182 ME. NUTTALL'S DESCRIPTIONS OF NEW 



I have ventured, as I think on sufficient grounds, to separate the American from 

 the European hop. Found as it is, in the uncultivated interior of the continent, beyond 

 the reach of inhabitants, our plant must necessarily be indigenous. I have compared 

 the present with the foreign plant M^ith some attention, and I can in all cases readily 

 distinguish them by their foliage. In the American plant, whatever be the other 

 variations of the leaf, the attenuated ^pomts are denticulated nearly to the extremity. 

 In the European the summit of the leaf is abruptly toothed. In the native plant, the 

 male flowers appear to be smaller ; and the scales of the cone are likewise acuminate. 

 In some specimens, as in the European plant, the upper leaves are simply cordate, 

 and entire, but in all cases the denticulations are smaller, and more numerous. 



Mr. James Read, who has long ardently studied the botany of his own country, 

 after a distant voyage, has presented to the herbarium of the Academy of 

 Natural Sciences, among many other curious plants of China, a small male 

 specimen of the hop of that country, collected near Canton ; and this also appears to 

 be a form sufficiently distinct again from the European hop. From its strong 

 armature it might be called Humulus *aculeatus. The young stems and petioles are 

 very sharply aculeate ; the uppermost leaves are all palmate, five-lobed, and hairy 

 along the ribs ; the segments of the pubescent calyx are lanceolate. 



Hab. Throughout the United States in alluvial situations. I have also most 

 luxuriant specimens from the borders of streams in the Rocky Mountains, near 

 the line of New Mexico, collected by Dr. Gambel. 



PECTOCARYA. 



P. PENiciLLATA. Very common round Santa Barbara and other parts of 

 Upper California. Often scarcely distinguishable from P. chilensis, except by the 

 smaller fruit, the margin of which, as in P. chilensis, is not unfrequently pectinately 

 bristled the whole length ; they are all, therefore, little more than varieties of each 

 other. The plant I referred to Cijnoglossum pilosum, (Gen. Am. i. p. 114,) is a true 

 Mijosotis wholly distinct from either the present plant or that of Peru. More than 

 seven years back, I had formed a genus for this plant, (Staurina,) of which I 

 deposited specimens in the Herbarium of the Academy of Natural Sciences in 

 Philadelphia. In our plant, the stigma is capitellate and emarginate, the seed 

 cuneate-oblong, and the radicle inferior or pointing towards the style. 



MONARDA. 



M. *PECTiNATA. Biennial ? slightly pubescent ; leaves oblong-lanceolate, denticulate, shortly petiolate ; 

 capituli proliferous, rather small, subtended by herbaceous bracts, some of them purplish, ovate-acute, 

 strongly ciliated, as well as the elongated setaceous teeth of the calyx ; corolla widely ringent, the 

 tube scarcely exserted beyond the calyx. 



