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as in that plant, the inner cotyledon of the conduplicate embryo being abortive. It is wanting also in A. mellifera. In several species of this genus, if not in all of them, the filaments adhere throughout nearly their whole length to the tube of the perianth. The lobes of the perianth are dilated, and deejply emarginate, but appear ovate in the bud, from the lobules being conduplicate.
CHENOPODIACEiE."
Sarcobatus vermiculatus. S. Maximilioni, Nees in Prince Maxim. Trav., Engl. ed., p. 518. Frimontia vermicularis, Torr.inFrtm. 1st report, p. 96; and 2d report', p. 317. Batis vermicularis, Hook, fi. Bor. Am. 2, p. 188. Abundant on the Del Norte, and upper part of the valley of the Gila.
This is the pulpy thorn of Lewis and Clark. It has a very extensive range in the desert regions on both sides of the mountains. Since my notices of this plant were published in Fremont's reports, I have ascertained that Nees' description of his genus Sarcobatus dates a little anterior to mine, so that his name must be adopted.
Obione argentea, Moq. Atriplex argentea, Nutt. Abundant in sandy saline places on the Del Norte.
Oi polycarpa, n. sp.    Valley of the Gila.
Eurotia lanata, Moq. Valley of the Del Norte. A shrubby Sa-licornia, an Atriplex, and a species of Sueda, were found in saline soils along the Gila.
AMARANTHACEiE.
Amaeaethus hybridus', Var.1 Glabrous; stem and leaves nearly smooth, flowers (purplish) crowded in a dense compound terminal spike; bracts somewhat awned, shorter than the flowers; utricle opening transversely.    On the Del Norte, below Santa F6.
Alternaktheka'? (Endotheca) lanuginosa.—Achyranthes lan-uginosa, JVutt. in Am. Phil. Trans., (JY. Ser.,) 5, p. 166. Abundant on the sand hills above Socoro, along the Rio Del Norte. It spreads on the ground, forming patches, and rooting at the joints. The natives call it paga-paga. Nuttall referred this plant to Achyranthes, but it is clearly not of that genus. For the present, it is doubtfully placed in Alternanthera, but may hereafter be separated as a distinct genus. The flowers are in small axillary sessile clusters, and when the fruit is matured, they become imbedded in the branches by the growth of the surrounding parts, so as to be entirely concealed. The filaments are united into a cup at the base, and leave minute, entire, intermediate teeth. The anthers are two--celled before dehiscing, but afterwards one-celled, ovary, with a single ovule; style almost wanting; stigma globose. This plant was first discovered by Nuttall, on the north fork of the Canadian; Colonel Fremont collected it on the upper Arkansas in his last expedition; it has also been found in Texas by Mr. Wright and by Fendler and Dr. Gregg in New Mexico.