long as the lanceolate 

 lobes. Stamens included; anthers oblong, somewhat cordate at tha base. Capsule in matu- 

 rity, and after dehiscence, (in which state all our spe.imens were coileoei,) exserted quite be- 

 yond the corolla, and, with its long stipe, resembling a style with a large bi.a.n.-lbte stigma. 



' None of the capsules contained any seels. This species is nearly related to G. prustru-u, 

 (Haenk,) and G. humiLs, (Stev.,) but the former has spatulate oi.tuse recurved leaves, anJ the 

 latter entire plica;, which are nearly the length of tie corolla. In G. hum lit, an.: in the allied 

 G. squarrosa, (Ledeb.,) foe cap*ule is exserted after dischargi g the sejdk 



Sweriia perennis, obtus.i, (Hook.) From Laramie river to the Bi^ liutter. 

 Frasera speciosa, (Hook.) Defiles of the Wind river mountai s. August I -Ik 



Lisianikus RitstseLanus, (Hook.) Lower Platte to the forks. July-oeptemlxr. 



