164 UNITED STATES AND MEXICAN BOUNDARY. | | 
ASCLEPIAS TUBEROSA, Linn. Sp. p. 816; Decaisne, 4. с. Menos Texas, New Mexico and 
Sonora, June—July. 
ASCLEPIAS PARVIFLORA, Willd. Sp. 1, p. 1267? 了 avines head of Rock Creek, 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!" I 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 I cannot find that it differs in any other 
respects from the commoa A. parviflora, except that the flowers are about one-third larger. 
ASCLEPIAS VERTICILLATA, Linn. Sp. p. 315; Decaisne, l. c. A. linearis, Scheele in Linnea, 21, 
p. 158. Plains between Van Horne’s Wells and Muerte, July; Bigelow. Guadalupe river, 
Texas; Schott. 
Var. GALIOIDES, Decaisne, l. с. А. galioides, H В. К. Near San Eleeario, May; Parry. 
New Mexico and Sonora; common. (No. 1685, 1686 and 1689, Wright.) Our plant seems to be 
the same as Hartweg’s No. 216. 
ASCLEPIAS FASCICULARIS, Decaisne, 1. c. p. 569. A. macrophylla, Nutt. Pl. Gamb. in Journ. 
Acad. Se. Philad. (n. ser.) 1, p. 180. Grassy places near San Luis Rey, California, October, 1 
(in fruit); Parry. Variable in the breadth of the leaves. 
AsCLEPIAS LINARIA, Cav. Ic. 1, p. 42, t. 57, ex Decaisne, 1. c. p. 570. Sierra de Pajarito, 
Yanos, Sonora, May; Schott. Between Saltillo and San Luis Potosi; Berlandier (No. 1350) 
& Gregg (No. 562.) 
оет MACROTIS (п. 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. (Тав. XLV, B.) Rocky hills near 
| El Paso, and on the mountains below San Elceario, May—June ; Bigelow, Parry. (No. 1691, 
-一 一 Wright.) Stem about a span high intricately branched from the thick crooked base, which is 
somewhat ligneous, the branches terete. Leaves 1-13 inch long and half a line wide, revolute 
on the margin. Umbels 4-5-Ййожегей. ^ Peduncles 2-3 lines long; pedicels 4-5 lines. 
Segments of the calyx lanceclate. 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) LONGICORNU, Benth. Pl. Hariw. р. 24; Decaisne, 1. с. р. 570. А. Lindhei- 
meri, Engelm. & Gray, Pl. Lindh. 1, p. 42, (No. 272.) Plains and rocky places, New Mexico 
and western Texas, along the middle and lower Rio Grande, June—September, Borders of 
Aqua Fria river, Mexico; Gregg. (No. 1683, Wright.) 
> ASCLEPIAS SUBULATA, радас т с. р. 571; Torr. in Pacific Е. Road Expl. 6, p. 362, t. Ч 
3 Lower California, near the Mexican boundary line; Parry. Ravines and hills sides of the 
desert, near Fort Yuma, June; Schott. 
| Билл 1 MARITIMA, Decaisne in DC. Prodr. 8, p. 590. Cynanchum angustifolium, Pers. Syn. 
1, p. 214, Nutt. Gen. 1, p. 164. Saline marshes near the sea coast, western Texas; Wright. 
