160 DNIIED STATES AND MEXICAN BOUNDARY. 



beak, which is somewhat longer than the erect anther-membrane. Pods not seen. We refer 

 this plant to Metastelma with much doubt, but there is no other genus to which it seems to he 

 more allied. It occurs also in Lindheimer's Texan Collection. 



EouLiOTA UNTFARiA, Encjehu. MS8. Gonolobus unifarius, SclieeU in Linnoea, 21, », 



loio. (Nos. 546 and 1672, Wright,) 



Gonolobus unifarius, Sclieele in Linncea, 21, p. 760. Shady 

 irn Texas and New Mexico, Julj— October ; ScJiott, Bige- 

 I fear that it is too near JR. Jacquini. 

 AcEKATES YiRiDiFLOEA, ELI. Sh. 1, p. 317 ; DecoAsne in DC. Prodr. 8, p. 522. Asclepias 

 viridiflora, Pursh, Fl. 1, p. 181. Western Texas ; Bigelow. No. 1693, Wright, is a variety 

 with broadly obovate and emarginate leaves. In my Flora of the Northern and Middle States 

 (2, p. 182) I incorrectly referred Asclepias obovata. Ell., to this variety ; a mistake which has 

 been copied by Decaisne. Elliott's plant is a genuine Asclepias; but A. obtusifolia /5, Torr., 

 also referred by Decaisne to A. obovata, is our A. Jamesii, described below. 



5. Anantherix decumbens, Nutt. I. c. p. 202. Valley of 



Decaisne 



April — August. 



AcERATES AURicuLATA {Engelm. 3IS8.): "caule erecto glabro ; foliis sparsis linearibus filifor- 

 mibus ; umbellis pluribus axillaribus multiflorus breviter pedunculatis ; pedicellis pilosis, calyce 

 extus villoso ; corollas laciniis reflexis ; cucullis gynostegio globoso sessili brevioribus apice 

 leviter tridentatis margine involutis basi latissime biauriculatis ; folliculis lanceolatis long-e 



rostratis brevibus." Dry ravines near the Copper Mines, and along the Mimbres, June — July; 

 Bigelow. Stem 2-3 feet high, somewhat glaucous. Leaves slightly scabrous on the margin, 

 which is not re volute, 4-6 inches long, J-| line (rarely as much as a line) wide. Pedicels 6 

 lines long. Lobes of the corolla 2| lines long. Horny wings of the anthers roundedj not 

 angular as in most Asclepiade^. Pollen-masses also, of an unusual shape, curved, nearly 

 equally wide, and obtuse at each end: remarkable, also, for the large triangular wings at the 

 sides of tlie hoods. Pods 3 or 4 inches long. Resembling A. angustifolia, but easily dis- 

 tinguished by the perfectly smooth stem and non-revolute leaves, but especially by the larger 

 flower, the peculiar structure of the cuculli, and the shape of the pollen-masses. This is No. 

 706 of Fendler's New Mexican Collection, and No, 1687 of Wright's. It was found also by 

 Fremont on the upper Arkansas. Doubtless it has often been confounded with A, angustifolia. 



) 



): albo-lanata; caule erecto simplici; foliis ovatis 



acutis sessilibus basi rotundatis v. cordato-amplexicaulibus ; umbellis sessilibus plurifloris; 

 gynostegio sessili ; cucullis suborbicularis saccatis apertis lateraliter compressis. (Tab. XLIY.) 

 Mountains east of San Diego, California, June; Parry. San Isabel, in the same State; Tliurher. 

 We have also specimens collected by the Eev. Mr. Fitch, in some part of California. Stem 2-3 

 feet high. Lower leaves 4-5 inches long, and nearly 3 inches wide, usually clasping at the 

 base. Umbels 3-4, in the axils of the upper leaves, 8-12-flowered; pedicels 1-1^ inch long, 

 very densely clothed with white wool. Flowers a third larger than in Asclepias Cornuti, *^ of 

 a chocolate-purple color.'' {Parry,) Petals ovate, reflexed, w^oolly externally. Hoods of the 

 crown nearly orbicular, spreading, without any trace of a spur, the margin of the orifice entire 

 and introflexed. The horny wings of the anthers almost rectangular at the base. Follicles 

 oblong-lanceolate, downy. This is a remarkable species, belonging rather to the subgenus 

 Anantherix than to Acerates proper. 



Sarcosiemma eilobum, Eoolc. <& Am, Bot. Beechey, p. 317. S. cynanchoides, Decaisne^ ?. c, 

 p. 540. S. Texanum, Engelm. MS8. Gonolobus cynanchoides, Engelm. & Gray^ PL Lindh. 1, 

 p. 43. Borders of the Eio Grande^ from Presidio del Norte to Eagle Pass, June— October ; 



