180 UNITED STATES AND MEXICAN BOUNDARY. 



state from Key Westj collected bj Mr. Blodgett, and from 



it was found bj Dr. Eiddell. Even some of Berlandier's specie 



8clero23US^ are in the ordinary state of Amblogyna polygonoides. 



the vicinity of 'New Orleans, wliere 



Moqi 



MONTELI 



ed. 2, p, 370. Amarantus tamariscinus. Nutt. in 



(n ser.) 5, p. 165. Eavines Eio San Pedro, western "] 

 ted only the male plant ; while Wright (under No, 1747) 



em 



GUILLEMINEA DENSA, 31oq. I. C. p. 338, 



impio 



near the Copper Mines, July — August ; Bigeloiv. Sonora ; Thurher. On the banks of the 

 Colorado, California ; ScJiott. (Nos. 584, 585, and 1755, Wright.) Mr. Thurber's plant exactly 

 accords with the description of Moquin, 1. c. ; but our specimens from the other collections have 

 broader leaves. 



GossiPiANTHUs RiGiDiFLOEUS, Eoolc. Ic, PI. 3, t. 251 J Moq. I, c. f. 337. Western Texas. 

 (Wrighty Nos. 586 and 1754.) This plant occurs only in the collections of Mr. Wright. It is 

 certainly the same as Drummond's, on which the species was founded. We have no original 

 specimens of Gr. tenuiflorus for comparison, but we believe that it is not distinct from Gr, rigidiflorus. 

 In our Drummondian specimens of the latter, the plant is in fruit and the stamens are withered. 

 In the more complete ones of Mr. Wright the filaments are ovate-lanceolate, as they are described 

 in Gr. tenuiflorus ; and in both they are connate at the base. The relative length of the bracts 

 and calyx depends on the age of the flower. 



Ikesine VERMicuLARis, Moq. L c. p. 340. Illecebrum vermiculatum, Linn. Lower Eio Grrande, 

 in alluvial soils, October, SchotL 



Iresine diffusa, Hiimh. d Bonpl. in Willd. Sp. 4, p. 765 ; Moq. I. c, p. 345. Var. foliis ovato- 

 oblongis; splculis oblongis; calyce bracteis subduplo longiore'; staminodiis subulatis staminibus 

 alternantibus et triplo-brevioribus. Sonera and Chihuahua ; Thurher. San Estaban, Septem- 

 ber ; Bigelow. On the Eio Grande, near the Great Canon ; Parry, Perhaps not distinct from 

 I. celosioides, to which, indeed, some other species of the section Iresinastrum might be referred ; 

 but we have not found staminodia in any other of this group. 



All our specimens are female. No. 589, Wright, is the male plant, in which there are small 

 subulate staminodia between the filaments ; thus resembling Ireneis, of Moquin, a genus scarcely 

 distinct from Iresine. 



Alternanthera Achyrantha, p. Br. Prodr. p. 417 ; Moq. ?, c. p. 358. Achyranthes repens, 

 Linn. ; Ell. Sh, 1,^. 309. Banks of the Rio Pecos; Schott. Bachimba, Chihuahua; Thurher. 

 Matamoras ; Gregg. Moc^uin refers Elliott's plant to Telanthera polygonoides, but it certainly 

 belongs here. 



Alternanthera lanuginosa, Torr. in Emory Pep. p. 150; 3foq. L c. p. 359, (pro parte.) 

 Achyranthes lanuginosa, Nutt. in Amer. Phil. Trans, (n.. ser.) 5, p. 166. Common in New 

 Mexico and Sonora, flowering through the summer. (Nos. 591 and 1756, Wright; Nos. 726 

 and 727, Fendler; Nos. 835 and 2255, Berlandier.) In Emory's Eeport I noticed a remarkable 

 character in the specimens examined. The flowers become imbedded in the branches on which 

 they grow, so that when in fruit they are partly or wholly concealed ; on which account I pro- 

 posed to call it Endotheca. This character is, however, not constant, or is only seen in old 

 specimens. Sometimes the short branches, with the cluster of flowers at the summit subtended 

 by two or three leaves, will assume the appearance of a pedunculate head, furnished with an 

 involucre* The peduncle becomes thickened upward, as does likewise the confluent bases of the 

 leaves, involving more or less the flowers. In the young state the plant is densely woolly with 



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