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P. Hoodii, (Richards.) North fork of the Platte. July 8.
P. pilosa, (Nutt.) Big Blue river of the Kansas. June 20.
Polemonium carruleum, (Linn., Hook.) Red Buttes on the Upper North fork of the Platte. 8 hu-
mile, (Hook.) Highest parts of the mountains, near perpetual snow. Aug. 13–15.
Gilia (Cantua) longiflora, (Torr.) Sand hills of the Platte, Sept. 16.
G. pulchella, (Dougl.) Upper part of the Sweet Water, near the mountains. Aug. 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.

CONVOLVULACEAE.

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

Ipomaa 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-flowered; sepals roundish-ovate, obtuse with a minute mucro.—Forks of the Platte to Laramie river, July 4–Sept. 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 prostrate, 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 calystegia sepium, and of a purplish color. Sepals appressed, about five lines long. Corolla campanulate—funnel form, the tube much longer than 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.

SOLANACEAE.

JN'ycterium luteum, (Donn cat.) South fork of the Platte, July 4. Physalis pubescens, (Willd.) Upper North fork of the Platte. July 23. P. pumila, (Nutt.) With the preceding. GENTIANACEAE. Gentiana arctophila 6 densiflora, (Griseb.? in Hook. Fl. Bor. Am. ii, p. 61.) Sweet Water of the Platte, Aug. 4. G. affinis, (Griseb.) North fork of the Platte. Sept. 9. G. pneumonanthe, (Linn.) Laramie river to Little Sandy creek, in the mountains. July 12– Aug. 8. G. Fremontii, n. sp. Stem branched at the base; branches 1-flowered ; leaves ovate, cuspidate, cartilaginous on the margin, erect; corolla funnel-form; plicae small, slightly 2-toothed; capsule ovate, at length entirely exserted on its thick stipe.—Wind river mountains.—Annual. Branches several, 2 to 3 inches long, of nearly equal length. Leaves about three lines long, with a strong whitish cartilaginous border, shorter than the internodes. Flowers as large as those of G. prostrata, pentamerous. Calyx two-thirds the length of the corolla; the teeth about onethird the length of the tube. Plica of the corolla scarcely one-third as long as the lanceolate lobes. Stamens included; anthers oblong, somewhat cordate at the base. Capsule in maturity, and after dehiscence (in which state all our specimens were collected) exserted quite beyond the corolla, and, with its long stipe, resembling a style with a large bilamellate stigma. None of the capsules contained any seeds. This species is nearly related to G. prostrata, (Haenk,) and G. humilis, (Stev.,) but the former has spatulate obtuse recurved leaves, and the latter entire plicae, which are nearly the length of the corolla. In G. humilis, and in the allied G. squarrosa, (Ledeb.,) the capsule is exserted after discharging the seeds. Swertia perennis, 3 obtusa, (Hook.) From Laramie river to the Big Buttes. Frasera speciosa, (Hook.) Defiles of the Wind river mountains. Aug. 13–14. Lisianthus Russelianus, (Hook.) Lower Platte to the forks. July–Sept.

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ASCLEPIADACEAE.

•Asclepias ‘peciosa, (Torr, in Ann. Lyc. N. York, ii, p. 218–4. Douglasii, Hook. Fl. 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,

collected by Dr. James in Long's first expedition. 4. terticillata, (Linn.) Small variety. With the preceding. -4. tuberosa, (Linn.) Kansas river. June 19. •onantherir tiridis, (Nutt.) Big Blue river of the Kansas. June 20. 4eerates longifolia, (Ell.) Polyotus longifolia. (Nutt.) With the preceding. 4. "gustifolius. Polyotus angustifolius. (Nutt.) With the preceding.

OLEACEAE. Frarious playcarpa, (Michx.) Leaves only. Lower Platte.

PLANTAGINACEAE.

Plantago triopoda, (Torr., in Ann. Lyc. N. York, ii, p. 237.) Mouth of the Sweet Water. July 31. P. gnaphaloides, (Nutt.) Little Blue river of the Kansas. June 24.

CHENOPODIACEAE.

Chenopodium zosterifolium, (Hook.) Platte?

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

Olione canescens, (Mocq: Chenop., p. 74.) Atriplex canescens. (Nutt.) Upper North fork of the Platte. July 26.

Cycloloma platyphylla, (Mocq, l.c. p. 18.) Kochia dentata, (Willd.) North fork of the Platte. Sept. 4.

Sueda maritima, (Mocq., l.c. p. 127.) With the preceding.

Eurotia lanata, (Mocq: 1. 3 p. 81.) Diotis lanata, (Pursh.) Red Buttes to the mountains. Aug. 18–25.

Fremontia, n. gen. Flowers diclinous, monarcious and dioicous, heteromorphous. Stam. Fl. in terminal aments. Scales eccentrically peltate, on a short stipe, angular, somewhat cuspidate upward. Stamens 2, 3, and 4 under each scale, naked, sessile; anthers oblong. Pist. Fl. solitary, axiliary. Perigonium 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 flat-spiral, (2 to 3 turns,) green; radicle inferior; albumen none.

F. termicularis. (Batis 7 vermicularis, 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 12 lines long and 1 to 2 lines wide. Staminate aments about three-fourths of an inch long, cylindrical, at first dense, and composed of closely compacted angular scales, covering naked anthers. 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, (l.c.,) collected on the barren 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 be widely diffused in the barren regions towards the Rocky mountains. It belongs to the suborder spirolobese of Meyer and Mocquin, but can hardly be referred to either the tribe suaedinae or to salsolar, differing from both in its diclinous heteromorphous flowers, and also from the latter in its flat-spiral, not cochleate embryo.

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Oxybuphus nyctaginea, (Torr. in James's Rocky Mountain Plants.) Calymenia nyctaginea, (Nutt.) Kansas river, June 20.

.Abronia mellifera, (Dougl.) North fork of the Platte, July 7–12.

.A. (tripterocalyr) micranthum, n. sp. Viscid and glandularly pubescent; leaves ovate, undulate, obtuse, acute at the base, petiolate; perianth funnel form, 4-lobed at the summit, 3 to 4 androus; achenium broadly 3-winged.—Near the mouth of Sweet Water river. August 1. Annual. Stem diffusely branched from the base, beginning to flower when only an inch high; the branches of the mature plant above a foot long. Leaves 1 to 1; inch in length; petioles about as long as the lamina. Heads axillary. Involucre 5-leaved, 8 to 14-flowered; leaflets ovate, acuminate. Perianth colored, (purplish,)3 to 4 lines long; lobes semi-ovate, obtuse. Stamens inserted in the middle of the tube, unequal; anthers ovate, sagittate at the base. Ovary oblong, clothed with the 3-winged base of the calyx; style filiform; stigma filiform-clavate, incurved. Mature achenium about 7 lines long and 4 wide; the wings broad, nearly equal, membranaceous and strongly reticulated. Seed oblong. Embryo conduplicate, involving the deeply 2-parted mealy albumen; radicle linear-terete; inner cotyledon abortive! outer one oblong, foliaceous, concave, as long as the radicle. This interesting plant differs from its congeners in its funnel-form perianth, 3 to 4 androus flowers, and broadly 3-winged fruit, but I have not been able to compare it critically with other species of abronia. It may prove to be a distinct genus.

POLYGONACEAE.

Polygonum Persicaria, (Linn.) North fork of the Platte. September 4.
P. aviculare, (Linn.) With the preceding.
P. amphibium, (Linn.) Sweet Water river. August 4.
P. viviparum, (Linn.) Black hills. July 26.
Rumer salicifolius, (Weinn.) With the preceding.
Oryria reniformis, (Hill.) Alpine region of the Wind river mountains. August 13–16.
Eriogonum ovalifolium, (Nutt.) Horse-shoe creek, Upper North fork of the Platte. July 22.
E. caespitosum, (Nutt.) With the preceding.
E. umbellatum, (Torr.,) in Ann, Lyc. Nat. Hist. N. York, ii, p. 241. Sweet Water river, Aug. 7.
E. Fremontii, n. sp. With the preceding.
E. annuum, (Nutt.) North fork of the Platte. September 4.

ELEAGNACEAE. Shepherdia argentea, (Nutt.) “Grains de bats.” Upper North fork of the Platte, from the Red Buttes to the mouth of the Sweet Water. August 24–28. S. Canadensis, (Nutt.) On a lake in the Wind river mountains. August 12–17. Eleagnus argenteus, (Pursh.) With the preceding.

EUPHORBIACEAE.

Euphorbia marginata, (Pursh.) Forks of the Platte. September 11.
E. polygonifolia, (Linn.) South fork of the Platte. July 4.
E. corollata, (Linn.) On the Kansas.
E. obtusata, (Pursh.) Little Blue river of the Kansas. July 23,
Pilinophytum capitalum, (Klotsch in Wiegem. Arch., April, 1842.) Croton capitatum, (Michx.)

Forks of the Platte.
Hendecanda' (CSch.,) multiflora, n. sp.; annual cane:cent, with stellate pubescence; dioecious;

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

SALICIACEAE.

Salix longifolia, (Willd.) On the Platte.

S. 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 them satisfactorily.

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

P. angustifolia, (Torr. in Ann. Lyc. N. Hist. of New York, ii, p. 249.) Sweet Water river. Aug. 21.

P. monilifera, (Ait.) Lower Platte.

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ULMACEAE.
Ulmus fulra, (Michx.) Lower Platte.
Celtis crassifolia, (Nutt.) With the preceding.

BETULACEAE.

Betula glandulosa, (Michx.) On a lake in the Wind river mountains. Aug. 12–17.
B. occidentalis, (Hook.) With the preceding.

coniFERAE.

Pinus rigida, (Linn.). Lower Platte. Without cones. Leaves in threes, about 3 inches long.
P. 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. (.1bies) alba, (Michx.) With the preceding.
P. near balsamea. With the preceding. Leaves only.
Juniperus Virginiana, (Linn.) Lower Platte.

ENDOGENOUS PLANTS.

ALISMACEAE. Sagittaria sagittifolia, (Linn.) On the Kansas.

ORCHIDACEAE.
Platanthera leucophaa, (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.
..?plectrum hyemale, (Nutt.) On the Platte. June 29. -

IRIDACEAE. 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-flowered, terete, 10 inches high. Capsules oblong, obtusely triangular, Flowers not seen. o

LILIACEAE. Yucca angustifolia, (Sims.) Laramie river. July 14. ..allium reticulatum, (Fras.) Defiles in the Wind river mountains. Aug. 12–17. Similacina stellata, (Desf.) From the Laramie river to the Red Buttes. Aug. 26–31.

- MELANTHACEAE. Zigadenus glaucus, (Nutt.) Sweet Water river. Aug.

JUNCACEAE.
Juncus echinatus, (Muhl.) North fork of the Platte. Sept. 4.

COMMELYNACEAE.
Tradescantia Virginica, (Linn.,) and a narrow-leaved variety. Kansas and Platte.

CYPERACEAE.
Carer festucacea, (Schk.) On the Kansas. June.
C. aurea, (Nutt.) Little Blue river of the Kansas. June 22.
C. panicea, (Linn.) Alpine region of the Wind river mountains, near perpetual snow. Aug. 15.
C. atrata, (Linn.) With the preceding.

GRAMINEAE.

Spartina cynosuroides, (Willd.) Little Blue river of the Kansas. June 22.
.Aristida pallens, (Pursh.) On the Platte. June 29.
...Agrostis Michauriana, (Trin.) Little Blue river of the Kansas. June 23.
Phleum alpinum, (Linn.) Alpine region of the Wind river mountains. Aug. 13–14.
Bromus ciliatus, (Linn ) On the Platte. June–Aug.
Festuca orina, (Linn.) Alpine region of the Wind river mountains. Aug. 13–14.
Festuca mutans, (Willd.) On the Kansas.
Poa lara, (Haenke.) With the preceding.
P. crocata, (Michx. 2) With the preceding. Spikelets 2-flowered.
P. nervata, (Willd.) On the Kansas.
Koeleria cristata, (Pers.) Big Blue river of the Kansas, and on the Platte as high as Laramie

river. June 20–July 22.
Deschampsia ca’spitosa, (Beauv.) Alpine region of the Wind river mountains. Aug. 13–14.
..Andropogon scoparius, (Michx.) Lower Platte.
.A. mutans, (Linn.) Laramie river, North fork of the Platte. Sept. 3–4.
Hordeum jubatum, (Ait.) Forks of the Platte. July-2.
Elymus Virginicus, (Linn.) Big Blue river of the Kansas. June 20.
E. Canadensis, (Linn.) Little Blue river of the Kansas. June 22.
Beckmannia cruciformis, (Jacq.) North fork of the Platte. July 22.

EQUISETACEAE.
Equisetum arrense, (Linn.) On a lake in the Wind river mountains. Aug. 12-17.

FILICES.

Hypopeltis obtusa, (Torr. Compend. Bot. N. States, p. 380, 1826.) Aspidium obtusum, (Willd.) Woodsia Perriniana, (Hook, and Grey. Icon. Fil. I, t, 68.) Physematium (Kaulf) obtusum, (Hook. Fl. Bor. Am. ii, p. 259.) On the Platte,

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