153 UNITED STATES AND MEXICAN BOUNDARY. 
APOCYNACEJ. 
Еспттев MACROSIPHON (n. sp.): caule erecto suffruticoso; ramis tomentosis; foliis ovatis acutis 
vel acutiusculis brevissime petiolatis basi obtusis vel subcordatis supra pubescentibus subtus 
albo-tomentosis; pedunculo terminali uni-(raro bi-) floro petiolo subduplo longiore; lobis 
calycinis lineari-lanceolatis ; corolle puberule tubo calyce 6-8-іев longiore versus apicem 
ventricoso, lobis obovatis. (Tab. XLIII.) Hills and dry rocky places along the Rio Grande, in 
Texas and Chihuahua, August—September. (Nos. 556, 557, and 1664, Wright.) Plant 1-3 
feet high, often a little branching at the summit. Leaves 3-1 inch long, and 1-1 inch wide, 
often obtuse, but usually with a short abrupt point, the petioles scarcely more than a line in length. 
Flowers of a spicy odor. Calyx with numerous (80—40) minute subulate glands on the inside 
surrounding the base of the corolla. Corolla white, tinged with rose externally; the tube 8—5 
inches long, the upper part, for about an inch, 3 times the diameter of the lower portion, not 
. constricted at the throat, pubescent inside below the insertion of the stamens.  Nectary of 5 
unequal obtuse compressed distinct glands, which are about half the length of the ovary. 
Follicles about 3 inches long, very slender and tapering to a long point. Seeds oblong- 
linear ; testa wrinkled ; the coma at each end longer than the body of the seed. Very much 
resembles E. hypoleuca, Benth ; but that has longer peduncles, a velvety-pubescent corolla, the 
tube of which is only twice the length of the lobes and dilated about one-half its length as well 
as constricted at the orifice; also two of the glands of the nectary are connate. 
EcHITES BRACHYSIPHON (n. sp.): caule erecto suffruticoso, ramis puberulis; foliis oblongis 
ovatisve acutis utrinque pubescentibus subconcoloribus brevi-petiolatis ; pedunculis terminalibus 
unifloris petiolo 5-plo longioribus ; lobis calycinis oblongis ; corolle tubo calyce 4-plo longiore 
` supra medium subventricoso, lobis obovatis. Arroyo de los Janos and San Bernardino, Sonora; 
Schott, Thurber. (No. 1665, Wright.) Plant from a span to а foot high, more spreading than 
the preceding. Leaves about an inch long, sometimes smaller and oblong-lanceolate, the lower 
ones often obtuse, not white on the under side. Peduncles 2 of an inch long. Calyx 22 lines 
long, with about 20 minute subulate glands at the base. Corolla white; the tube an inch and a 
quarter long, the lower half much contracted. Nectary with two of ис glands united into one. 
This species also is related to E. hypoleuca, but that differs in the under part of the leaves being 
clothed with a dense white tomentum, and the segments of the calyx are much narrower as well 
as longer. 
ArOCYNUM CANNABINUM, Linn. Sp. p. 311; Alph. DC.’ Prodr. 8, р. 439. Western Texas, 
Sonora, and California. Broad and narrow leaved forms occur in all these places. 
AMSONIA TOMENTOSA, Torr. & Frém. in Frém. 2d Rep. р. 316. Sandy plains and ravines, 
borders of thé Rio Grande, Chihuahua, Sonora, ёс , April—May. Stems about a foot and а 
half high, several springing from a woody base. Leaves varying in breadth from linear to 
lanceolate, clothed with a short dense and more or less hoary pubescence. Flower about as large 
asin A. Tabernemontana, Walt. Pods 2-3 inches long and 2 lines in diameter, cylindrical, 
erect. A variety] or perhaps distinct species, occurs at Laguna Santa Maria, Chihuahua. It 
is glabrous; the flowers are considerably smaller, with the sepals glabrous and nearly as long 
as the tube of the corolla. In A. tomentosa the sepals are hairy and scarcely half as long as 
the tube of the corolla, А. Tabernemontana differs in the very short lanceolate sepals, which 
are scarcely one-fourth the length of the tube of the corolla. 
