Bibliography. 195 



We append a list of the principal species mentioned in this half of the 

 first volume, and when the remaining parts are before the public, will 

 take more extended notice of it as a whole. 



Oak. — Western oak, Quercus garryana; Holly-leaved oak, Q. agrifo- 

 lia; Small-leaved oak, Q. *dumosa; Rocky Mountain oak, Q. undulata; 

 Douglass oak, Q. Douglassi ; Dense-flowered oak, Q. densiflora; Lea's 

 oak, Q. Leana. 



Chestnut. — Dwarf chestnut, Castania alnifolia ; Golden-leaved 

 chestnut, C. chrysophylla. 



Birch. — Western birch, Betula occidentalis ; Oval-leaved birch, B. 

 rliombifolia. 



Alder. — Oregon alder, Alnus *Oregona; Thin-leaved alder, A. te- 

 nuifolia; Rhombic-leaved alder, A. rliombifolia; Sea-side alder, A. ma- 

 ritima. 



Elm. — Opaque-leaved elm, Uhnus *opaca; Thomas's elm, U. ra- 

 mosa. 



Hickory. — Small-fruited hickory, Gary a macrocarpa. 



Myrtle. — Inodorous candle-tree, Myrica inodora. 



Plane-tree. — California button-wood, Platanus ramosa. 



Poplar. — Narrow-leaved balsam poplar, Popidus angustifolia ; Cot- 

 ton-wood, P. IcBvigata. 



13. Choisy, de Convolvulaceis dissertatio tertia complectens Cuscutarum 

 hucusque cognitarum methodicam enumerationem et descriptionem, etc. (in 

 Memoires de la Societe de Physique et d'Histoire Naturelle de Geneve, 

 Vol. 9, part 2, (1841-42,) pp. 261-288,) with 5 plates.— This full and 

 finely illustrated monograph of a long neglected tribe of plants, is the 

 more interesting to us, at the present moment, since Dr. Engelmann has 

 been recently occupied in the study of the North American species, and 

 published the results of his observations in the last (October) number of 

 this Journal. Prof. Choisy describes thirty-eight species of Cuscuta 

 from actual examination, twenty of which he has handsomely figured. 

 Only four of this number are given as natives of extra-tropical North 

 America, (although five others are derived from Mexico and New Spain,) 

 viz. C. Californica, Chois. (California, Douglas,) and C. glomerata, C. 

 compacta, and C. Gronovii, all new species from the United States. These 

 species it is necessary to collate with those of Dr. Engelmann's mono- 

 graph, especially as the former have the priority in publication ; and we 

 find, accordingly, that — 



C. glomerata, Chois. I. c. p. 280, t. 4, f. 1 (St. Louis, Missouri, Riehl, 

 in herb. Renter) = Lepidanche Compositarum, Engelm. monogr. 



C. compacta, Chois. I. c. t. 4,f. 2 (Alabama, S. Carolina, &c.) = Le- 

 pidanche adpressa, Engelm. ined.; a species which has only recently fallen 

 under Dr. Engelmann's observation. 



