164 UNITED STATES AAD MEXICAN BOUNDAST. 



AscLEPiAS TUBEROSA; Linii, Sp.- p. 316; Becaisnej L c. Western TexaS; New Mexico and 

 Sonora, June — July. 



AscLEPiAS PARVJFLORA5 JViUd. Sp. I5 p. 1267? Ravines head of Rocli Creet^ western Texas, 

 July; Bigelow. (No. 1684, Wright.) Many years ago^ Prof. L. K, Gibbes, in his Catalogue 

 of the Plants of Columbia, South Carolina, {p. 11 ,) showed that the seeds of this species (at 

 least in his specimens) ^' want the usual comose appendage of the genus V^ J have verified his 



* 



observation in specimens from various parts of the southern States. In Dr. Bigelow's plant 

 the seeds are crowned with a tuft of hairs, and yet 1 cannot find that it differs in any other 



from 



Decaune. I. c. A, linearis, Scheele in Lmncea^ 21^ 



'p. Y58. Plains between Van Home's Wells and Muerte, July ; Bigeloiu. Guadalupe river, 



Texas ; Schott, ■ • 



Var. GALioiDES, Decaisne^ I, c. A. galioides, H B. K. Near San Elceario, May ; Parry, 



w 



New Mexico and Sonora; common. (No. 1685, 1686 and 1689, Wright.) Our plant seems to be 

 the same as Hartweg'8 No, 216. 



AscLEPiAS EASCICULAKI3, Decaisue^ ?. c, p, 569. A. macrophylla, Niilt. PL Garnh. in Journ. 

 Acad. Sc. Philad, (n. ser.) 1, p. 180. Grassy places near San Luis Eey, California, October, 

 (in fruit) ; Parry. Variable in the breadth of the leaves. 



AscLEPiAS LiNAEiA, Cav. Ic. 1, p. 42, t. 57, ex Decaisne^ I. c. p. 570. Sierra de Pajari^o, 

 Yanos, Sonora, May; Schott, Between Saltillo and San Luis Potosi ; Berlandier (No. 1350) 

 & Gregg (No. 562.) 



AscLEPiAS MACROTis (n. sp.): nana, suffruticosa; caule ramosissimo; ramulis rigidis unifariam 

 puberulis ; foliis oppositis anguste linearibus glabris mucronatis; pedunculis brevibus extra- 

 axillaribus paucifloris ; cucullis longissime lineari-attenuatis patulis margine pubescentibus ; 

 processu obtuso vix exserto ; gynostegio sessili brevissimo. (Tab, XLV, B.) Rocky hills near 

 El Paso, and on the mountains below San Elceario, May — June; Bigeloio^ Parry. (No. 1691^ 

 Wright,) Stem about a span high intricately branched from the thick crooked base, which is 

 somewhat ligneous, the branches terete. Leaves 1-1| inch long and half a line wide, revolute 

 on the margin. Umbels 4-5-flowered. Peduncles 2-3 lines long ; pedicels 4-5 lines. 

 Segments of the calyx lanceolate. Corolla pale purple ; the segments ovate and reflexed. 

 Hoods with an ovate base, their elongated tapering extremities diverging horizontally; the horn 

 slightly curved, short and obtuse, pubescent near the summit. Gynostegium very short, closely 

 sessile, anthers broader than long, with narrow cartilaginous margins. Pollen-masses elongated 

 pyriform. Pods oblong, lanceolate, acuminate, even. This very remarkable species has been 

 found only in the places mentioned above. It has much the appearance of Gomphocarpus 

 revolutus of South Africa. 



■ 



ASCLEPIAS (Otaria) lokgicohnu, Benth, PI, Harlio. p. 24; Becaisne. I. c, p. 570. A. Lindhei- 



Engelm 



272.) Plains and rocky places, New Mexico 



and western Texas, along the middle and lower Eio Grande, June — September. Borders of 

 Aqua Fria river, Mexico; Gregg. (No. 1683, Wright,) 



AscLEPiAS suBULATA, BecaisnCy I. c. p. 571; Torr. in Pacijic E. Road Expl, 6, p. 362, t. 7. 

 Lower California, near the Mexican boundary line; Parry. Ravines and hills sides of the 

 desert, near Fort Yuma, June ; Schott. 



Seutera makitima, Dtcaisne in DG. Prodr. 8,^. 590. Cynanchum angustifolium, Pers. Syn. 



74 



Saline marshes near the sea coast, western Texas ; Wright 



