^^^ UNITED STATES AND MEXICAN BOUND AEY. 



APOCYNACE.E. 



EcjiiTES Mj\CRosipnoN (n. sp.): caule erecto suffruticoso; ramis tomentosis; foliis ovatis acutis 

 vel acutiusculis brevissime petiolatis basi obtusis vel subcordatis 8upra piibescentibiis subtus 

 albo-tomentosis ; pedunculo terminali uni-(raro bi-) floro petiolo subduplo longiore ; lobis 

 calycinis lineari-lanceolatis ; corolla puberulae tubo calyce 6-8-ies longiore versus apicem 

 ventricoso, lobis obovatis. (Tab. XLIII.) Hills and drj rocty places along the Rio Grande, in 

 Texas and Chihuahua, August— September. (Nos. 556, 55Y, and 1664, Wright.) Plant 1-3 

 feet high, often a little branching at the summit. Leaves |-1| inch long, and |-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. 



(30-40) minute 



surrounding the base of the corolla. Corolla white, tinged with rose externally; the tube 3-5 



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Indies 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, Yery much 

 resembles E. hypoleuca, Bentli ; 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 (u. sp,) : caulc erecto suffruticoso, ramis puberulis ; foliis oblongis 

 ovatisve acutis utrinque pubescentibus subconcoloribus brevi-petiolatis ; pedunculis terminalibus 

 unifloris petiolo 5-plo longioribus ; lobis calycinis oblongis ; corollae tubo calyce 4-plo longiore 

 supra medium subventricoso, lobis obovatis. Arroyo de los Janos and San Bernardino, Sonora; 



Schott^ Thurher. (No. 1665, Wright.) Plant from a span to a 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 | of an inch long. Calyx 2| lines 



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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 the 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, Uinn. Sp. p. 311; Alph, DC. Prodr. 8, p. 439. Western Texas, f 



Sonora, and California. Broad and narrow leaved forms occur in all these places. 



Amsonta tomentosa, Tott. & Frem, in Frem. 2d Rep. p. 316, Sandy plains and ravines, 

 borders of the Rio Grande, Chihuahua, Sonora, &c , April — May. Stems about a foot and a 

 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 

 as in A. Tabern^montana, 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. A Tabern^emontana differs in the verj short lanceolate sepals, which 

 are scarcely one-fourth "the length of the tube of the corolla. 



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